Revised Ghent nosology.
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More than half of the publishers listed alongside IntechOpen (18 out of 30) are Social Science and Humanities publishers. IntechOpen is an exception to this as a leader in not only Open Access content but Open Access content across all scientific disciplines, including Physical Sciences, Engineering and Technology, Health Sciences, Life Science, and Social Sciences and Humanities.
\\n\\nOur breakdown of titles published demonstrates this with 47% PET, 31% HS, 18% LS, and 4% SSH books published.
\\n\\n“Even though ItechOpen has shown the potential of sci-tech books using an OA approach,” other publishers “have shown little interest in OA books.”
\\n\\nAdditionally, each book published by IntechOpen contains original content and research findings.
\\n\\nWe are honored to be among such prestigious publishers and we hope to continue to spearhead that growth in our quest to promote Open Access as a true pioneer in OA book publishing.
\\n\\n\\n\\n
\\n"}]',published:!0,mainMedia:{caption:"IntechOpen Maintains",originalUrl:"/media/original/113"}},components:[{type:"htmlEditorComponent",content:'
Simba Information has released its Open Access Book Publishing 2020 - 2024 report and has again identified IntechOpen as the world’s largest Open Access book publisher by title count.
\n\nSimba Information is a leading provider for market intelligence and forecasts in the media and publishing industry. The report, published every year, provides an overview and financial outlook for the global professional e-book publishing market.
\n\nIntechOpen, De Gruyter, and Frontiers are the largest OA book publishers by title count, with IntechOpen coming in at first place with 5,101 OA books published, a good 1,782 titles ahead of the nearest competitor.
\n\nSince the first Open Access Book Publishing report published in 2016, IntechOpen has held the top stop each year.
\n\n\n\nMore than half of the publishers listed alongside IntechOpen (18 out of 30) are Social Science and Humanities publishers. IntechOpen is an exception to this as a leader in not only Open Access content but Open Access content across all scientific disciplines, including Physical Sciences, Engineering and Technology, Health Sciences, Life Science, and Social Sciences and Humanities.
\n\nOur breakdown of titles published demonstrates this with 47% PET, 31% HS, 18% LS, and 4% SSH books published.
\n\n“Even though ItechOpen has shown the potential of sci-tech books using an OA approach,” other publishers “have shown little interest in OA books.”
\n\nAdditionally, each book published by IntechOpen contains original content and research findings.
\n\nWe are honored to be among such prestigious publishers and we hope to continue to spearhead that growth in our quest to promote Open Access as a true pioneer in OA book publishing.
\n\n\n\n
\n'}],latestNews:[{slug:"intechopen-supports-asapbio-s-new-initiative-publish-your-reviews-20220729",title:"IntechOpen Supports ASAPbio’s New Initiative Publish Your Reviews"},{slug:"webinar-introduction-to-open-science-wednesday-18-may-1-pm-cest-20220518",title:"Webinar: Introduction to Open Science | Wednesday 18 May, 1 PM CEST"},{slug:"step-in-the-right-direction-intechopen-launches-a-portfolio-of-open-science-journals-20220414",title:"Step in the Right Direction: IntechOpen Launches a Portfolio of Open Science Journals"},{slug:"let-s-meet-at-london-book-fair-5-7-april-2022-olympia-london-20220321",title:"Let’s meet at London Book Fair, 5-7 April 2022, Olympia London"},{slug:"50-books-published-as-part-of-intechopen-and-knowledge-unlatched-ku-collaboration-20220316",title:"50 Books published as part of IntechOpen and Knowledge Unlatched (KU) Collaboration"},{slug:"intechopen-joins-the-united-nations-sustainable-development-goals-publishers-compact-20221702",title:"IntechOpen joins the United Nations Sustainable Development Goals Publishers Compact"},{slug:"intechopen-signs-exclusive-representation-agreement-with-lsr-libros-servicios-y-representaciones-s-a-de-c-v-20211123",title:"IntechOpen Signs Exclusive Representation Agreement with LSR Libros Servicios y Representaciones S.A. de C.V"},{slug:"intechopen-expands-partnership-with-research4life-20211110",title:"IntechOpen Expands Partnership with Research4Life"}]},book:{item:{type:"book",id:"6025",leadTitle:null,fullTitle:"Temporomandibular Joint Pathology - Current Approaches and Understanding",title:"Temporomandibular Joint Pathology",subtitle:"Current Approaches and Understanding",reviewType:"peer-reviewed",abstract:"Dental practitioners face a large number of patients seeking help for pain and loss of function in their temporomandibular joint and related structures. This book consists of eight chapters by authors who would like to share their experiences and researches on pathological conditions related to the temporomandibular joint. The chapters mainly focus on disorders, diseases, and entities while shedding light on the diagnostic methods and management modalities.",isbn:"978-953-51-3862-4",printIsbn:"978-953-51-3861-7",pdfIsbn:"978-953-51-4017-7",doi:"10.5772/67019",price:119,priceEur:129,priceUsd:155,slug:"temporomandibular-joint-pathology-current-approaches-and-understanding",numberOfPages:208,isOpenForSubmission:!1,isInWos:null,isInBkci:!1,hash:"6663d492aea23855b9fdcf753089981e",bookSignature:"Yusuf Emes, Buket Aybar and Gühan Dergin",publishedDate:"February 28th 2018",coverURL:"https://cdn.intechopen.com/books/images_new/6025.jpg",numberOfDownloads:21028,numberOfWosCitations:5,numberOfCrossrefCitations:12,numberOfCrossrefCitationsByBook:1,numberOfDimensionsCitations:20,numberOfDimensionsCitationsByBook:1,hasAltmetrics:1,numberOfTotalCitations:37,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"November 28th 2016",dateEndSecondStepPublish:"December 19th 2016",dateEndThirdStepPublish:"July 20th 2017",dateEndFourthStepPublish:"August 20th 2017",dateEndFifthStepPublish:"October 20th 2017",currentStepOfPublishingProcess:5,indexedIn:"1,2,3,4,5,6",editedByType:"Edited by",kuFlag:!1,featuredMarkup:null,editors:[{id:"178414",title:"Prof.",name:"Yusuf",middleName:null,surname:"Emes",slug:"yusuf-emes",fullName:"Yusuf Emes",profilePictureURL:"https://mts.intechopen.com/storage/users/178414/images/6953_n.jpg",biography:"Born in Istanbul in 1974, Dr. Emes graduated from Istanbul University Faculty of Dentistry in 1997 and completed his PhD degree in Istanbul University faculty of Dentistry Department of Oral and Maxillofacial Surgery in 2005. He has papers published in international and national scientific journals, including research articles on implantology, oroantral fistulas, odontogenic cysts, and temporomandibular disorders. Dr. Emes is currently working as a full-time academic staff in Istanbul University faculty of Dentistry Department of Oral and Maxillofacial Surgery.",institutionString:null,position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"3",totalChapterViews:"0",totalEditedBooks:"1",institution:{name:"Istanbul University",institutionURL:null,country:{name:"Turkey"}}}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,coeditorOne:{id:"178412",title:"Associate Prof.",name:"Guhan",middleName:null,surname:"Dergin",slug:"guhan-dergin",fullName:"Guhan Dergin",profilePictureURL:"https://mts.intechopen.com/storage/users/178412/images/6954_n.jpg",biography:"Assoc. Prof. Dr. Gühan Dergin was born in 1973 in Izmit. He graduated from Marmara University Faculty of Dentistry in 1999. He completed his specialty of OMFS surgery in Marmara University Faculty of Dentistry and obtained his PhD degree in 2006. In 2005, he was invited as a visiting doctor in the Oral and Maxillofacial Surgery Department of the University of North Carolina, USA, where he went on a scholarship. Dr. Dergin still continues his academic career as an associate professor in Marmara University Faculty of Dentistry. He has many articles in international and national scientific journals and chapters in books.",institutionString:null,position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"2",totalChapterViews:"0",totalEditedBooks:"0",institution:{name:"Marmara University",institutionURL:null,country:{name:"Turkey"}}},coeditorTwo:{id:"202198",title:"Dr.",name:"Buket",middleName:null,surname:"Aybar",slug:"buket-aybar",fullName:"Buket Aybar",profilePictureURL:"https://mts.intechopen.com/storage/users/202198/images/6955_n.jpg",biography:"Buket Aybar, DDS, PhD, was born in 1971. She graduated from Istanbul University, Faculty of Dentistry, in 1992 and completed her PhD degree on Oral and Maxillofacial Surgery in Istanbul University in 1997.\r\nDr. Aybar is currently a full-time professor in Istanbul University, Faculty of Dentistry Department of Oral and Maxillofacial Surgery. She has teaching responsibilities in graduate and postgraduate programs. Her clinical practice includes mainly dentoalveolar surgery.\r\nHer topics of interest are biomaterials science and cell culture studies. She has many articles in international and national scientific journals and chapters in books; she also has participated in several scientific projects supported by Istanbul University Research fund.",institutionString:null,position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"1",totalChapterViews:"0",totalEditedBooks:"0",institution:{name:"Marmara University",institutionURL:null,country:{name:"Turkey"}}},coeditorThree:null,coeditorFour:null,coeditorFive:null,topics:[{id:"1397",title:"Arthropathology",slug:"arthropathology"}],chapters:[{id:"59082",title:"Introductory Chapter: Optimizing the Management Outcomes in Patients with Temporomandibular Disorder",doi:"10.5772/intechopen.73537",slug:"introductory-chapter-optimizing-the-management-outcomes-in-patients-with-temporomandibular-disorder",totalDownloads:973,totalCrossrefCites:0,totalDimensionsCites:0,hasAltmetrics:0,abstract:null,signatures:"Buket Aybar, Yusuf Emes and Guhan Dergin",downloadPdfUrl:"/chapter/pdf-download/59082",previewPdfUrl:"/chapter/pdf-preview/59082",authors:[{id:"178414",title:"Prof.",name:"Yusuf",surname:"Emes",slug:"yusuf-emes",fullName:"Yusuf Emes"}],corrections:null},{id:"58412",title:"Myofascial Pain Dysfunction Syndrome: Etiology, Diagnosis, and Treatment",doi:"10.5772/intechopen.72529",slug:"myofascial-pain-dysfunction-syndrome-etiology-diagnosis-and-treatment",totalDownloads:2044,totalCrossrefCites:3,totalDimensionsCites:4,hasAltmetrics:0,abstract:"Myofascial pain dysfunction syndrome (MPDS) is a stomatognathic system disturbance, which consists of pain, jaw movement irregularities, and muscle spasm. Hyperexcitation of peripheral sensory neurons causes a reaction of induction in the motor neuron and then spasms of the masticatory muscles follow. Long-term spasm causes muscular pain and irregular mandibular motion. Pain is the most important inducer and therefore must be managed firstly in order to manage the muscle spasms. Symptomatic treatment approaches may be useful, but after symptom elimination, etiologically based treatment must be provided to the patient. The neurophysiology of the stomatognathic system must be well understood to determine a proper treatment for the MPDS condition. Both symptomatic and etiological treatment methods have been proposed by differing authors as potential solutions for MPDS. Occlusal splints are a commonly used treatment for relieving MPDS symptoms. Alternatively, some forms of occlusal adjustment (not all) have been shown to be an effective, permanent treatment course for myofascial pain dysfunction syndrome. This chapter describes the neural controls over the stomatognathic system and how that system can neurologically promote the MPDS disease state. It then details the computer-guided MPDS occlusal adjustment treatment known as disclusion time reduction that has been shown in many published studies to be a highly effective myofascial pain dysfunction syndrome (MPDS) therapy.",signatures:"Serdar Gözler",downloadPdfUrl:"/chapter/pdf-download/58412",previewPdfUrl:"/chapter/pdf-preview/58412",authors:[{id:"204606",title:"Dr.",name:"Serdar",surname:"Gözler",slug:"serdar-gozler",fullName:"Serdar Gözler"}],corrections:null},{id:"58358",title:"Internal Derangements of the Temporomandibular Joint: Diagnosis and Management",doi:"10.5772/intechopen.72585",slug:"internal-derangements-of-the-temporomandibular-joint-diagnosis-and-management",totalDownloads:3346,totalCrossrefCites:3,totalDimensionsCites:5,hasAltmetrics:1,abstract:"Millions of individuals worldwide suffer from temporomandibular joint (TMJ) disorders and are characterized by pain and joint dysfunction. TMJ internal derangement (ID) is the most frequent type of temporomandibular disorders (TMDs). The ID of TMJ is defined as a joint dysfunction associated with an abnormal disc position. Identification and elimination of the causes of tissue breakdown of the TMJ that lead to ID are the key factors for successful treatment. The common causes for TMJ ID are trauma and parafunctional habits which lead to joint overload and degenerative changes in the articular structures, increased friction, and gradual disc displacement. Local and systemic inflammatory/degenerative arthropathies may also affect TMJ and cause ID. The aim of this chapter is to give comprehensive knowledge about the contemporary perspective of TMJ ID including diagnostic and therapeutic developments and innovations. Clinicians should establish the correct diagnosis and cause of the disease for appropriate management so that patients do not suffer from ineffective treatments. As an innovative development, TMJ replacements with alloplastic joint prosthesis and tissue-engineered structures hold promise for the future of management of TMJ ID.",signatures:"Ufuk Tatli and Vladimir Machon",downloadPdfUrl:"/chapter/pdf-download/58358",previewPdfUrl:"/chapter/pdf-preview/58358",authors:[{id:"203864",title:"Associate Prof.",name:"Ufuk",surname:"Tatli",slug:"ufuk-tatli",fullName:"Ufuk Tatli"},{id:"204401",title:"Dr.",name:"Vladimir",surname:"Machon",slug:"vladimir-machon",fullName:"Vladimir Machon"}],corrections:null},{id:"58657",title:"Osteoarthritis of the Temporomandibular Joint: Clinical and Imagenological Diagnosis, Pathogenic Role of the Immuno- Inflammatory Response, and Immunotherapeutic Strategies Based on T Regulatory Lymphocytes",doi:"10.5772/intechopen.72496",slug:"osteoarthritis-of-the-temporomandibular-joint-clinical-and-imagenological-diagnosis-pathogenic-role-",totalDownloads:2274,totalCrossrefCites:1,totalDimensionsCites:2,hasAltmetrics:0,abstract:"Osteoarthritis is a degenerative disease affecting the TMJ. It is the most common TMJ disorder and shows a higher prevalence in women and older people. TMJ osteoarthritis (TMJ-OA) is characterized by variable degrees of inflammation, destruction of the articular cartilage, and sub-chondral bone resorption. In this context, diverse pro-inflammatory cytokines, chemokines, enzymes, and bone-resorptive associated factors have been considered as possible markers of active TMJ-OA. The molecular balance is determinant not only for initiation and progression, but also for the clinical expression of the disease. Recent advances in the biochemical analysis of synovial fluid from affected patients have provided new insights into the patho-physiology of the TMJ-OA; however, its molecular pathogenesis still remains unclear. Recently, a Th1 and Th17-dominated immune response has been associated with the inflammatory and destructive events characteristic of TMJ-OA and, in particular, the Th17 lymphocyte pathway has a pivotal role in the increased production of RANKL, which is involved in osteoclast activation and subsequent sub-chondral bone resorption. Understanding the TMJ physiology and pathogenesis of the TMJ-OA, together with the key molecular determinants of the TMJ tissue destruction, will enable the development of new chair-side point of care diagnostics and more conservative treatment modalities with minimal complications.",signatures:"Gustavo Monasterio, Francisca Castillo, Daniel Betancur, Arnoldo\nHernández, Guillermo Flores, Walter Díaz, Marcela Hernández and\nRolando Vernal",downloadPdfUrl:"/chapter/pdf-download/58657",previewPdfUrl:"/chapter/pdf-preview/58657",authors:[{id:"92267",title:"Dr.",name:"Marcela",surname:"Hernández",slug:"marcela-hernandez",fullName:"Marcela Hernández"},{id:"96397",title:"Dr.",name:"Rolando",surname:"Vernal",slug:"rolando-vernal",fullName:"Rolando Vernal"},{id:"199490",title:"Dr.",name:"Gustavo",surname:"Monasterio",slug:"gustavo-monasterio",fullName:"Gustavo Monasterio"},{id:"199493",title:"Dr.",name:"Arnoldo",surname:"Hernández",slug:"arnoldo-hernandez",fullName:"Arnoldo Hernández"},{id:"199494",title:"Dr.",name:"Guillermo",surname:"Flores",slug:"guillermo-flores",fullName:"Guillermo Flores"},{id:"199495",title:"Dr.",name:"Walter",surname:"Díaz",slug:"walter-diaz",fullName:"Walter Díaz"},{id:"203984",title:"Dr.",name:"Daniel",surname:"Betancur",slug:"daniel-betancur",fullName:"Daniel Betancur"},{id:"221501",title:"Dr.",name:"Francisca",surname:"Castillo",slug:"francisca-castillo",fullName:"Francisca Castillo"}],corrections:null},{id:"58184",title:"Benign Tumors of Temporomandibular Joint",doi:"10.5772/intechopen.72302",slug:"benign-tumors-of-temporomandibular-joint",totalDownloads:2110,totalCrossrefCites:1,totalDimensionsCites:4,hasAltmetrics:0,abstract:"The temporomandibular joint (TMJ) forms a complex functional system with teeth, bones, connected muscles and ligaments. Any discomfort in any of these structures directly affects the joint. The complaints are mostly pain, malocclusion and swelling. Temporomandibular joint tumors are very uncommon but show symptoms similar to intra-articular disorders that make up most of these disorders. The most common TMJ-specific benign tumors are classified after a brief literature review. Our classification also includes the osteoma of the TMJ, other than World Health Organization’s (WHO) classification of soft tissue and bone tumors. This benign tumor was also included in the classification because of its higher frequency in the literature. The treatment of these neoplasms may be conservative or radical surgery.",signatures:"Mehmet Emre Yurttutan, Ayşegül Tüzüner Öncül and Hakan Alpay\nKarasu",downloadPdfUrl:"/chapter/pdf-download/58184",previewPdfUrl:"/chapter/pdf-preview/58184",authors:[{id:"178706",title:"Dr.",name:"Aysegul",surname:"Tuzuner Oncul",slug:"aysegul-tuzuner-oncul",fullName:"Aysegul Tuzuner Oncul"},{id:"213436",title:"Dr.",name:"Mehmet Emre",surname:"Yurttutan",slug:"mehmet-emre-yurttutan",fullName:"Mehmet Emre Yurttutan"},{id:"213439",title:"Prof.",name:"Hakan Alpay",surname:"Karasu",slug:"hakan-alpay-karasu",fullName:"Hakan Alpay Karasu"}],corrections:null},{id:"59089",title:"JVA, Mastication and Digital Occlusal Analysis in Diagnosis and Treatment of Temporomandibular Disorders",doi:"10.5772/intechopen.72528",slug:"jva-mastication-and-digital-occlusal-analysis-in-diagnosis-and-treatment-of-temporomandibular-disord",totalDownloads:1597,totalCrossrefCites:1,totalDimensionsCites:1,hasAltmetrics:0,abstract:"Temporomandibular joint disorder (TMJ) is a complex and multifactorial functional disorder. Best approach in the treatment of TMJ disorders needs in detail proper diagnostic study. Joint vibration analysis (JVA) device, a new age technology and one of the most important diagnostic tools, is used for detecting intra-articular sound vibrations. Every type of vibration in different frequencies shows us the status of joint. Evaluation can be made after analyzing the results applying to a diagram. Like Combining of the sound vibration diagnostic techniques with other examination methods may be very meaningful in efforts of treating TMJ problems. Another diagnosis method is the evaluation of chewing movements. Best chewing efficiency is the most important purpose of masticatory system. Final product is a very important indicator for the efficiency of the mastication, and chewing pattern. T-Scan digital occlusal analyzing system is another important occlusal diagnostic instrument. Digital occlusal analysis system is currently the most powerful method of TMD clinics for treatment of patients with muscle pain dysfunction syndrome. Digital occlusal analysis system allows us to perform the MPDS treatments, splint and occlusal rehabilitation. The three important diagnostic systems are described in this chapter.",signatures:"Serdar Gözler",downloadPdfUrl:"/chapter/pdf-download/59089",previewPdfUrl:"/chapter/pdf-preview/59089",authors:[{id:"204606",title:"Dr.",name:"Serdar",surname:"Gözler",slug:"serdar-gozler",fullName:"Serdar Gözler"}],corrections:null},{id:"58681",title:"Temporomandibular Joint Pathology and Its Indication in Clinical Orthodontics",doi:"10.5772/intechopen.72651",slug:"temporomandibular-joint-pathology-and-its-indication-in-clinical-orthodontics",totalDownloads:1731,totalCrossrefCites:0,totalDimensionsCites:1,hasAltmetrics:0,abstract:"Temporomandibular joint (TMJ) pathology has been an area of study in dentistry specifically a research interest in clinical orthodontics in which treatment option has been a dilemma for practitioners. Discussion between ‘dos’ and ‘don’ts’ in growth modification has drawn spread however opposite opinions from different schools of thoughts in whether growth modification itself is working. To provide a better illustration of biological process within TMJ, this chapter discussed aspects including overall condylar growth; the histological structure of endochondral bone of condyle; extracellular factors that regulate proliferation, differentiation, hypertrophy, terminal maturation and apoptosis of chondrocytes; and molecular regulation of the entire process. An understanding of the pathology, histology, cellular and molecular events related to the morphology and growth of TMJ forms through reading over this chapter; the emphasis of the mechanotransduction mediators and the influence of mechanical strain on the level of expression of genes were presented in details. Novel studies using virus vector stimulating condylar growth through enhancing angiogenesis within a time limit were discussed; also clinical implications in treatment options in relation to mandibular advancement were briefly compared.",signatures:"Bakr M. Rabie, Jeremy Ho and Qianfeng Li",downloadPdfUrl:"/chapter/pdf-download/58681",previewPdfUrl:"/chapter/pdf-preview/58681",authors:[{id:"217282",title:"Dr.",name:"Abou Bakr Mahmoud",surname:"Rabie",slug:"abou-bakr-mahmoud-rabie",fullName:"Abou Bakr Mahmoud Rabie"},{id:"238962",title:"Dr.",name:"Qianfeng",surname:"Li",slug:"qianfeng-li",fullName:"Qianfeng Li"}],corrections:null},{id:"59286",title:"Surgical Approaches to the Temporomandibular Joint",doi:"10.5772/intechopen.74141",slug:"surgical-approaches-to-the-temporomandibular-joint",totalDownloads:6972,totalCrossrefCites:3,totalDimensionsCites:3,hasAltmetrics:0,abstract:"The temporomandibular joint (TMJ) acts as a sliding hinge between mandible and temporal bone. Disorders of temporomandibular joint are intolerable for the patients in severe cases. Furthermore, surgical treatment of temporomandibular joint problems is a challenge for surgeons in some cases. In that order, it is critical for the surgeon to choose the best surgical approach in treating the temporomandibular joint diseases. There are several surgical approaches in the management of temporomandibular joint problems including some pros and cons. So, in this chapter, we aim to present a comprehensive review of surgical approaches to the temporomandibular joint.",signatures:"Mohammad Esmaeelinejad and Maryam Sohrabi",downloadPdfUrl:"/chapter/pdf-download/59286",previewPdfUrl:"/chapter/pdf-preview/59286",authors:[{id:"172188",title:"Dr.",name:"Mohammad",surname:"Esmaeelinejad",slug:"mohammad-esmaeelinejad",fullName:"Mohammad Esmaeelinejad"},{id:"240723",title:"Dr.",name:"Maryam",surname:"Sohrabi",slug:"maryam-sohrabi",fullName:"Maryam Sohrabi"}],corrections:null}],productType:{id:"1",title:"Edited Volume",chapterContentType:"chapter",authoredCaption:"Edited by"},subseries:null,tags:null},relatedBooks:[{type:"book",id:"1591",title:"Infrared Spectroscopy",subtitle:"Materials Science, Engineering and Technology",isOpenForSubmission:!1,hash:"99b4b7b71a8caeb693ed762b40b017f4",slug:"infrared-spectroscopy-materials-science-engineering-and-technology",bookSignature:"Theophile Theophanides",coverURL:"https://cdn.intechopen.com/books/images_new/1591.jpg",editedByType:"Edited by",editors:[{id:"37194",title:"Dr.",name:"Theophile",surname:"Theophanides",slug:"theophile-theophanides",fullName:"Theophile Theophanides"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"3161",title:"Frontiers in Guided Wave Optics and Optoelectronics",subtitle:null,isOpenForSubmission:!1,hash:"deb44e9c99f82bbce1083abea743146c",slug:"frontiers-in-guided-wave-optics-and-optoelectronics",bookSignature:"Bishnu Pal",coverURL:"https://cdn.intechopen.com/books/images_new/3161.jpg",editedByType:"Edited by",editors:[{id:"4782",title:"Prof.",name:"Bishnu",surname:"Pal",slug:"bishnu-pal",fullName:"Bishnu Pal"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"371",title:"Abiotic Stress in Plants",subtitle:"Mechanisms and Adaptations",isOpenForSubmission:!1,hash:"588466f487e307619849d72389178a74",slug:"abiotic-stress-in-plants-mechanisms-and-adaptations",bookSignature:"Arun Shanker and B. 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Aortic root dilation (AoD) is frequently an incidentally discovered, asymptomatic finding in that is seen on various imaging modalities [1]. The anatomy of the aortic root includes the annulus, sinuses of Valsalva, sinotubular junction and ascending aorta [1], with the size being a function of a patient’s biologic variables such as height, age, BSA, and gender [1, 2]. However, while natural variations in the size of the aortic root are well known, the identification of progression from normal to pathologic AoD is a key clinical diagnosis that carries significant cardiovascular risk including aortic dissection, rupture, valvular regurgitation and cardiac tamponade [1, 3, 4, 5]. The etiology of pathological AoD is varied, ranging from congenital, infectious, autoimmune, and idiopathic conditions; and influences the medical and surgical management [1, 5]. Due to the variety of clinical conditions that can result in AoD, and the risks associated with worsening AoD, a thorough understanding of the pathophysiology of AoD, noninvasive imaging modalities and pharmacologic therapies is critical. The aim of this chapter is to review the most common conditions associated with AoD, appropriate imaging modalities, and treatment strategies to manage AoD.
\nMultiple etiologies of AoD exist such as Marfan syndrome, bicuspid aortic valve, Loeys-Dietz and Ehler-Danlos syndromes, idiopathic conditions, hypertension, infections, and inflammatory disorders. In this chapter, we will discuss the various etiologies categorized into two standardized groups—genetically-mediated and nongenetically mediated AoD.
\nGenetically-mediated aortic root dilation or enlargement is the leading cause of thoracic aortic aneurysms. Marfan syndrome (MFS), the prototype condition for AoD, and bicuspid aortic valve has led to a greater understanding of AoD pathophysiology, pharmacologic treatment, timing of surgical intervention and optimal surveillance strategies with noninvasive imaging [6].
\nMFS is one of the most common hereditary disorders of connective tissues and is characterized by manifestations in cardiovascular, skeletal, and ocular systems [7]. MFS is the most common genetic cause of thoracic aortic aneurysms (TAAs). Its inheritance is almost exclusively autosomal dominant and mostly involves a mutation of the fibrillin-1 (FBN1) gene encoding the connective tissue structural protein fibrillin-1 [8]. The widely accepted incidence of Marfan syndrome is ~1 in 5000 individuals [9].
\nAlthough the inheritance pattern is predominantly autosomal dominant, rare cases of autosomal recessive FBN1 gene mutations has been described [10]. While patients with Marfan phenotypes usually have an affected family member, 25% of the cases are sporadic due to
The diagnosis of Marfan syndrome is established by using a combination of clinical manifestations, family history, and the presence of FBN1 mutation. In order to facilitate accurate recognition of the syndrome and improve patient management and counseling, a set of defined clinical criteria, called the Ghent nosology was developed [16] and later revised [17] (Table 1). Apart from the genetic testing for FBN1 mutation, Ghent nosology uses a systemic score calculation using clinical manifestations of Marfan and an aortic root dilatation Z-score (see noninvasive imaging below).
\nPatients with family history of Marfan disease | \n
\n
| \n
\n
| \n
\n
| \n
Patients without family history of Marfan disease | \n
\n
| \n
\n
| \n
\n
| \n
\n
| \n
Revised Ghent nosology.
One of the major causes of mortality and clinical hallmark of Marfan syndrome is aortic root dilation and related complications such as dissection, rupture and/or aortic valvular regurgitation. Aortic root dilation is typically first identified on echocardiography in 60–80% of Marfan patients [18]. Therefore, surveillance echocardiography has been routinely used to serially monitor aortic dimensions. If the aortic root diameter is above 4.5 cm in adults, aortic dilation rates are above 0.5 cm/year, and/or significant aortic insufficiency is already present, more frequent monitoring is recommended [6] (see Diagnosis and Surveillance of Aortic Root Dilation below for more detailed guidelines).
\nBicuspid aortic valve is one of the most frequent congenital heart anomalies in adults, affecting 0.9–2% of the population [19]. Most cases of bicuspid aortic valve are familial and studies show that heritability of the disease is ~90% making it an autosomal dominant pattern with incomplete penetrance [20]. Bicuspid aortic valve can occur alone or with other congenital cardiovascular disorders such as coarctation of the aorta, supravalvular or subvalvular aortic stenosis, and ventricular septal defect [21].
\nThe diagnosis is often established by transthoracic echocardiogram (TTE), which has high sensitivity (~92%) and specificity (~96%) [22]. TTE is also useful for surveillance of potential complications of bicuspid aorta such as aortic stenosis, aortic dilation, aortic regurgitation, and infective endocarditis [23]. Given the risk of inheritance, first degree relatives are also recommended to be screened with TTE [21].
\nPrevalence of aortic dilation in patients with bicuspid aortic valve disease ranges from 20 to 84% depending on the criteria used in different studies [24]. The risk of aortic dilation increases with age and the risk of dissection increases as the aortic diameter increases [25, 26]. When the aortic root diameter is above 4.5 cm, there is a family history of aortic dissection, or aortic diameter change is rapid it is recommended to perform echocardiogram annually [21]. More frequent surveillance is recommended for patients with aortic root diameters approaching surgical thresholds (see Surgical Interventions section below).
\nLoeys-Dietz syndrome (LDS) is a rare congenital syndrome characterized by hypertelorism (widely spaced eyes), a split uvula or cleft palate, tortuous arteries and aortic aneurysms. LDS shares many features with Marfan syndrome [14]. Most of the LDS cases are sporadic or show an autosomal dominant pattern of inheritance [14].
\nThe incidence and prevalence of the disease is still not well established.
\nLoeys-Dietz syndrome was initially classified into two subtypes based on the severity of the cutaneous and craniofacial features but later was divided into six subtypes stratified by genotypes [27]. These subtypes are labeled 1–6 and associated with mutations in TGFBR1, TGFBR2, SMAD3, TGFB2, TGFB3, SMAD2, respectively [27]. Type 1 and type 2 are the most commonly seen subtypes with frequencies of 20 and 55% among all subtypes, respectively [28].
\nAortic root dilation is a hallmark feature of this disease entity and is frequently seen in patients (~80%) [29]. Another vascular manifestation is aneurysms throughout the arterial tree. This is a concerning clinical manifestations of the disease and can cause aggressive arteriopathy; therefore, early operative intervention at ascending aortic diameters of ≥42 mm is recommended [30].
\nEhlers-Danlos syndromes (EDS) are a heterogeneous and relatively rare group of connective tissue disorders characterized by skin hyperextensibility, joint hypermobility, and tissue fragility [31]. Ehler-Danlos syndrome can present with a variety of clinical manifestations and can be caused by different kinds of genetic mutations. Overall prevalence of EDS is ~1 in 5000 and EDS hypermobile (hEDS) is the most common type [31].
\nVascular complications can be seen with different types of EDS; however, it is most commonly seen in type IV (vascular or arterial ecchymotic type; vESD), characterized by an autosomal dominant mutation in COL3A1 (collagen, type III, α-1 gene) encoding type III procollagen [32]. Up to 80% with vESD patients suffer from vascular complications by the age 40 years [32]. Therefore EDS patients, especially vEDS, patients should be routinely evaluated for aortic root disease. These patients are recommended to undergo elective operation at smaller diameters (4.0–5.0 cm) to avoid acute dissection or rupture. Patients with a growth rate of more than 0.5 cm/year in an aorta that is <5.5 cm in diameter are recommended to be considered for operation [33].
\nAortic root dilation is an established phenomenon that has shown strong correlations to key pathobiological factors such as age, body surface area (BSA), height and gender. The correlation of aortic root size with age and BSA were initially described in the development of screening nomograms using M-mode echocardiograms [34]. Follow up studies with 2D echocardiography further validated these correlations, allowing for the development of nomograms for normal patient populations or adjusted for patients with underlying congenital disorders (i.e., Marfan syndrome) [2, 35]. These studies evaluating AoD by echocardiograms are further supported by reviews of autopsy data that show clear correlations to key pathobiological factors such as increased age and height with AoD [36].
\nDespite the validation of age as being correlated strongly with AoD, the mechanism of age on the development of AoD still remains an area of active research. One of the predominant hypotheses is based on the idea of cyclic stress, and how the aorta degrades through gradual mechanical decline of elastin proteins [37]. Elastic arteries, namely the aorta, are estimated to dilate by 10% with each beat [38]. It is hypothesized that the shear stress over a normal lifetime results in the degradation of elastic lamella, resulting in arterial dilation and stiffening [38]. This is corroborated by histologic data demonstrating damage to medial elastin of the proximal aorta [38]. Furthermore, there is evidence to suggest that in the absence of risk factors such as hypertension or atherosclerosis, the aortic wall undergoes age-associated reprograming that is proinflammatory promotes progression of arterial disease [39]. Wang et al. demonstrated in pathologic samples of aortas that age correlated with increased smooth muscle cell invasion, and increased production of downstream angiotensin II mediators [39].
\nIn addition to age and BSA, gender is another key factor which can increase the risk and progression of AoD [40]. In the Framingham study of 1849 men and 2152 women, not currently diagnosed with cardiac disease or having a cardiac history, aortic root was 2.4 mm smaller in women than men with m-mode echocardiography [40]. A systematic review in 2014 of 10,741 patients with hypertension revealed men had a significantly higher incidence of AoD relative to women [41].
\nIn conclusion, a series of biological variables are correlated with AoD, and it is important to take these into account as they are potential confounders or contributors in the evaluation of patients with pathologic AoD. Even exercise capacity has been correlated with AoD, with a recent meta-analysis showing that athletes defined by participation in National Collegiate Athletic Association (NCAA) or international equivalent had an aortic root diameter that was larger than nonathletic controls [42], and a statistically significant increase by measurement of sinuses of Valsalva and aortic root annulus [42]. It is important to understand the significance of biological variables such as age, height, BSA, or gender to fully evaluate pathologic AoD without the influence of known confounders.
\nHypertension is a well-known risk factor for aortic dissection, and in some studies, it is estimated to factor into roughly half of the overall risk for aortic dissection [43]. A recent prospective cohort study of 30,447 patients, 86% of patients who developed aortic dissection had hypertension [4]. However the relationship between hypertension and AoD is not as clearly established. In a Framingham study of 3195 patients, there was no relationship between the development of AoD with hypertension [44]. A subsequent follow up study of Framingham participants evaluating aortic root diameter was positively correlated with mean arterial pressure, but negatively associated with pulse pressure, indicating that the mechanism behind AoD is more complicated [45]. Moreover, investigations have shown that in patients with other comorbidities for AoD, such as, Turner syndrome, hypertension is significantly associated with increased prevalence of AoD [45]. This has led to interesting insights into the cyclic stress hypothesis of the development of AoD [43]. If AoD develops due to chronic shear stress, then it would be expected that AoD is correlated with higher pulse pressure (PP), which would presumably lead to greater stress and aortic dilation [43]. However, studies have reported an inverse relationship between AoD and PP [43]. Additionally a systematic review in 2014 showed that in a population of 10,791 hypertensive patients, 9.1% had AoD with a significant gender skew toward men [41]. However there was no significant correlation of mean arterial pressure or pulse pressure values and AoD [41]. While hypertensive patients have a higher incidence of AoD, the mechanism remains to be further investigated. Moreover, these unclear correlations between MAP, PP, and AoD suggest that the aorta is not static, but a dynamic structure whose response to stress, such as hypertension, is still being elucidated [43].
\nSince the first mass production of penicillin in 1945, the modern era of antibiotics has resulted in a decrease in the prevalence of mycotic aneurysms due to bacterial infections in developed countries [46, 47]. However they can still be found in developing countries, and are rare but well described causes of mycotic aneurysms [46]. Most common pathogens include
\n
Tuberculosis is a relatively common infection especially in developing countries [53].
There have been case reports proposing an association between aortic aneurysms and HIV [50]. In a variety of these cases the causes are generally multifactorial, as the majority of cases have reported coinfections (Q fever and leishmaniasis) or comorbid autoimmune conditions (giant cell arteritis) [55, 56]. It is still an area of investigation as to whether there is a true association, and there is sparse data showing a relationship with AoD.
\nAnkylosing spondylitis, a seronegative spondyloarthropathy, is a chronic, progressive rheumatologic disorder, and was one of the first found to be associated with aortitis [50, 57]. The proposed mechanism of AoD in ankylosing spondylitis is fibrous growth development along the intima, which leads to subsequent weakening [57]. Prior TEE studies further evaluated the prevalence of AoD in ankylosing spondylitis, and 82% of patients with ankylosing spondylitis had aortic root abnormalities [58]. Specifically, 61% of patients had aortic root thickening and 25% of patients had AoD [58]. AoD in these populations is a relatively common phenomenon and is associated with significant cardiac morbidity [45, 57].
\nRelapsing polychondritis is another autoimmune disorder, which is a multisystem inflammatory disorder that primarily affects the cartilaginous structures of the body [59]. Cardiovascular involvement is common, estimated to be the second most frequent cause of death and can result in aneurysm development in 5% of cases of both thoracic and abdominal aorta [50, 59]. AoD has been known to occur, albeit rare, with cases of requiring surgical revision after the development of aortic regurgitation [60, 61].
\nTakayasu arteritis is a chronic granulomatous large vessel vasculitis, predominantly found in pediatric populations [50, 62]. A rare disorder, the pathogenesis is characterized by granulomatous panarteritis that can affect the entirety of the aorta and major branches, however predominantly affects the common carotid and subclavian artery [62]. While rare, there are reports of AoD from Takayasu arteritis resulting in aortic regurgitation [63, 64].
\nGiant cell arteritis is a large vessel vasculitis that is characterized by chronic granulomatous inflammation [50]. While commonly affecting carotid, temporal and vertebral arteries, it has been known to affect the ascending aorta, at times resulting in dissection or aortic valve insufficiency [50]. The development of AoD from GCA may be influenced by other comorbid conditions such as HIV; however, this association is currently only supported with case reports [55].
\nAdditionally left ventricular hypertrophy is reported to be positively correlated with AoD. Early retrospective reviews of echocardiographic studies have shown a positive relationship between LVH and AoD, and this has been further supported in subsequent systematic reviews [41, 65]. Patients with AoD with concomitant left ventricular hypertrophy are shown to have an increased risk of adjusted cardiovascular events [66]. However as with previous studies, the exact mechanism between LVH and AoD is still being determined.
\nAortic root dilation is typically a silent disease, with most cases being diagnosed incidentally on imaging. AoD can become symptomatic as the aneurysm enlarges. Aortic root aneurysms grow at an average of 1–4 mm/year [5], with a faster rate of growth noted in patients with bicuspid aortic valves, Marfan syndrome, ESRD, male gender, and smokers [5, 67]. When the aneurysm enlarges to the point of compressing surrounding structures the patient may begin to observe symptoms—the most common of which is chest pain, seen in up to 75% of patients [5, 68]. Other nonspecific symptoms can include back pain, abdominal pain and fatigue (though only present in 5% of patients).
\nAdditionally, patients may present with symptoms secondary to complications of a dilated aortic root such as aortic insufficiency and congestive heart failure. Thus, patients can develop dyspnea as the presenting symptom of aortic root dilation up to 40% of the time [68]. Other presenting symptoms may be related to the complications noted in Table 2 [69, 70, 71, 72, 73, 74].
\nComplication of aortic root aneurysm | \nPresenting symptom | \n
---|---|
Aortic insufficiency, aortic regurgitation | \nDyspnea, diastolic murmur, congestive heart failure symptoms | \n
Aortic dissection | \nSharp chest pain, may radiate to the back | \n
Thromboembolism | \nSymptoms of stroke | \n
Compression of tracheal or bronchus | \nHemoptysis, cough, recurrent pneumonitis | \n
Compression of left recurrent laryngeal nerve | \nHoarseness | \n
Compression of superior vena cava | \nSigns of superior vena cava syndrome | \n
Compression of esophagus | \nDysphagia | \n
Complications and presenting symptoms of aortic root dilation.
Acute aortic emergencies that occur secondary to aortic root dilation include dissection, rupture, and aortic insufficiency. As the aortic root diameter increases, the risk for aortic dissection and rupture rises [75]. Aortic dissections are the most common acute aortic emergencies [76], and can be classified depending on the segment of the aorta affected: type A dissections involve the ascending aorta (seen in aortic root dilation), while type B dissections are those that occur distal to the left subclavian artery.
\nAortic dissection most commonly presents with acute onset chest pain that may radiate to the back. The character of the pain has traditionally been described as ripping or tearing in nature, however over half of patients may instead complain of sharp pain [77]. In addition, geriatric populations are less likely to have an acute onset of pain [78]. Physical exam findings that may be present include unequal blood pressures in the upper extremities, a new diastolic murmur indicative of acute aortic regurgitation, or muffled heart sounds secondary to tamponade (with proximal extension of the dissection). Imaging may be notable for widening of the mediastinum on CXR [77]. In order to aid in the diagnosis of a dissection, an aortic dissection detection risk score (ADD-RS) has been developed. The score is comprised of three categories: the presence of high risk conditions such as Marfan syndrome, the presence of typical symptoms (such as abrupt onset chest pain), and the presence of physical exam findings such as unequal blood pressure readings in the upper extremities. Each group is given a score of 1 if a feature is present, and the total score helps pave the next steps of workup—a score of 0 can be followed by diagnostic workup of other pathologies, while scores of 2–3 should be followed by expedited workup and immediate surgical consultation for possible aortic dissection [79].
\nAortic rupture is also an acute and life-threatening complication of aortic root dilation. It can present similarly to aortic dissection with regards to chest pain, however rupture can lead to severe and abrupt hypotension. Moreover, contingent with the site of rupture the patient may have symptoms such as hemoptysis [80] (if there is rupture into the lung), hematemesis [81] (if there is rupture into the esophagus), or cardiogenic shock [82] (if there is rupture into the pericardial cavity with resultant tamponade physiology).
\nAortic root dilation may also lead to aortic insufficiency. Roughly 30% of aortic insufficiency is now recognized as being caused by aortic root dilation, surpassing the incidence of any valvular cause [83]. The pathophysiology is related to stretching of the aortic valve annulus secondary to aortic root dilation, which results in incomplete closure of the aortic leaflets during diastole. Unfortunately, at the onset of aortic regurgitation, patients may be asymptomatic; therefore, congestive heart failure can develop when the regurgitant valve goes unnoticed.
\nWhile aortic root aneurysms are known to grow at an average of 1–4 mm/year [5], it is difficult to ascertain how fast an individual’s aortic root aneurysm will grow, therefore necessitating surveillance imaging. The frequency of surveillance imaging recommended is dependent on the etiology of the aortic root dilatation as well as its size, with genetically mediated aortic disease having a lower threshold for more frequent (biannual) imaging [84]. At the very least however patients are recommended to have annual imaging for aortic root dilation to closely monitor the aortic diameter. The impact that frequent imaging (CT, MR angiography or echocardiography) has on public health is likely significant, with cumulative costs. In addition, any patient with a bicuspid aortic valve should be screened for a thoracic aortic aneurysm, as well as screening all first-degree family members of a patient with genetic conditions such as Marfan syndrome [85].
\nThe aortic root is the most proximal segment of the aorta. It extends from the annulus of the aortic valve to the sinotubular junction (STJ). It is composed of the left, right, and non coronary sinuses of Valsalva. The diameter of the aorta decreases as it moves distally. The aortic root is assessed using multimodality imaging techniques. These include transthoracic echocardiogram (TTE), cardiac magnetic resonance imaging (cMRI), and cardiac computed tomography angiography (cCTA).
\nTTE is widely used for the detection and monitoring of aortic root pathology. Early studies established age- and sex-specific nomograms for aortic root measurements [86]. These studies used the motion mode (M-mode) of TTE, in which the amplitude of the ultrasound pulses amplitudes is converted to corresponding level on gray-scale imaging [86]. Using the M-mode, the American Society of Echocardiography (ASE) has recommended using the leading-edge to leading-edge approach for measuring the aortic root [87]. Later studies used 2D TTE and obtained reference measurements of the aortic root. This is now preferred over M-mode images, which may be off-axis and are subject to aortic motion that may produce erroneous measurements.
\nOn echocardiogram, the aortic root diameter is typically measured in the parasternal long-axis view from the right coronary sinus to the opposite sinus of Valsalva. When unable to obtain the long axis view, the parasternal short axis view may provide more accurate measurements. However, universal landmarks to measure the root in this view have not been established. Some suggest measuring the diameter from the right coronary sinus to the opposite commissure. These measurements are typically performed at end diastole, as this represents the resting aortic diameter [88]. In adults, these measurements correlate with age and body size. In addition, the aorta is about 2 mm larger in men compared to women due to differences in body size [89]. Normal values stratified by body surface area and age have been published by the ASE [87].
\nImportantly, TTE is limited by its two-dimensional images and thus does not give a complete depiction of the aortic root. It is also limited by patient factors that limit the visualization windows and thus aortic root measurement. Since the aorta is not a straight tube, it can be imaged obliquely leading to over-estimation of its true diameter. Newer modalities, such cMRI and cCTA, can provide three-dimensional images.
\nDespite ECG-gated CT being the most accurate modality for evaluating the thoracic aorta, it is limited by the radiation and contrast exposure. This is particularly important in younger patients with connective tissue disorders that require serial follow up imaging. Cardiac MRI provides an alternative approach for imaging the thoracic aorta including the aortic root and is considered the preferred modality in select groups. It can be performed with ECG gating to provide motion-free evaluation of the aorta. In addition, young patients, in whom this is more commonly used, can hold their breath for longer periods, allowing acquisition of images with high spatial resolution.
\nCardiac MRI evaluation of the aorta does not require contrast use. MRI sequences used include balanced steady-state free precession (SSFP) sequences, fast imaging employing steady-state acquisition (FIESTA), true fast imaging with steady-state precession (FISP), and balanced fast-field echo (FFE) sequences. These sequences provide a high signal-to-noise ratio and adequate contrast between vessel wall and blood pool [90]. When used with ECG gating and contrast enhanced MRA, images tend to have less artifact, higher resolution, and overall short imaging time. Another approach is to use ECG gating 2D balanced SSFP sequence that is oriented perpendicular to the aortic root in two planes to assess the aortic valve and root throughout the cardiac cycle. In addition, prospective ECG gating and respiratory navigation with three-dimensional balanced SSFP sequences can provide 3D aortic imaging without contrast administration [91, 92].
\nIt is important to note that different methods of aortic measurement have been described and guidelines are less well defined. Aortic root measurements can be challenging given different approaches. Burman et al. found in the Framingham Heart Study that cusp-commissure dimensions better corresponded with reference echocardiographic aortic root measurements [89, 93]. This best correlated with study measurements after averaging the three end-diastolic cusp-commissure measurements [93]. In addition, there is a lack of consensus with regard to measurements used (inner lumen only versus lumen and wall) and whether measurements should be adjusted to body surface area, sex, and age.
\nAlthough TTE is widely used for the imaging and surveillance of aortic root, cardiac computed tomography angiography (cCTA) is currently the most commonly used technique for the study of the thoracic aorta. Main advantages of cCTA are fast scanning times, low artifact sensibility, and wide availability including emergency rooms operating 24 h [94].
\nThe new generation CT scanners acquire high-resolution 3D datasets of the thoracic aorta, showing sensitivities up to 100% and specificities of 98–99% [95]. ECG synchronization is vital for detailed assessment of the aortic root anatomy since it allows suppression of pulsation artifacts [96]. ECG gating also allows viewing images in a particular phase of the cardiac cycle. Unfortunately, the ECG-gated technique can increase the acquisition time and required breath-hold time. In order to minimize the increased acquisition times, employment of a 64 or wider ECG-gated row detector system is suggested [95, 97].
\nModern CT scanners can be used to employ several different cardiac synchronization methods such as prospective ECG triggering where images are only acquired during a specified portion of the cardiac cycle, starting at a predetermined delay from the R wave; retrospective ECG gating where the desired cardiac phase is selected retrospectively from the raw data [95, 97]. The details of each technique will not be discussed in this chapter; however, it is important to determine the advantages and disadvantages of different techniques. The main limitations of CT are related to the radiation exposure and the use of iodinated contrast media and different techniques come at a higher cost of each limitation.
\nFor the surveillance of aortic root, any technique can be used and be useful; therefore, the technique with the least amount of radiation exposure should be selected such as prospective sequential triggering without padding, retrospective gating with tube-current modulation optimized for diastolic-phase datasets only, or a prospectively triggered high-pitch helical acquisition [95, 97]. Retrospective ECG gating acquires redundant helical CT data which allows the reconstruction of images at different cardiac phases and providing detailed images which can be useful in complicated cases and pre-/post-operative imaging since pseudoaneurysm or small leaks which are some of the most common complications of aortic root surgery can only be detected during a specific phase of the cardiac cycle. Iodinated contrast-media is another risk related to CT imaging given the risk of contrast induced nephropathy and allergic reactions of various severity. Surveillance CT data for the dimensions of aortic root can be acquired without contrast injection; however, a complete endoluminal evaluation can only be achieved by the injection of contrast-medium [97].
\nIt is standard of care to monitor the size of aortic aneurysms that are below surgical threshold, <5.5 cm for nongenetic aneurysms and <5.0 cm for genetically-mediated aneurysms [98]. In general, physicians should be conscientious about patient cumulative radiation exposure as there is evidence that it can increase cancer incidence and cancer mortality [99]. One study estimated that ionizing radiation exposure results in 0.7% of total expected baseline cancer incidence and 1% of total cancer mortality. These rates increase with greater cumulative exposure [99]. Therefore, physicians should opt to perform serial CT imaging with longer intervals in the most appropriate patients. A study investigating patients with moderate-risk thoracic aortic aneurysms (defined as size <5.0 cm) showed that patients with aneurysms below 4.3 cm had overall lower risk of significant aneurysm growth or size reaching surgical threshold. Thus, the authors suggested that these subset of patients undergo surveillance CT scans less frequently.
\nManagement focuses on slowing the rate of growth and the complications of aortic root dilation. The line of management that is chosen for a patient depends on symptoms and size of the aneurysm. For patients who are asymptomatic and have root dilation <55 mm, medical management is advised. In patients with Marfan syndrome or a bicuspid aortic valve, the cut off of ≤50 mm is used for medical management [1, 100].
\nThe use of beta blockers has shown a survival benefit in patients with aortic root dilation secondary to Marfan syndrome [101]. While data on survival benefits for patients with bicuspid aortic valves is sparse, the common practice is to also prescribe beta blockers given that both conditions share a similar pathology and therefore both are likely to benefit from beta blockade. The mechanism by which beta blockers slow the progression of aortic root dilation is through their negative inotropic and chronotropic effects, reducing the peak left ventricular ejection rate and therefore decreasing shear stress and the rate of aortic dilation [102].
\nThe goal blood pressure for patients with thoracic aortic aneurysms is <130/80 mmHg. In patients who cannot tolerate beta blockers, calcium channel blockers (CCB) are an alternative group of medications available. While less studied as compared to beta blockers, CCB have also been found to reduce the rate of aortic root dilation [103]. Other agents that can be used for additional blood pressure control include ACE-inhibitors and ARBs.
\nIn order to reduce the risk for complications such as aortic dissection, patients should be counseled on smoking cessation, and cessation of drugs that increase aortic wall stress such as cocaine or other stimulants. In addition patients should have dyslipidemia well controlled, which can be achieved through the use of atorvastatin 40–80 mg daily in individuals with aortic root aneurysms [104, 105].
\nPatients should be counseled on avoiding high intensity and collision sports, such as boxing and cycling. Instead patients should take part in low dynamic sports, such as, golf [5, 106]. Pregnancy should be avoided in patients with Marfan syndrome with an aortic diameter >40 mm, if a patient does chose to become pregnant however there must be close follow up with surveillance imaging of the aortic diameter [5, 101].
\nEmergent surgical interventions are indicated for management of an aortic dissection or rupture, or a symptomatic aneurysm. In addition, surgical repair can be performed electively in high risk patients to prevent propagation of an aneurysm (Table 3). Indications for elective surgical intervention include the absolute size of the aneurysm—if the diameter is over 55 mm, or over 50 mm in patients with Marfan syndrome or bicuspid valves. Other indications for elective surgery include if the rate of growth of an aneurysm surpasses 10 mm/year, and if there is concurrent aortic insufficiency [1, 100]. In addition, patients who undergo aortic insufficiency repair who have concurrent aortic root dilation should be considered for aortic replacement at the time of their surgery—that is since 25% of patients with aortic root diameters >40 mm will eventually also require intervention for their aortic aneurysm [107].
\nEmergent surgical repair | \nElective surgical repair | \n
---|---|
\n
| \n\n
| \n
Indications for emergent and elective surgical repair of aortic root dilation.
As opposed to supravalvular aortic aneurysms, aortic root aneurysms involve the coronary ostia as well as the aortic valve, which have implications on the type of surgical procedure available for patients. There are two approaches for a surgical intervention: radical and conservative. In a radial surgical intervention the patient’s aortic valve and root are replaced (commonly referred to as the Bentall procedure), whereas in conservative interventions only the aortic root is replaced [108].
\nThe Bentall procedure involves replacing the aortic valve with a prosthetic valve, and thus has the caveat of requiring indefinite anticoagulation [5]. If patients have a high bleeding risk it may therefore be worthwhile investigating replacement of the aortic root while preserving the valve. In addition, it is important to note that a large number of patients with aortic root dilation are young (secondary to its association with Marfan syndrome), and therefore lifelong anticoagulation in cases such as these confers a cumulative bleeding risk. Preserving the aortic valve while surgically treating the aortic root dilatation is made possible by the development of two surgical procedures: the first is removing the aortic root while keeping the valve intact. The second method is through re-implantation of the aortic valve [5]. Both the Bentall procedure as well as aortic valve-preserving procedures have been shown to have comparable short and long-term outcomes with regards to the risk of death and valve associated complications. The main difference however is that patients undergoing valve sparing operations were significantly more likely to develop moderate to severe aortic regurgitation later [108].
\nIn patients with both severe aortic stenosis and ascending aortic aneurysm, undergoing surgical aortic valve replacement (sAVR) and concomitant surgical intervention for aortic aneurysms above 4.5 cm is recommended by the American College of Cardiology (ACC) foundation guidelines [84]. However, in high-risk surgical patients, undergoing a transcatheter aortic valve replacement (TAVR) has become an alternative approach that obviates the need for parallel surgical aortic aneurysm intervention. This raises the concern for the safety of TAVR catheter-based delivery system in patients with aortic aneurysms since intraoperative rupture or dissection risk potentially increases. However, a clinical study showed that TAVR does not increase intraoperative aortic dissection/rupture risk or mortality with a median follow-up of 14 months [109]. Therefore, there are no recommendations against performing TAVR in patients with ascending aortic aneurysms.
\nNone.
Considered the second most commonly performed operation after cesarean section worldwide, hysterectomy may be classified as abdominal (laparotomy, laparoscopy, or robotic assistance) and vaginal (via an incision through the superior part of the vagina).
The most common indications for hysterectomy are benign conditions such as uterine fibroids, endometriosis, genital prolapse, pelvic pain, heavy menstrual bleeding, but the technique is also used for gynecological malignancy (usually ovarian, uterine, or cervical) and risk-reducing surgery (in cases of BRCA 1 or 2 mutations or Lynch syndrome) [1, 2, 3, 4].
Actually, there are three types of hysterectomy—total hysterectomy (the uterus and cervix are removed), subtotal or partial hysterectomy (the uterus is removed, but the cervix is left in place), and total hysterectomy with bilateral salpingo-oophorectomy (uterus, fallopian tubes, ovaries, and cervix are removed) [1, 2, 3, 4]. The term radical hysterectomy (removal of the uterus, cervix, parametrium, vaginal cuff, and fallopian tubes) is used to describe a wide range of procedures universally applicable to cervical cancer. However, the degree of radicality clearly depends on preoperative estimation of tumor location, surgical margins and the risk of occult lymphatic spread. Moreover, the ovaries may or may not be removed according to the patient age [1, 2, 3, 4]. In addition, supracervical hysterectomy is sometimes preferred to diminish the intraoperative complications and surgical times, as well as to limit the possibility of lower urinary tract issues and maintain normal sexual function [1, 2, 3, 4].
The best route for hysterectomy is multifactorial, depending not only on the surgeon’s skills and patient safety (minimally invasive procedures as vaginal, laparoscopic, laparoscopic-assisted, and robotic-assisted hysterectomies) but also on economic reasons [1, 2, 3, 4].
Hemorrhage after hysterectomy is recognized as an occasional life-threatening complication in modern gynecological surgery, assuming appropriate medical and surgical management [2, 3, 4, 5, 6, 7, 8, 9].
Classified as “reactionary” (postoperative bleeding within the first 24 hours following surgery) and secondary (bleeding occurring in the interval 3–22 days after surgery), unexpected hemorrhage may arise regardless of the route or subtype of hysterectomy [5, 6, 9]. Early recognition and prompt intervention (reoperation or arterial embolization) to arrest bleeding are essential strategies for the suitable outcome of the patient [2, 3, 4, 5, 6, 7, 8, 9, 10].
While the role of risk factors for “reactionary” hemorrhage is emerging and critical for a correct assessment of the patient, operative laparoscopy is still ideal to treat hemorrhage after vaginal hysterectomy, laparoscopic hysterectomy, laparoscopic-assisted vaginal hysterectomy, and laparotomy being necessary only in selected cases [2, 3, 4, 6, 9].
Secondary hemorrhage presents with varying degrees of severity and tends to be more common after laparoscopic hysterectomy, especially total laparoscopic hysterectomy than after the other hysterectomy approaches [5, 9]. Factors potentially responsible are vaginal vault infection, vault hematoma, a poor surgical technique including excessive thermal injury by electrocoagulation, and early resumption of physical activity, large uterus size, excessive use of an energy source for the uterine artery, and culdotomy [2, 3, 4, 5, 7, 9, 10].
Ultimately, the management of secondary hemorrhage is challenging and involves diverse approaches based on the exact cause of bleeding, comprising vaginal packing with or without vault suturing, laparoscopic coagulation of the uterine artery if the source of bleeding could not be identified vaginally or arterial embolization [6, 9, 10].
Because of elective gynecologic surgery, we encourage selective patients to donate their own blood before surgery [6, 11]. Several definitions are actually used:
autologous blood transfusion, when is done with the patient’s own blood; blood is stored and can be transfused during surgery;
homologous transfusion or transfusion from another woman;
parachute pack or umbrella pack is a useful tool for pelvic bleeding after pelvic exenteration;
peanut dissector; this tool is indicated for blunt pressure dissection of small places;
total blood volume; estimated blood volume of total body weight is 8% or 4.5–5.0 liters in the average women. When intraoperative blood loss exceeds 15% of the blood volume, blood transfusion must be taken into consideration in combating hypovolemic shock. About 15% of an adult blood volume can be calculated by amplification a patient’s weight in kg 10 times. The usual method of performing abdominal hysterectomy involved the use of clamps or forceps on vessels.
The present chapter will give an overview on different aspects of bleeding after hysterectomy such as incidence rate, risk factors, mechanisms, and management techniques aiming to expand our knowledge and skills in recognizing and treating this unexpected potentially serious complication. Furthermore, we intend to offer a guide toward standardizing treatment practice across bleeding issues following hysterectomy considering clear recommendations and algorithms.
Postoperative hemorrhage represents a significant potential complication of contemporary gynecological surgery. Despite normal hemostasis, appropriate/suitable surgical technique and close monitoring, postoperative bleeding may occur, leading to the different clinical and operative scenarios and challenging even the most experienced operative team [2, 3, 4, 9, 11, 12].
Based on their timing to surgery, two main subtypes of postoperative hemorrhage are actually recognized [5, 6, 7, 8, 9]:
Although the incidence of postoperative hemorrhage basically varies according to surgery, the difference between abdominal, laparoscopic, and vaginal hysterectomy remains statistically insignificant [5, 6, 7]. Indeed, some authors postulate that postoperative bleeding occurs more frequently after abdominal and laparoscopic than after vaginal hysterectomy, but overall, the incidence of hemorrhagic events after a hysterectomy varies from 0.2 to 3.1%, irrespective of surgical route [5, 6, 7, 8, 10, 13, 14].
On the other hand, the true frequency of delayed bleeding complications is still unknown, although the consequences can be particularly significant in women undergoing outpatient surgery [5, 6, 7, 8, 10, 13, 14]. Paul et al. reported an overall cumulative incidence of secondary hemorrhage after a total laparoscopic hysterectomy of 1.3% [5]. Although secondary hemorrhage is rare, it is more often reported after total laparoscopic hysterectomy than after other hysterectomy approaches [5, 6, 7, 8, 10, 13, 14].
Table 1 summarizes data on the incidence of postoperative hemorrhage reported by several authors.
Authors | Type of study, no of cases | Incidence postoperative hemorrhage |
---|---|---|
Makinen et al. [15] |
|
|
Wilke et al. [13] |
|
|
Holub and Jabor [7] |
|
|
Erian et al. [6] | 719 patients between November 1990 and March 2007: 476 VH, 243 LH |
|
Paul et al. [5] |
|
|
Incidence of postoperative hemorrhage in gynecological surgery.*
AH, abdominal hysterectomy; LH, laparoscopic hysterectomy; VH, vaginal hysterectomy; L-AVH, laparoscopic-assisted vaginal hysterectomy.
Hemorrhage is responsible for about half of the postoperative complications following gynecological surgery, ranging from persistent venous oozing to massive blood loss from injury to retroperitoneal vessels [5, 6, 7, 12, 13].
Main bleeding sites comprise the anterior abdominal wall (both the suprapubic and the umbilical incision), the vaginal cuff (after laparoscopic hysterectomy and laparoscopic-assisted vaginal hysterectomy), and intraabdominal bleeding. Abdominal wall vessel injury occurs with increasing frequency, as the practice of laparoscopic surgery becomes wider and trocars become sharper [2, 3, 4, 7, 9].
The source of bleeding in secondary hemorrhage can be the uterine vessels or descending cervical/vaginal vessels; occasionally, uterine artery pseudoaneurysm can cause delayed heavy vaginal bleeding after laparoscopic hysterectomy [2, 3, 4, 7, 9]; additionally, the technique of vaginal vault closure may also contribute to the occurrence of secondary hemorrhage [5, 9].
Postoperative hemorrhage can result from failure to control vascular injury during surgery. Accurate clamp placement, gentle handling of tissues, and the accuracy of dissection are all important and contribute to maximum efficiency with minimum blood loss and minimum tissue damage when abdominal hysterectomy is performed [9].
The electrosurgical instrument can be used for a precise incision of the abdominal wall with minimal tissue injury. By holding the electrode close to the tissue or touching the metal clamp and pressing the coagulation button, superficial coagulation can be achieved [2, 3, 4, 9].
Intra- and post-operative bleeding generally develops in younger women or those with a more vascular pelvis who underwent a hysterectomy, especially laparoscopic hysterectomy in the presence of fibroids [6, 16].
Possible rationales for secondary hemorrhage comprise a bleeding vessel missed at the end of the procedure, effects of pneumoperitoneum, Trendelenburg position, low intraoperative pressure, wearing off the effect of vasopressin, subacute infection, postoperative analgesia, as well as bleeding disorders [2, 3, 4, 5, 7, 9].
Other potential factors accounting for delayed postsurgical bleeding are vaginal vault infection, vault hematoma, poor surgical technique with excessive thermal injury by electrocoagulation, and early resumption of physical activity [5, 7, 9]. A large-sized uterus, high vascularity, large-sized vessels, excessive use of an energy source for the uterine artery, and culdotomy also play a role in this hemorrhagic event [5, 7, 9].
Most of the complications during or after hysterectomy are preventable or treatable. Other complications may exist as medical conditions before hysterectomy but are worsened during surgery, especially if not managed as part of holistic woman’s care.
Complications after surgery include [2, 3, 4, 9, 12]:
In Romania, the mortality rate following a hysterectomy is very low.
Contemporary management of surgical interventions includes postoperative bleeding and the possibility of blood transfusion with risks of HIV transmission (in 1.9 million cases), the transmission of hepatitis B (one in every 180.000 cases), or a febrile reaction to transfusion (1% cases) [2]. Most experts recommend acute normovolemic hemodilution and cell salvage in women undergoing hysterectomy section who will not accept blood products.
Hypovolemic shock can occur after major bleeding as a direct result of uncontrolled hemorrhage. Depending on the total blood volume lost, hypovolemic shock may be divided into four classes: I (< 75 mL or 15%), II (750–1500 mL, or 15–30%), III (1500–2000 mL or 30–40%) and IV (>2000 mL or > 40%) [6].
The clinical manifestations of class I hypovolemia are not measurable and compensatory mechanisms restore plasma volume within a day. In class II hypovolemia, tachycardia is the most frequent clinical finding as a result of inadequate circulatory volume. The distinction between class I and II hypovolemic shock is made by recording blood pressure and pulse in the standing, sitting, or reclining position. Postural hypotension is observed as result of cardiac failure. Compensatory mechanisms begin to fail with the class III hypovolemic shock. This results in an increase in the arterial and venous oxygen difference with classic signs including worked tachycardia, tachypnea, oliguria, and cold skin. With the class IV hypovolemic shock, a patient’s survival depends on rapid transfusion of blood and immediate surgical intervention before cardiovascular collapse and death or organ system failure.
After initial resuscitative measures are instituted, it is highly recommended for patients to be carried out in a critical care unit. Use of sympathomimetic agents after sufficient hydration and vasodilator is normally preferred in the management of patients with hemorrhagic shock who have arterial pressure higher than 70 mm Hg.
Once restoration of the intravascular volume has been completed, it is important to reassess the patient’s response to blood transfusion when managing women with severe blood loss, especially in those patients who have pulmonary edema, myocardial infarction, or congestive heart failure [12].
Transfusion for patients with hemoglobin of 8–10 mg/dL is no longer recommended.
When major surgery is anticipated and transfusion is massive, platelets in addition to packed cell transfusion are required. It is recommended that cryoprecipitate be reserved for patients with deficiencies in von Willebrand factor, factor VIII, and fibrinogen factor XIII.
Recognized as an uncommon complication of hysterectomy, postoperative hemorrhage represents a true challenge in routine practice [8]; irrespective of the procedure, a close follow-up of the patient in a high-dependency unit is indicated in order to exclude recurrence of bleeding [6, 7].
The key to successful management is timely intervention meaning prompt diagnosis, urgent resuscitation if necessary and rapid decision for either arterial embolization or reoperation according to the severity of bleeding and the hemodynamic stability of the patient. Both techniques are highly effective to control bleeding; nevertheless, if the patient is hemodynamically unstable or of the interval since surgery is under 24 hours suggesting rapid hemorrhage, the emergency return to the operating theater to arrest the bleeding is preferred [6, 7, 9].
Current options for managing hemorrhage include [6, 7, 9]:
every patient should be carefully monitored postoperatively for signs of bleeding (hypotension, tachycardia, tachypnea, abdominal distension);
ultrasound can confirm intraperitoneal bleeding; more ways to determine intraabdominal hemorrhage include abdominal and pelvic CT scan; a routine coagulation profile should be done immediately for the patient with a rapid pulse, low blood pressure, and/or low urine output. The surgeon must take charge of the problem and execute the technical steps necessary to treat hemorrhagic shock in the operating room. Intraperitoneal bleeding can be hidden by incisional pain and analgesic medications. Despite adequate dissection, a small vessel may bleed or the suture may cut through tissue. Skeletonized vessels and small sutures should be used for significantly reducing the incidence of postoperative hemorrhage. Venous bleeding can be more life-threatening than arterial hemorrhage which can be clearly seen and controlled with fast small sutures or clamps.
the presence of unexpected drop in hematocrit or hemoglobin postoperatively.
A simplified algorithm to describe steps after gynecological surgery and potential post-surgery bleeding is provided in Figure 1.
A simplified algorithm of post-surgery bleeding approach.
A closer look at the holistic management of postoperative blood should also underpin the following [9]:
to assess blood value and coagulation mechanisms;
to identify changes in the coagulation components, and to initiate replacement therapy in order to achieve adequate hemostasis. In assessing the patient’s coagulation status, it is very important to avoid such a situation known as the trauma triad of death consisting of—hypothermia, metabolic acidosis, and coagulopathy. In some patients with benign disease, blood transfusion is rarely indicated. Experience has shown that blood transfusion may be significant in women with malignant disease;
to establish the therapeutic strategy by measuring the level of prothrombin time < 14 sec, activated partial thromboplastin time (aptt) < 40 sec, fibrinogen >100 mg/dL, platelets >80 × 103 mL.
In hemodynamically unstable women (rapid pulse, falling blood pressure, with or without renal impairment) or if the bleeding occurs shortly in post-surgery (the so-called reactionary hemorrhage), it is desirable to return to the operating room [5, 6, 7, 8, 9].
A preoperative abdominal and pelvic ultrasound or CT scan is routinely required to visualize the source of bleeding as being intra- or retro-peritoneal, as well as adequate local examination without or under anesthesia. Moreover, the operative procedure should be mentally revised to identify any potential bleeding issue [9].
Surgical revision for postoperative bleeding may be performed transvaginally, laparoscopically, or both [5, 6, 7, 8, 9, 13, 14].
Postoperative hemorrhage from the vaginal vault recurrently originates from the vaginal artery in the lateral vaginal fornix or from one of its branches, since the lateral vaginal angle which includes the vaginal artery may not be accurately protected or turn into disligated [9, 13, 14]. Excessive vaginal bleeding needs to be objectively measured; since the vagina is a distensible organ, clots obstructing the vaginal introitus may lead to a large amount of blood accumulating and distending the vagina, subsequently covering the true significance of hemorrhage [9, 13, 14]. Vaginal bleeding can be controlled by clamping and ligating the bleeding point as well as by delayed-absorbable transfixion suturing of the vaginal mucosa and paravaginal tissue [9, 13, 14]. If such techniques are not enough or bleeding vessels have retracted, other tactics should be intended [8].
When no noticeable vaginal source, bleeding after abdominal or vaginal hysterectomy is traditionally treated by laparotomy or laparoscopy [7, 9]. While laparotomy is recommended in cases of intraperitoneal bleeding or unsuccessful conservative transvaginal treatment, operative laparoscopy is clearly indicated if the source of bleeding cannot be identified by the means of vaginal examination and/or if an intraabdominal bleeding source is suspected [7, 9, 13].
Post-surgery bleeding requires laparotomy in two situations.
Firstly, if the surgical hemostasis cannot be achieved transvaginally, laparotomy may be necessary [9].
Secondly, if the patient underwent an abdominal hysterectomy, the incision should be reopened, succeeding the following steps (i) clots and blood evacuation from the abdomen and pelvic area; (ii) searching of the potential bleeding sites, commencing with the most expected places; (iii) ligating, suturing, or clipping of the identified bleeding sites; (iv) verifying the ureteral integrity as high risk of ureteral damage during reoperation; and (v) closing second time after a completely dry abdomen and pelvis [9].
The laparoscopic approach to postoperative bleeding following laparoscopic hysterectomy, vaginal hysterectomy, or laparoscopic-assisted vaginal hysterectomy is an attractive alternative to the abdominal surgical approach in the majority of patients [6, 7, 9, 13]. The procedure can be used to adequately evaluate the pelvis and the abdominal wall, which is occasionally the source of hemorrhage after laparoscopic hysterectomy. Moreover, whether the bleeding is from the abdominal wall, the surgical pedicles, or the vaginal cuff, it can be managed laparoscopically [8, 9]. Evidently, hemostasis can be more easily obtained in laparoscopic surgery because of magnification, close inspection, routine use of suction irrigation, and bipolar coagulation [7, 9]. Besides, bipolar coagulation, a Foley catheter introduced in the port-site bleeding, or a collagen-fibrin agent can be used to achieve local hemostasis during laparoscopy [7, 9].
Following laparoscopic irrigation/suction using Ringer’s solution to clear the operative field, a combination of laparoscopic suturing using absorbable suture material and laparoscopic bipolar coagulation is commonly recommended [6, 8, 9]. Also, electrosurgery is effective in controlling bleeding during laparoscopic surgery. Furthermore, different forms of fibrin adhesive are tested in gynecologic open surgery in order to stop oozing hemorrhages after primary hemostatic treatment with a high efficacy rate (98%) [6]. Holub and Kliment reported successful treatment of hemorrhage from damaged tissue near important pelvic structures using the laparoscope to apply collagen fleece combined with fibrin glue [7, 17].
To avoid further risk of injury to the abdominal wall and to improve the recovery time from surgery,
Conversely, if the patient is reasonably stable and there is not abrupt early bleeding (based on the volume of blood in the abdomen or retroperitoneal space as estimated by ultrasound and the time from surgery), it seems realistic to try to identify the bleeding artery and embolize it by transcatheter interventional radiological techniques [2, 3, 4, 9, 10].
Arterial embolization remains an important minimally invasive option for the management of delayed postoperative hemorrhage [2, 3, 4, 8, 9, 18]. Transcatheter arterial embolization has been shown to be an effective tool for the management of postoperative hemorrhage after gynecologic laparoscopy, but also after abdominal and vaginal hysterectomy [8, 9]. Selective angiographic arterial embolization is a quite simple and safe procedure with a clinical success rate up to 90% in routine practice and usually a low complication rate less than 10%, including a mild postembolization syndrome with pain, fever, high leucocyte count related to vascular thrombosis and tissue necrosis [8, 9]. Bladder necrosis, vesicovaginal fistula, neuropathies as well as renal toxicity are uncommon, isolated side effects [9].
Arterial embolization technique comprises the following main steps—(i) identification of the site of bleeding by angiofluoroscopy if more than 2–3 mL/min bleeding rate; (ii) percutaneous catheterization of the femoral artery or, uncommonly, brachial artery under local anesthesia with retrograde direct access to the hypogastric artery; (iii) canulation of the hypogastric artery or specific collateral vessel if appropriate; (iv) injection of the embolization material under angiographic observation (metal coins, autologous clot, small pieces of gelfoam, small silastic spheres, subcutaneous tissue, or other hemostatic materials; (v) repeat angiography to demonstrate the occlusion of the bleeding vessel; (vi) remove of the catheter followed by careful monitoring for further bleeding [8, 9, 10].
Although second surgery is often the initial choice for postoperative hemorrhage, for a patient who is hemodynamically stable but is experiencing postoperative hemorrhage, transcatheter arterial embolization is a welcome alternative to a second surgery [8, 9]. However, if rapid access to interventional radiology is not available or if transcatheter arterial embolization is unsuccessful, laparoscopy can still be considered [8, 9]. Besides, a potential advantage of surgical management of postoperative hemorrhage over transcatheter arterial embolization is the ability to evacuate the hemoperitoneum, which may decrease postoperative pain, the risk of infection, and the risk of ileus [8, 9].
It is typical to expect some bleeding after hysterectomy in the 6–8 weeks following the procedure; the discharge may be red, brown, or pink. Bleeding should steadily decrease in the days and weeks following the surgery and should never be excessive at any point of recovery [18]. The exception is menstruation in women who have undergone a subtotal hysterectomy [18, 19]. In case of bleeding after hysterectomy, it is more likely to be of some pathologic cause instead of menstruation which needs to be ruled out [19].
However, a sudden and significant increase in bleeding during recovery should be considered abnormal. Points of concern comprise but are not limited to—bright red vaginal bleeding (indicating active bleed), temperature over 100.4°F, severe nausea or vomiting, increasing pelvic pain, a local complication such as redness, swelling, or drainage at the incision site as well as difficulty in urinating or pain with urination suggesting either an infection or a neurogenic bladder [18].
Delayed vaginal hemorrhage after laparoscopic supracervical hysterectomy usually requires emergent reoperation. Several studies have described continued cyclical bleeding from the cervical stump after supracervical hysterectomy in 0–25% of cases [20].
Effective interventions addressing hemorrhage after hysterectomy are needed to reduce women’s mortality worldwide.
Prior to hysterectomy, these women should be offered specific counseling and have a prospective plan for the management of their disease, developed by gynecologists of how their condition and hysterectomy interact. Prehysterectomy counseling services starting for all women planning this surgical intervention are a key part of hospital services and should be an integral part of the local health services network. They could be provided by general practitioners or specialist clinicians or surgeons, all of whom should be suitably trained or may require different management or specialized services before hysterectomy. There are special circumstances as congenital or acquired coagulation disorders that should be considered to evaluate by a thorough history and lab tests.
Professional interpretation services for women who do not speak English.
It is not clear how much the specific medical terminology is conveyed to the patient. Healthcare providers have to invest in technology, security, specialists, and translators to ensure healthcare becomes world-class. Medical tourism is growing each year. Romania provides the highest quality healthcare at the lowest price. Also, the cost of hysterectomy in Romania is lower than the same treatment in UK or UE. In developed countries as the USA, UE countries or Canada patients have to wait a long time for major surgeries. The cost involved in treating a patient depends upon factors like—type of hysterectomy needed, hospital and physician selected for it, and duration of staying.
Communication and referrals among professionals.
Good communication among professionals is essential. Referral between specialties involved should be rapid. They can use a variety of communication methods including—mobile phone, email, fax, Whatsapp, Instagram, Tik Tok, Facebook, etc. In many cases, junior trainees in the front line did not have proper support and need to have clear guidelines about when to seek senior help.
Women with serious medical conditions
They require immediate and appropriate multidisciplinary specialist care; women will require referral to tertiary or specialist medical centers for their preexisting medical or mental conditions before hysterectomy. Conditions that require prehysterectomy counseling and advice include—epilepsy, diabetes, asthma, congenital or known acquired cardiac disease, autoimmune disorders, renal and liver disease, obesity (BMI > 30), severe mental illness, or psychiatric conditions that require a change of medication, HIV infection. Women with potential serious underlying preexisting medical on mental health conditions should be immediately referred to appropriate specialist centers of expertise as soon as their symptoms develop.
Clinical training
All clinical staff must undertake regular training for the identification and management of serious disease conditions or potential emergencies or signs and symptoms of potentially life-threatening conditions, circulatory failure, severe hypertension or major hemorrhage, pyrexia >38°C, tachycardia >100 bpm, breathlessness. The local clinicians may be excellent at the management of severely ill women but must also accept written, documented, and audited courses. There should be a well-trained team of doctors for recording and charting investigations performed, obtaining quick results, ensuring that abnormal results are followed up promptly and have resulted in a better outcome.
Identifying and managing very sick women with critical illness before, during or after hysterectomy
In very acute situations, a team approach can be very healthful. The management of patients with an acute severe illness with circulatory failure, arterial hypertension, and major hemorrhage requires a team approach and help from the anesthetic and critical care services. There are some healthcare professionals who failed to manage crisis situations outside their immediate area of expertise; therefore, it is crucial to recognize their limitations and to know when and whom to call for another opinion once the patient was admitted to the hospital.
Coagulation factors, hematocrit, serum calcium, glucose, and electrolytes could be assessed every 120 minutes or after 10 U of transfusion; these lab tests are very helpful for the diagnosis of postoperative bleeding.
RCOG guidelines of the responsibilities of the consultant on call should be followed.
Bilateral hypogastric artery ligation can reduce blood loss to a minimum during hysterectomy [9].
Hypotensive anesthesia is also a safe and effective technique in reducing the circulation to the operative field [9].
Serious incident and women death reporting
Health professionals, senior or junior, must recognize an act on the signs and symptoms of potentially life-threatening conditions.
The evaluation of such a report must include clinicians from relevant disciplines (including anesthetics) who were not involved with the deaths. This report is recommended to be a requirement in the future.
The identification and act on women’s death should be reviewed as a serious incident and disseminated to all health professionals, junior or senior. Women’s deaths are generally underreported because of incorrect classification of cause.
Fatal hemorrhage can result from laceration of the external iliac vein or the hypogastric vein where they join together which are at risk of injury when the surgeon dissects between the distal common iliac artery, the psoas muscle, and the area of lumbosacral nerve trunks [9]. These vessels cannot be clamped and ligated with clips or sutures [9].
Dissection around the aorta and vena cava done with inadequate exposure performed in order to remove lymph nodes around them can result in serious hemorrhage. Bleeding usually can be avoided by placing a finger over the laceration and a vascular needle is used to close the laceration from side to side. The same technique may be used for common and external iliac veins [9].
Also, bleeding can occur by dissecting pararectal space and presacral space as well as obturator fossa [9].
Pathology
Patient death autopsy must be improved and require more expertise.
In Romania, the number of women death after hysterectomy (death rate) is very small and many of the autopsies reviewed were considered adequate. When an autopsy is needed, the body can be taken to another area for more expert examination. Despite evaluation by many examiners in the different specialties, the final diagnosis could not be resolved because of inadequate clinical data, poor autopsy quality, or the unmanageable nature of some death.
The lack of routine observation in the postoperative period or a failure to appreciate blood loss or recognition of abnormal vital signs such as oxygen saturation and respiratory rate can lead to death after hysterectomy. The patient should be evaluated before hysterectomy for risk factors and the medical conditions of the women should be diagnosed by a careful history and lab tests in order to decrease the possibility of hemorrhage.
The risks of blood transfusion, the transmission of HIV or hepatitis B should be discussed before surgical procedure.
The peace of surgical intervention should be governed by good exposure of the tissue, accuracy of dissection, and clamping or suturing the vessels in a precise manner. The skills and experiences of the surgeon without wasting time with unnecessary hesitation or indecision will reduce the risk of uncontrolled hemorrhage after a hysterectomy.
The surgeon should control the life-threatening hemorrhage by judgment, knowledge, and technical skills. The patient’s medical history for vital signs, blood loss volume, and levels of coagulation factors will determine how quickly blood transfusion is initiated. Careful postoperative clinical evaluation of the patient by the surgeon and surgical team with abdominal or pelvic ultrasound or CT scanning will help to prevent or minimize significant blood loss after hysterectomy and localize the site of bleeding.
No funding was received for this chapter.
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The contents in this chapter include: (1) structures and governing equations of SRM; (2) some commonly used SRM converters; (3) estimation of key parameters and performance evaluation of SRM drive; (4) commutation scheme, current control scheme, and speed control scheme of SRM drive; (5) some commonly used front-end converters and their operation controls for SRM drive; (6) reversible and regenerative braking operation controls for SRM drive; (7) some tuning issues for SRM drive; (8) operation control and some tuning issues of switched-reluctance generators; and (9) experimental application exploration for SRM systems—(a) wind generator and microgrid and (b) EV SRM drive.",book:{id:"8899",slug:"modelling-and-control-of-switched-reluctance-machines",title:"Modelling and Control of Switched Reluctance Machines",fullTitle:"Modelling and Control of Switched Reluctance Machines"},signatures:"Chang-Ming Liaw, Min-Ze Lu, Ping-Hong Jhou and Kuan-Yu Chou",authors:[{id:"37616",title:"Prof.",name:"Chang-Ming",middleName:null,surname:"Liaw",slug:"chang-ming-liaw",fullName:"Chang-Ming Liaw"},{id:"306461",title:"Mr.",name:"Min-Ze",middleName:null,surname:"Lu",slug:"min-ze-lu",fullName:"Min-Ze Lu"},{id:"306463",title:"Mr.",name:"Ping-Hong",middleName:null,surname:"Jhou",slug:"ping-hong-jhou",fullName:"Ping-Hong Jhou"},{id:"306464",title:"Mr.",name:"Kuan-Yu",middleName:null,surname:"Chou",slug:"kuan-yu-chou",fullName:"Kuan-Yu Chou"}]},{id:"70874",title:"Social, Economic, and Environmental Impacts of Renewable Energy Resources",slug:"social-economic-and-environmental-impacts-of-renewable-energy-resources",totalDownloads:5016,totalCrossrefCites:27,totalDimensionsCites:54,abstract:"Conventional energy source based on coal, gas, and oil are very much helpful for the improvement in the economy of a country, but on the other hand, some bad impacts of these resources in the environment have bound us to use these resources within some limit and turned our thinking toward the renewable energy resources. The social, environmental, and economical problems can be omitted by use of renewable energy sources, because these resources are considered as environment-friendly, having no or little emission of exhaust and poisonous gases like carbon dioxide, carbon monooxide, sulfur dioxide, etc. Renewable energy is going to be an important source for power generation in near future, because we can use these resources again and again to produce useful energy. Wind power generation is considered as having lowest water consumption, lowest relative greenhouse gas emission, and most favorable social impacts. It is considered as one of the most sustainable renewable energy sources, followed by hydropower, photovoltaic, and then geothermal. As these resources are considered as clean energy resources, they can be helpful for the mitigation of greenhouse effect and global warming effect. Local employment, better health, job opportunities, job creation, consumer choice, improvement of life standard, social bonds creation, income development, demographic impacts, social bonds creation, and community development can be achieved by the proper usage of renewable energy system. Along with the outstanding advantages of these resources, some shortcomings also exist such as the variation of output due to seasonal change, which is the common thing for wind and hydroelectric power plant; hence, special design and consideration are required, which are fulfilled by the hardware and software due to the improvement in computer technology.",book:{id:"7636",slug:"wind-solar-hybrid-renewable-energy-system",title:"Wind Solar Hybrid Renewable Energy System",fullTitle:"Wind Solar Hybrid Renewable Energy System"},signatures:"Mahesh Kumar",authors:[{id:"309842",title:"Mr.",name:"Kamlesh",middleName:null,surname:"Kumar",slug:"kamlesh-kumar",fullName:"Kamlesh Kumar"}]}],onlineFirstChaptersFilter:{topicId:"11",limit:6,offset:0},onlineFirstChaptersCollection:[{id:"83116",title:"Investigations of Using an Intelligent ANFIS Modeling Approach for a Li-Ion Battery in MATLAB Implementation: Case Study",slug:"investigations-of-using-an-intelligent-anfis-modeling-approach-for-a-li-ion-battery-in-matlab-implem",totalDownloads:0,totalDimensionsCites:null,doi:"10.5772/intechopen.105529",abstract:"This research paper will propose an incentive topic to investigate the accuracy of an adaptive neuro-fuzzy modeling approach of lithium-ion (Li-ion) batteries used in hybrid electric vehicles and electric vehicles. Based on this adaptive neuro-fuzzy inference system (ANFIS) modeling approach, we will show its effectiveness and suitability for modeling the nonlinear dynamics of any process or control system. This new ANFIS modeling approach improves the original nonlinear battery model and an alternative linear autoregressive exogenous input (ARX) polynomial model. The alternative ARX is generated using the least square errors estimation method and is preferred for its simplicity and faster implementation since it uses typical functions from the MATLAB system identification toolbox. The ARX and ANFIS models’ effectiveness is proved by many simulations conducted on attractive MATLAB R2021b and Simulink environments. The simulation results reveal a high model accuracy in battery state of charge (SOC) and terminal voltage. An accurate battery model has a crucial impact on building a very precise adaptive extended Kalman filter (AEKF) SOC estimator. It is considered an appropriate case study of a third-order resistor-capacitor equivalent circuit model (3RC ECM) SAFT-type 6 Ah 11 V nominal voltage of Li-ion battery for simulation purposes.",book:{id:"11189",title:"Smart Mobility - Recent Advances, New Perspectives and Applications",coverURL:"https://cdn.intechopen.com/books/images_new/11189.jpg"},signatures:"Roxana-Elena Tudoroiu, Mohammed Zaheeruddin, Nicolae Tudoroiu and Sorin Mihai Radu"},{id:"83062",title:"Thermal Conductivity in Thermoelectric Materials",slug:"thermal-conductivity-in-thermoelectric-materials",totalDownloads:0,totalDimensionsCites:null,doi:"10.5772/intechopen.106168",abstract:"Thermal conductivity is a key parameter in identifying and developing alternative materials for many technological and temperature-critical applications, ranging from higher-temperature capability thermal barrier coatings to materials for thermoelectric conversion. The Figure of Merit (ZT) of a thermoelectric material (TE) is a function of the Seebeck coefficient (S), the electrical conductivity (σ), the total thermal conductivity (κ) and the absolute temperature (T). A highly-performing TE material should have high S and σ and low κ. Thermal conductivity has two contributions, the electronic (κE) and the lattice (κL). Various models have been developed to describe the lattice component of thermal conductivity. In this chapter, the models for the evaluation of lattice thermal conductivity will be explored, both phenomenological as well analytical models, taking into account the various phonon-scattering processes, with examples of real materials.",book:{id:"11516",title:"Updates on Thermoelectricity",coverURL:"https://cdn.intechopen.com/books/images_new/11516.jpg"},signatures:"Euripides Hatzikraniotis, George S. Polymeris and Theodora Kyratsi"},{id:"82992",title:"Adhesion Promoters for Gluing-Selected Materials in Furniture Industry",slug:"adhesion-promoters-for-gluing-selected-materials-in-furniture-industry",totalDownloads:0,totalDimensionsCites:null,doi:"10.5772/intechopen.106329",abstract:"Surface treatment with plasma, corona, or air and the use of adhesion promoters (primers) are methods that can be used to improve the gluability of various materials. Adhesion promoters based on organosilicone compounds from the solventborne and waterborne catalyzed by isocyanates were used in the study. Dispersions and hot melt adhesives based on various thermoplastic polymers were used. Rheological properties and surface-free energy as well as dispersion and polar shares in substrate-adhesion promoter systems were evaluated. The strength and resistance of glue lines were determined. The tested primers and adhesives were classified as rheostable liquids, diluted in shear, not showing the flow limit. Covering of the surfaces of PVC foils and ABS, PS, PVC edges with primers caused increase in surface-free energy, especially polar share. Significant improvement of strength and resistance of glue-lines was observed (100% delamination in the substrate).",book:{id:"11525",title:"Wood Industry - Past, Present and Future Outlook",coverURL:"https://cdn.intechopen.com/books/images_new/11525.jpg"},signatures:"Tomasz Krystofiak"},{id:"82998",title:"Dimensioning of Fractal Fracture on a Concrete Slab",slug:"dimensioning-of-fractal-fracture-on-a-concrete-slab",totalDownloads:1,totalDimensionsCites:null,doi:"10.5772/intechopen.105673",abstract:"What is presented here is a methodology that allows to study fractures in any material, especially in concrete elements. The importance lies in the moment in which the fracture that occurs in a structural element (slab in our case study) causes a negative effect on its structural behavior. Traditionally, its study is developed from the perspective of fracture mechanics, with which the energy at the tip of the crack or fracture is calculated, and it cannot go further. But the combination of the theories of fracture mechanics and fractal geometry allows us to obtain the patterns of its behavior in the future. Thus, the research was based on tests made on structural elements of concrete, from a slab led to structural failure and choosing a fracture. This was vectorized in order to obtain a fractal axis, which was called state 0, taking three parts or sections of that state and repeating them on a smaller scale. Subsequently, the research was based on five of the methods used for the study and calculation of the fractal dimension: box dimension, perimeter-area dimension, information dimension, mass dimension, and ruler dimension. Most of the fractal dimensions obtained under these methods were similar to each other.",book:{id:"11544",title:"Failure Analysis",coverURL:"https://cdn.intechopen.com/books/images_new/11544.jpg"},signatures:"Francisco Casanova-del-Angel"},{id:"83114",title:"Estimation of Equivalent Thermal Conductivity Value Using Correlation Relationships with Other Oil Reservoir Properties",slug:"estimation-of-equivalent-thermal-conductivity-value-using-correlation-relationships-with-other-oil-r",totalDownloads:2,totalDimensionsCites:0,doi:"10.5772/intechopen.106453",abstract:"In the exploitation of oil and gas reservoirs, thermal conductivity is the property of greatest importance in the application of secondary and tertiary oil fluid recovery techniques. This is why this property has been analyzed by estimating its value using several calculation models. But each model for calculating the value of this property is burdened by the fact that in the reservoir, the rocks are not like the chosen models (being made up of geological conglomerates with various inclusions). This paper presents a technique for estimating thermal conductivity (by energy transfer between overlying strata) and determining its value by a new calculation model. The paper also determined the thermal conductivity values for several rocks constituting some Romanian reservoirs, the aim of this material being to analyze the thermal behavior of rocks in condensed gas-rich areas.",book:{id:"11929",title:"Drilling Engineering and Technology - Recent Advances, New Perspectives and Applications",coverURL:"https://cdn.intechopen.com/books/images_new/11929.jpg"},signatures:"Chiș Timur, Jugastreanu Cristina and Renata Rădulescu"},{id:"83092",title:"Novel Composites for Bone Tissue Engineering",slug:"novel-composites-for-bone-tissue-engineering",totalDownloads:7,totalDimensionsCites:0,doi:"10.5772/intechopen.106255",abstract:"Novel metal oxide-doped fluorophosphates nano-glass powders were synthesized by melt quenching method, and their non-toxicity is proved by MTT. Their efficacy in bone formation is confirmed by osteocalcin and ALP secretion. Composites were made using PLA, PDLLA, PPF, or 1,2-diol with fluorophosphates nano-glass powders (AgFp/MgFp/ZnFp). Their non-toxicity was assessed by cell adhesion and MTT. The ability of the composite for bioconversion was assessed by RT-PCR estimation for osteocalcin, Collagen II, RUNX2, Chondroitin sulfate, and ALP secretion accessed by ELISA method. The animal study in rabbit showed good callus formation by bioconduction and bioinduction. The bioconversion of the composite itself was proved by modified Tetrachrome staining. From the 12 different composites with different composition, the composite PPF+PDLLA+PPF+ZnFp showed the best results. These obtained results of the composites made from common biological molecules are better than the standards and so they do biomimic as bone substitutes. The composites can be made as strips or granules or cylinders and will be a boon to the operating surgeon. The composite meets nearly all the requirements for bone tissue engineering and nullifies the defect in the existing ceramic composites.",book:{id:"11453",title:"Biomimetics - Bridging the Gap",coverURL:"https://cdn.intechopen.com/books/images_new/11453.jpg"},signatures:"Pugalanthipandian Sankaralingam, Poornimadevi Sakthivel and Vijayakumar Chinnaswamy Thangavel"}],onlineFirstChaptersTotal:278},preDownload:{success:null,errors:{}},subscriptionForm:{success:null,errors:{}},aboutIntechopen:{},privacyPolicy:{},peerReviewing:{},howOpenAccessPublishingWithIntechopenWorks:{},sponsorshipBooks:{sponsorshipBooks:[],offset:8,limit:8,total:0},allSeries:{pteSeriesList:[{id:"14",title:"Artificial Intelligence",numberOfPublishedBooks:11,numberOfPublishedChapters:91,numberOfOpenTopics:6,numberOfUpcomingTopics:0,issn:"2633-1403",doi:"10.5772/intechopen.79920",isOpenForSubmission:!0},{id:"7",title:"Biomedical Engineering",numberOfPublishedBooks:12,numberOfPublishedChapters:108,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2631-5343",doi:"10.5772/intechopen.71985",isOpenForSubmission:!0}],lsSeriesList:[{id:"11",title:"Biochemistry",numberOfPublishedBooks:33,numberOfPublishedChapters:333,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2632-0983",doi:"10.5772/intechopen.72877",isOpenForSubmission:!0},{id:"25",title:"Environmental Sciences",numberOfPublishedBooks:1,numberOfPublishedChapters:19,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2754-6713",doi:"10.5772/intechopen.100362",isOpenForSubmission:!0},{id:"10",title:"Physiology",numberOfPublishedBooks:14,numberOfPublishedChapters:145,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2631-8261",doi:"10.5772/intechopen.72796",isOpenForSubmission:!0}],hsSeriesList:[{id:"3",title:"Dentistry",numberOfPublishedBooks:11,numberOfPublishedChapters:144,numberOfOpenTopics:2,numberOfUpcomingTopics:0,issn:"2631-6218",doi:"10.5772/intechopen.71199",isOpenForSubmission:!0},{id:"6",title:"Infectious Diseases",numberOfPublishedBooks:13,numberOfPublishedChapters:124,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2631-6188",doi:"10.5772/intechopen.71852",isOpenForSubmission:!0},{id:"13",title:"Veterinary Medicine and Science",numberOfPublishedBooks:11,numberOfPublishedChapters:113,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2632-0517",doi:"10.5772/intechopen.73681",isOpenForSubmission:!0}],sshSeriesList:[{id:"22",title:"Business, Management and Economics",numberOfPublishedBooks:1,numberOfPublishedChapters:23,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2753-894X",doi:"10.5772/intechopen.100359",isOpenForSubmission:!0},{id:"23",title:"Education and Human Development",numberOfPublishedBooks:0,numberOfPublishedChapters:12,numberOfOpenTopics:1,numberOfUpcomingTopics:1,issn:null,doi:"10.5772/intechopen.100360",isOpenForSubmission:!0},{id:"24",title:"Sustainable Development",numberOfPublishedBooks:1,numberOfPublishedChapters:19,numberOfOpenTopics:5,numberOfUpcomingTopics:0,issn:"2753-6580",doi:"10.5772/intechopen.100361",isOpenForSubmission:!0}],testimonialsList:[{id:"13",text:"The collaboration with and support of the technical staff of IntechOpen is fantastic. The whole process of submitting an article and editing of the submitted article goes extremely smooth and fast, the number of reads and downloads of chapters is high, and the contributions are also frequently cited.",author:{id:"55578",name:"Antonio",surname:"Jurado-Navas",institutionString:null,profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bRisIQAS/Profile_Picture_1626166543950",slug:"antonio-jurado-navas",institution:{id:"720",name:"University of Malaga",country:{id:null,name:"Spain"}}}},{id:"6",text:"It is great to work with the IntechOpen to produce a worthwhile collection of research that also becomes a great educational resource and guide for future research endeavors.",author:{id:"259298",name:"Edward",surname:"Narayan",institutionString:null,profilePictureURL:"https://mts.intechopen.com/storage/users/259298/images/system/259298.jpeg",slug:"edward-narayan",institution:{id:"3",name:"University of Queensland",country:{id:null,name:"Australia"}}}}]},series:{item:{id:"13",title:"Veterinary Medicine and Science",doi:"10.5772/intechopen.73681",issn:"2632-0517",scope:"Paralleling similar advances in the medical field, astounding advances occurred in Veterinary Medicine and Science in recent decades. These advances have helped foster better support for animal health, more humane animal production, and a better understanding of the physiology of endangered species to improve the assisted reproductive technologies or the pathogenesis of certain diseases, where animals can be used as models for human diseases (like cancer, degenerative diseases or fertility), and even as a guarantee of public health. Bridging Human, Animal, and Environmental health, the holistic and integrative “One Health” concept intimately associates the developments within those fields, projecting its advancements into practice. This book series aims to tackle various animal-related medicine and sciences fields, providing thematic volumes consisting of high-quality significant research directed to researchers and postgraduates. It aims to give us a glimpse into the new accomplishments in the Veterinary Medicine and Science field. By addressing hot topics in veterinary sciences, we aim to gather authoritative texts within each issue of this series, providing in-depth overviews and analysis for graduates, academics, and practitioners and foreseeing a deeper understanding of the subject. Forthcoming texts, written and edited by experienced researchers from both industry and academia, will also discuss scientific challenges faced today in Veterinary Medicine and Science. In brief, we hope that books in this series will provide accessible references for those interested or working in this field and encourage learning in a range of different topics.",coverUrl:"https://cdn.intechopen.com/series/covers/13.jpg",latestPublicationDate:"August 17th, 2022",hasOnlineFirst:!0,numberOfPublishedBooks:11,editor:{id:"38652",title:"Prof.",name:"Rita",middleName:null,surname:"Payan-Carreira",slug:"rita-payan-carreira",fullName:"Rita Payan-Carreira",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bRiFPQA0/Profile_Picture_1614601496313",biography:"Rita Payan Carreira earned her Veterinary Degree from the Faculty of Veterinary Medicine in Lisbon, Portugal, in 1985. She obtained her Ph.D. in Veterinary Sciences from the University of Trás-os-Montes e Alto Douro, Portugal. After almost 32 years of teaching at the University of Trás-os-Montes and Alto Douro, she recently moved to the University of Évora, Department of Veterinary Medicine, where she teaches in the field of Animal Reproduction and Clinics. Her primary research areas include the molecular markers of the endometrial cycle and the embryo–maternal interaction, including oxidative stress and the reproductive physiology and disorders of sexual development, besides the molecular determinants of male and female fertility. She often supervises students preparing their master's or doctoral theses. She is also a frequent referee for various journals.",institutionString:null,institution:{name:"University of Évora",institutionURL:null,country:{name:"Portugal"}}},editorTwo:null,editorThree:null},subseries:{paginationCount:3,paginationItems:[{id:"19",title:"Animal Science",coverUrl:"https://cdn.intechopen.com/series_topics/covers/19.jpg",isOpenForSubmission:!0,editor:{id:"259298",title:"Dr.",name:"Edward",middleName:null,surname:"Narayan",slug:"edward-narayan",fullName:"Edward Narayan",profilePictureURL:"https://mts.intechopen.com/storage/users/259298/images/system/259298.jpeg",biography:"Dr. Edward Narayan graduated with Ph.D. degree in Biology from the University of the South Pacific and pioneered non-invasive reproductive and stress endocrinology tools for amphibians - the novel development and validation of non-invasive enzyme immunoassays for the evaluation of reproductive hormonal cycle and stress hormone responses to environmental stressors. \nDr. Narayan leads the Stress Lab (Comparative Physiology and Endocrinology) at the University of Queensland. A dynamic career research platform which is based on the thematic areas of comparative vertebrate physiology, stress endocrinology, reproductive endocrinology, animal health and welfare, and conservation biology. \nEdward has supervised 40 research students and published over 60 peer reviewed research.",institutionString:null,institution:{name:"University of Queensland",institutionURL:null,country:{name:"Australia"}}},editorTwo:null,editorThree:null},{id:"20",title:"Animal Nutrition",coverUrl:"https://cdn.intechopen.com/series_topics/covers/20.jpg",isOpenForSubmission:!0,editor:{id:"175967",title:"Dr.",name:"Manuel",middleName:null,surname:"Gonzalez Ronquillo",slug:"manuel-gonzalez-ronquillo",fullName:"Manuel Gonzalez Ronquillo",profilePictureURL:"https://mts.intechopen.com/storage/users/175967/images/system/175967.png",biography:"Dr. Manuel González Ronquillo obtained his doctorate degree from the University of Zaragoza, Spain, in 2001. He is a research professor at the Faculty of Veterinary Medicine and Animal Husbandry, Autonomous University of the State of Mexico. He is also a level-2 researcher. He received a Fulbright-Garcia Robles fellowship for a postdoctoral stay at the US Dairy Forage Research Center, Madison, Wisconsin, USA in 2008–2009. He received grants from Alianza del Pacifico for a stay at the University of Magallanes, Chile, in 2014, and from Consejo Nacional de Ciencia y Tecnología (CONACyT) to work in the Food and Agriculture Organization’s Animal Production and Health Division (AGA), Rome, Italy, in 2014–2015. He has collaborated with researchers from different countries and published ninety-eight journal articles. He teaches various degree courses in zootechnics, sheep production, and agricultural sciences and natural resources.\n\nDr. Ronquillo’s research focuses on the evaluation of sustainable animal diets (StAnD), using native resources of the region, decreasing carbon footprint, and applying meta-analysis and mathematical models for a better understanding of animal production.",institutionString:null,institution:{name:"Universidad Autónoma del Estado de México",institutionURL:null,country:{name:"Mexico"}}},editorTwo:null,editorThree:null},{id:"28",title:"Animal Reproductive Biology and Technology",coverUrl:"https://cdn.intechopen.com/series_topics/covers/28.jpg",isOpenForSubmission:!0,editor:{id:"177225",title:"Prof.",name:"Rosa Maria Lino Neto",middleName:null,surname:"Pereira",slug:"rosa-maria-lino-neto-pereira",fullName:"Rosa Maria Lino Neto Pereira",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bS9wkQAC/Profile_Picture_1624519982291",biography:"Rosa Maria Lino Neto Pereira (DVM, MsC, PhD and) is currently a researcher at the Genetic Resources and Biotechnology Unit of the National Institute of Agrarian and Veterinarian Research (INIAV, Portugal). She is the head of the Reproduction and Embryology Laboratories and was lecturer of Reproduction and Reproductive Biotechnologies at Veterinary Medicine Faculty. She has over 25 years of experience working in reproductive biology and biotechnology areas with a special emphasis on embryo and gamete cryopreservation, for research and animal genetic resources conservation, leading research projects with several peer-reviewed papers. Rosa Pereira is member of the ERFP-FAO Ex situ Working Group and of the Management Commission of the Portuguese Animal Germplasm Bank.",institutionString:"The National Institute for Agricultural and Veterinary Research. Portugal",institution:null},editorTwo:null,editorThree:null}]},overviewPageOFChapters:{paginationCount:21,paginationItems:[{id:"83115",title:"Fungi and Oomycetes–Allies in Eliminating Environmental Pathogens",doi:"10.5772/intechopen.106498",signatures:"Iasmina Luca",slug:"fungi-and-oomycetes-allies-in-eliminating-environmental-pathogens",totalDownloads:0,totalCrossrefCites:0,totalDimensionsCites:null,authors:null,book:{title:"Animal Welfare - New Insights",coverURL:"https://cdn.intechopen.com/books/images_new/11579.jpg",subseries:{id:"19",title:"Animal Science"}}},{id:"82991",title:"Diseases of the Canine Prostate Gland",doi:"10.5772/intechopen.105835",signatures:"Sabine Schäfer-Somi",slug:"diseases-of-the-canine-prostate-gland",totalDownloads:8,totalCrossrefCites:0,totalDimensionsCites:0,authors:null,book:{title:"Recent Advances in Canine Medicine",coverURL:"https://cdn.intechopen.com/books/images_new/11580.jpg",subseries:{id:"19",title:"Animal Science"}}},{id:"82956",title:"Potential Substitutes of Antibiotics for Swine and Poultry Production",doi:"10.5772/intechopen.106081",signatures:"Ho Trung Thong, Le Nu Anh Thu and Ho Viet Duc",slug:"potential-substitutes-of-antibiotics-for-swine-and-poultry-production",totalDownloads:4,totalCrossrefCites:0,totalDimensionsCites:0,authors:null,book:{title:"Antibiotics and Probiotics in Animal Food - Impact and Regulation",coverURL:"https://cdn.intechopen.com/books/images_new/11578.jpg",subseries:{id:"20",title:"Animal Nutrition"}}},{id:"82905",title:"A Review of Application Strategies and Efficacy of Probiotics in Pet Food",doi:"10.5772/intechopen.105829",signatures:"Heather Acuff and Charles G. Aldrich",slug:"a-review-of-application-strategies-and-efficacy-of-probiotics-in-pet-food",totalDownloads:16,totalCrossrefCites:0,totalDimensionsCites:0,authors:null,book:{title:"Antibiotics and Probiotics in Animal Food - Impact and Regulation",coverURL:"https://cdn.intechopen.com/books/images_new/11578.jpg",subseries:{id:"20",title:"Animal Nutrition"}}}]},overviewPagePublishedBooks:{paginationCount:11,paginationItems:[{type:"book",id:"7233",title:"New Insights into Theriogenology",subtitle:null,coverURL:"https://cdn.intechopen.com/books/images_new/7233.jpg",slug:"new-insights-into-theriogenology",publishedDate:"December 5th 2018",editedByType:"Edited by",bookSignature:"Rita Payan-Carreira",hash:"74f4147e3fb214dd050e5edd3aaf53bc",volumeInSeries:1,fullTitle:"New Insights into Theriogenology",editors:[{id:"38652",title:"Prof.",name:"Rita",middleName:null,surname:"Payan-Carreira",slug:"rita-payan-carreira",fullName:"Rita Payan-Carreira",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bRiFPQA0/Profile_Picture_1614601496313",biography:"Rita Payan Carreira earned her Veterinary Degree from the Faculty of Veterinary Medicine in Lisbon, Portugal, in 1985. She obtained her Ph.D. in Veterinary Sciences from the University of Trás-os-Montes e Alto Douro, Portugal. After almost 32 years of teaching at the University of Trás-os-Montes and Alto Douro, she recently moved to the University of Évora, Department of Veterinary Medicine, where she teaches in the field of Animal Reproduction and Clinics. Her primary research areas include the molecular markers of the endometrial cycle and the embryo–maternal interaction, including oxidative stress and the reproductive physiology and disorders of sexual development, besides the molecular determinants of male and female fertility. She often supervises students preparing their master's or doctoral theses. She is also a frequent referee for various journals.",institutionString:null,institution:{name:"University of Évora",institutionURL:null,country:{name:"Portugal"}}}]},{type:"book",id:"7144",title:"Veterinary Anatomy and Physiology",subtitle:null,coverURL:"https://cdn.intechopen.com/books/images_new/7144.jpg",slug:"veterinary-anatomy-and-physiology",publishedDate:"March 13th 2019",editedByType:"Edited by",bookSignature:"Catrin Sian Rutland and Valentina Kubale",hash:"75cdacb570e0e6d15a5f6e69640d87c9",volumeInSeries:2,fullTitle:"Veterinary Anatomy and Physiology",editors:[{id:"202192",title:"Dr.",name:"Catrin",middleName:null,surname:"Rutland",slug:"catrin-rutland",fullName:"Catrin Rutland",profilePictureURL:"https://mts.intechopen.com/storage/users/202192/images/system/202192.png",biography:"Catrin Rutland is an Associate Professor of Anatomy and Developmental Genetics at the University of Nottingham, UK. She obtained a BSc from the University of Derby, England, a master’s degree from Technische Universität München, Germany, and a Ph.D. from the University of Nottingham. She undertook a post-doctoral research fellowship in the School of Medicine before accepting tenure in Veterinary Medicine and Science. Dr. Rutland also obtained an MMedSci (Medical Education) and a Postgraduate Certificate in Higher Education (PGCHE). She is the author of more than sixty peer-reviewed journal articles, twelve books/book chapters, and more than 100 research abstracts in cardiovascular biology and oncology. She is a board member of the European Association of Veterinary Anatomists, Fellow of the Anatomical Society, and Senior Fellow of the Higher Education Academy. Dr. Rutland has also written popular science books for the public. https://orcid.org/0000-0002-2009-4898. www.nottingham.ac.uk/vet/people/catrin.rutland",institutionString:null,institution:{name:"University of Nottingham",institutionURL:null,country:{name:"United Kingdom"}}}]},{type:"book",id:"8524",title:"Lactation in Farm Animals",subtitle:"Biology, Physiological Basis, Nutritional Requirements, and Modelization",coverURL:"https://cdn.intechopen.com/books/images_new/8524.jpg",slug:"lactation-in-farm-animals-biology-physiological-basis-nutritional-requirements-and-modelization",publishedDate:"January 22nd 2020",editedByType:"Edited by",bookSignature:"Naceur M'Hamdi",hash:"2aa2a9a0ec13040bbf0455e34625504e",volumeInSeries:3,fullTitle:"Lactation in Farm Animals - Biology, Physiological Basis, Nutritional Requirements, and Modelization",editors:[{id:"73376",title:"Dr.",name:"Naceur",middleName:null,surname:"M'Hamdi",slug:"naceur-m'hamdi",fullName:"Naceur M'Hamdi",profilePictureURL:"https://mts.intechopen.com/storage/users/73376/images/system/73376.jpg",biography:"Naceur M’HAMDI is Associate Professor at the National Agronomic Institute of Tunisia, University of Carthage. 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He worked as a post-doctoral fellow at the Public Health Research Institute (PHRI), Newark, NJ for four years before accepting a three-year faculty position at Brigham Young University-Hawaii. Dr. Engohang-Ndong is a tenured faculty member with the academic rank of Full Professor at Kent State University, Ohio, where he teaches a wide range of biological science courses and pursues his research in medical and environmental microbiology. Recently, he expanded his research interest to epidemiology and biostatistics of chronic diseases in Gabon.",institutionString:"Kent State University",institution:{name:"Kent State University",country:{name:"United States of America"}}},{id:"188773",title:"Prof.",name:"Emmanuel",middleName:null,surname:"Drouet",slug:"emmanuel-drouet",fullName:"Emmanuel Drouet",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/188773/images/system/188773.png",biography:"Emmanuel Drouet, PharmD, is a Professor of Virology at the Faculty of Pharmacy, the University Grenoble-Alpes, France. As a head scientist at the Institute of Structural Biology in Grenoble, Dr. Drouet’s research investigates persisting viruses in humans (RNA and DNA viruses) and the balance with our host immune system. He focuses on these viruses’ effects on humans (both their impact on pathology and their symbiotic relationships in humans). He has an excellent track record in the herpesvirus field, and his group is engaged in clinical research in the field of Epstein-Barr virus diseases. He is the editor of the online Encyclopedia of Environment and he coordinates the Universal Health Coverage education program for the BioHealth Computing Schools of the European Institute of Science.",institutionString:null,institution:{name:"Grenoble Alpes University",country:{name:"France"}}},{id:"131400",title:"Prof.",name:"Alfonso J.",middleName:null,surname:"Rodriguez-Morales",slug:"alfonso-j.-rodriguez-morales",fullName:"Alfonso J. Rodriguez-Morales",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/131400/images/system/131400.png",biography:"Dr. Rodriguez-Morales is an expert in tropical and emerging diseases, particularly zoonotic and vector-borne diseases (especially arboviral diseases). He is the president of the Travel Medicine Committee of the Pan-American Infectious Diseases Association (API), as well as the president of the Colombian Association of Infectious Diseases (ACIN). He is a member of the Committee on Tropical Medicine, Zoonoses, and Travel Medicine of ACIN. He is a vice-president of the Latin American Society for Travel Medicine (SLAMVI) and a Member of the Council of the International Society for Infectious Diseases (ISID). Since 2014, he has been recognized as a Senior Researcher, at the Ministry of Science of Colombia. He is a professor at the Faculty of Medicine of the Fundacion Universitaria Autonoma de las Americas, in Pereira, Risaralda, Colombia. He is an External Professor, Master in Research on Tropical Medicine and International Health, Universitat de Barcelona, Spain. He is also a professor at the Master in Clinical Epidemiology and Biostatistics, Universidad Científica del Sur, Lima, Peru. In 2021 he has been awarded the “Raul Isturiz Award” Medal of the API. Also, in 2021, he was awarded with the “Jose Felix Patiño” Asclepius Staff Medal of the Colombian Medical College, due to his scientific contributions to COVID-19 during the pandemic. He is currently the Editor in Chief of the journal Travel Medicine and Infectious Diseases. His Scopus H index is 47 (Google Scholar H index, 68).",institutionString:"Institución Universitaria Visión de las Américas, Colombia",institution:null},{id:"332819",title:"Dr.",name:"Chukwudi Michael",middleName:"Michael",surname:"Egbuche",slug:"chukwudi-michael-egbuche",fullName:"Chukwudi Michael Egbuche",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/332819/images/14624_n.jpg",biography:"I an Dr. Chukwudi Michael Egbuche. I am a Senior Lecturer in the Department of Parasitology and Entomology, Nnamdi Azikiwe University, Awka.",institutionString:null,institution:{name:"Nnamdi Azikiwe University",country:{name:"Nigeria"}}},{id:"284232",title:"Mr.",name:"Nikunj",middleName:"U",surname:"Tandel",slug:"nikunj-tandel",fullName:"Nikunj Tandel",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/284232/images/8275_n.jpg",biography:'Mr. Nikunj Tandel has completed his Master\'s degree in Biotechnology from VIT University, India in the year of 2012. He is having 8 years of research experience especially in the field of malaria epidemiology, immunology, and nanoparticle-based drug delivery system against the infectious diseases, autoimmune disorders and cancer. He has worked for the NIH funded-International Center of Excellence in Malaria Research project "Center for the study of complex malaria in India (CSCMi)" in collaboration with New York University. The preliminary objectives of the study are to understand and develop the evidence-based tools and interventions for the control and prevention of malaria in different sites of the INDIA. Alongside, with the help of next-generation genomics study, the team has studied the antimalarial drug resistance in India. Further, he has extended his research in the development of Humanized mice for the study of liver-stage malaria and identification of molecular marker(s) for the Artemisinin resistance. At present, his research focuses on understanding the role of B cells in the activation of CD8+ T cells in malaria. Received the CSIR-SRF (Senior Research Fellow) award-2018, FIMSA (Federation of Immunological Societies of Asia-Oceania) Travel Bursary award to attend the IUIS-IIS-FIMSA Immunology course-2019',institutionString:"Nirma University",institution:{name:"Nirma University",country:{name:"India"}}},{id:"334383",title:"Ph.D.",name:"Simone",middleName:"Ulrich",surname:"Ulrich Picoli",slug:"simone-ulrich-picoli",fullName:"Simone Ulrich Picoli",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/334383/images/15919_n.jpg",biography:"Graduated in Pharmacy from Universidade Luterana do Brasil (1999), Master in Agricultural and Environmental Microbiology from Federal University of Rio Grande do Sul (2002), Specialization in Clinical Microbiology from Universidade de São Paulo, USP (2007) and PhD in Sciences in Gastroenterology and Hepatology (2012). She is currently an Adjunct Professor at Feevale University in Medicine and Biomedicine courses and a permanent professor of the Academic Master\\'s Degree in Virology. She has experience in the field of Microbiology, with an emphasis on Bacteriology, working mainly on the following topics: bacteriophages, bacterial resistance, clinical microbiology and food microbiology.",institutionString:null,institution:{name:"Universidade Feevale",country:{name:"Brazil"}}},{id:"229220",title:"Dr.",name:"Amjad",middleName:"Islam",surname:"Aqib",slug:"amjad-aqib",fullName:"Amjad Aqib",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/229220/images/system/229220.png",biography:"Dr. Amjad Islam Aqib obtained a DVM and MSc (Hons) from University of Agriculture Faisalabad (UAF), Pakistan, and a PhD from the University of Veterinary and Animal Sciences Lahore, Pakistan. Dr. Aqib joined the Department of Clinical Medicine and Surgery at UAF for one year as an assistant professor where he developed a research laboratory designated for pathogenic bacteria. Since 2018, he has been Assistant Professor/Officer in-charge, Department of Medicine, Manager Research Operations and Development-ORIC, and President One Health Club at Cholistan University of Veterinary and Animal Sciences, Bahawalpur, Pakistan. He has nearly 100 publications to his credit. His research interests include epidemiological patterns and molecular analysis of antimicrobial resistance and modulation and vaccine development against animal pathogens of public health concern.",institutionString:"Cholistan University of Veterinary and Animal Sciences",institution:{name:"University of Agriculture Faisalabad",country:{name:"Pakistan"}}},{id:"333753",title:"Dr.",name:"Rais",middleName:null,surname:"Ahmed",slug:"rais-ahmed",fullName:"Rais Ahmed",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/333753/images/20168_n.jpg",biography:null,institutionString:null,institution:{name:"University of Agriculture Faisalabad",country:{name:"Pakistan"}}},{id:"62900",title:"Prof.",name:"Fethi",middleName:null,surname:"Derbel",slug:"fethi-derbel",fullName:"Fethi Derbel",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/62900/images/system/62900.jpeg",biography:"Professor Fethi Derbel was born in 1960 in Tunisia. He received his medical degree from the Sousse Faculty of Medicine at Sousse, University of Sousse, Tunisia. He completed his surgical residency in General Surgery at the University Hospital Farhat Hached of Sousse and was a member of the Unit of Liver Transplantation in the University of Rennes, France. He then worked in the Department of Surgery at the Sahloul University Hospital in Sousse. Professor Derbel is presently working at the Clinique les Oliviers, Sousse, Tunisia. His hospital activities are mostly concerned with laparoscopic, colorectal, pancreatic, hepatobiliary, and gastric surgery. He is also very interested in hernia surgery and performs ventral hernia repairs and inguinal hernia repairs. He has been a member of the GREPA and Tunisian Hernia Society (THS). During his residency, he managed patients suffering from diabetic foot, and he was very interested in this pathology. For this reason, he decided to coordinate a book project dealing with the diabetic foot. Professor Derbel has published many articles in journals and collaborates intensively with IntechOpen Access Publisher as an editor.",institutionString:"Clinique les Oliviers",institution:null},{id:"300144",title:"Dr.",name:"Meriem",middleName:null,surname:"Braiki",slug:"meriem-braiki",fullName:"Meriem Braiki",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/300144/images/system/300144.jpg",biography:"Dr. Meriem Braiki is a specialist in pediatric surgeon from Tunisia. She was born in 1985. She received her medical degree from the University of Medicine at Sousse, Tunisia. She achieved her surgical residency training periods in Pediatric Surgery departments at University Hospitals in Monastir, Tunis and France.\r\nShe is currently working at the Pediatric surgery department, Sidi Bouzid Hospital, Tunisia. Her hospital activities are mostly concerned with laparoscopic, parietal, urological and digestive surgery. She has published several articles in diffrent journals.",institutionString:"Sidi Bouzid Regional Hospital",institution:null},{id:"229481",title:"Dr.",name:"Erika M.",middleName:"Martins",surname:"de Carvalho",slug:"erika-m.-de-carvalho",fullName:"Erika M. de Carvalho",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/229481/images/6397_n.jpg",biography:null,institutionString:null,institution:{name:"Oswaldo Cruz Foundation",country:{name:"Brazil"}}},{id:"186537",title:"Prof.",name:"Tonay",middleName:null,surname:"Inceboz",slug:"tonay-inceboz",fullName:"Tonay Inceboz",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/186537/images/system/186537.jfif",biography:"I was graduated from Ege University of Medical Faculty (Turkey) in 1988 and completed his Med. PhD degree in Medical Parasitology at the same university. I became an Associate Professor in 2008 and Professor in 2014. I am currently working as a Professor at the Department of Medical Parasitology at Dokuz Eylul University, Izmir, Turkey.\n\nI have given many lectures, presentations in different academic meetings. I have more than 60 articles in peer-reviewed journals, 18 book chapters, 1 book editorship.\n\nMy research interests are Echinococcus granulosus, Echinococcus multilocularis (diagnosis, life cycle, in vitro and in vivo cultivation), and Trichomonas vaginalis (diagnosis, PCR, and in vitro cultivation).",institutionString:"Dokuz Eylül University",institution:{name:"Dokuz Eylül University",country:{name:"Turkey"}}},{id:"71812",title:"Prof.",name:"Hanem Fathy",middleName:"Fathy",surname:"Khater",slug:"hanem-fathy-khater",fullName:"Hanem Fathy Khater",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/71812/images/1167_n.jpg",biography:"Prof. Khater is a Professor of Parasitology at Benha University, Egypt. She studied for her doctoral degree, at the Department of Entomology, College of Agriculture, Food and Natural Resources, University of Missouri, Columbia, USA. She has completed her Ph.D. degrees in Parasitology in Egypt, from where she got the award for “the best scientific Ph.D. dissertation”. She worked at the School of Biological Sciences, Bristol, England, the UK in controlling insects of medical and veterinary importance as a grant from Newton Mosharafa, the British Council. Her research is focused on searching of pesticides against mosquitoes, house flies, lice, green bottle fly, camel nasal botfly, soft and hard ticks, mites, and the diamondback moth as well as control of several parasites using safe and natural materials to avoid drug resistances and environmental contamination.",institutionString:null,institution:{name:"Banha University",country:{name:"Egypt"}}},{id:"99780",title:"Prof.",name:"Omolade",middleName:"Olayinka",surname:"Okwa",slug:"omolade-okwa",fullName:"Omolade Okwa",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/99780/images/system/99780.jpg",biography:"Omolade Olayinka Okwa is presently a Professor of Parasitology at Lagos State University, Nigeria. She has a PhD in Parasitology (1997), an MSc in Cellular Parasitology (1992), and a BSc (Hons) Zoology (1990) all from the University of Ibadan, Nigeria. She teaches parasitology at the undergraduate and postgraduate levels. She was a recipient of a Commonwealth fellowship supported by British Council tenable at the Centre for Entomology and Parasitology (CAEP), Keele University, United Kingdom between 2004 and 2005. She was awarded an Honorary Visiting Research Fellow at the same university from 2005 to 2007. \nShe has been an external examiner to the Department of Veterinary Microbiology and Parasitology, University of Ibadan, MSc programme between 2010 and 2012. She is a member of the Nigerian Society of Experimental Biology (NISEB), Parasitology and Public Health Society of Nigeria (PPSN), Science Association of Nigeria (SAN), Zoological Society of Nigeria (ZSN), and is Vice Chairperson of the Organisation of Women in Science (OWSG), LASU chapter. She served as Head of Department of Zoology and Environmental Biology, Lagos State University from 2007 to 2010 and 2014 to 2016. 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