Passive hemostats.
\r\n\t
",isbn:"978-1-83968-760-0",printIsbn:"978-1-83968-759-4",pdfIsbn:"978-1-83968-761-7",doi:null,price:0,priceEur:0,priceUsd:0,slug:null,numberOfPages:0,isOpenForSubmission:!1,hash:"cc49d6034d85f8f2e2890c6acc3cc629",bookSignature:"Dr. Abhijit Biswas",publishedDate:null,coverURL:"https://cdn.intechopen.com/books/images_new/10285.jpg",keywords:"Mott Insulators, Semi Metals, Polycrystals, Single Crystals, Electronic Properties, Magnetic Properties, PLD, MBE, Topological Insulators, Topological Hall Effect, Devices Applications, Catalysis",numberOfDownloads:null,numberOfWosCitations:0,numberOfCrossrefCitations:null,numberOfDimensionsCitations:null,numberOfTotalCitations:null,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"September 9th 2020",dateEndSecondStepPublish:"October 7th 2020",dateEndThirdStepPublish:"December 6th 2020",dateEndFourthStepPublish:"February 24th 2021",dateEndFifthStepPublish:"April 25th 2021",remainingDaysToSecondStep:"6 months",secondStepPassed:!0,currentStepOfPublishingProcess:5,editedByType:null,kuFlag:!1,biosketch:"A pioneering researcher in the field of tailoring metal oxide crystal surfaces and growth as well as engineering of thin films for various emergent phenomena and energy applications. Dr. Biswas received his Ph.D. from POSTECH, South Korea.",coeditorOneBiosketch:null,coeditorTwoBiosketch:null,coeditorThreeBiosketch:null,coeditorFourBiosketch:null,coeditorFiveBiosketch:null,editors:[{id:"194151",title:"Dr.",name:"Abhijit",middleName:null,surname:"Biswas",slug:"abhijit-biswas",fullName:"Abhijit Biswas",profilePictureURL:"https://mts.intechopen.com/storage/users/194151/images/system/194151.png",biography:"Dr. Abhijit Biswas is a research associate at the Indian Institute of Science Education and Research (IISER) Pune, in India. His research goal is to design and synthesize highest quality epitaxial heterostructures and superlattices, to play with their internal degrees of freedom to exploit the structure–property relationships, in order to find the next-generation multi-functional materials, in view of applications and of fundamental interest. His current research interest ranges from growth of novel perovskite oxides to non-oxides epitaxial films, down to its ultra-thin limit, to observe unforeseeable phenomena. He is also engaged in the growth of high quality epitaxial layered carbides and two-dimensional non-oxide thin films, to exploit the strain, dimension, and quantum confinement effect. His recent work also includes the metal-insulator transitions and magneto-transport phenomena in strong spin-orbit coupled epitaxial perovskite oxide thin films by reducing dimensionality as well as strain engineering. He is also extremely interested in the various energy related environment friendly future technological applications of thin films. In his early research career, he had also extensively worked on the tailoring of metal oxide crystal surfaces to obtain the atomic flatness with single terminating layer. Currently, he is also serving as a reviewer of several reputed peer-review journals.\nDr. Biswas received his B.Sc. in Physics from Kalyani University, followed by M.Sc in Physics (specialization in experimental condensed matter physics) from Indian Institute of Technology (IIT), Bombay. His Ph.D., also in experimental condensed matter physics, was awarded by POSTECH, South Korea for his work on the transport phenomena in perovskite oxide thin films. Before moving back to India as a national post-doctoral fellow, he was a post-doc at POSTECH working in the field of growth and characterizations of strong spin-orbit coupled metal oxide thin films.",institutionString:"Indian Institute of Science Education and Research Pune",position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"2",totalChapterViews:"0",totalEditedBooks:"0",institution:{name:"Indian Institute of Science Education and Research Pune",institutionURL:null,country:{name:"India"}}}],coeditorOne:null,coeditorTwo:null,coeditorThree:null,coeditorFour:null,coeditorFive:null,topics:[{id:"20",title:"Physics",slug:"physics"}],chapters:null,productType:{id:"1",title:"Edited Volume",chapterContentType:"chapter",authoredCaption:"Edited by"},personalPublishingAssistant:{id:"205697",firstName:"Kristina",lastName:"Kardum Cvitan",middleName:null,title:"Ms.",imageUrl:"https://mts.intechopen.com/storage/users/205697/images/5186_n.jpg",email:"kristina.k@intechopen.com",biography:"As an Author Service Manager my responsibilities include monitoring and facilitating all publishing activities for authors and editors. From chapter submission and review, to approval and revision, copyediting and design, until final publication, I work closely with authors and editors to ensure a simple and easy publishing process. I maintain constant and effective communication with authors, editors and reviewers, which allows for a level of personal support that enables contributors to fully commit and concentrate on the chapters they are writing, editing, or reviewing. I assist authors in the preparation of their full chapter submissions and track important deadlines and ensure they are met. I help to coordinate internal processes such as linguistic review, and monitor the technical aspects of the process. As an ASM I am also involved in the acquisition of editors. 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Venkateswarlu",coverURL:"https://cdn.intechopen.com/books/images_new/371.jpg",editedByType:"Edited by",editors:[{id:"58592",title:"Dr.",name:"Arun",surname:"Shanker",slug:"arun-shanker",fullName:"Arun Shanker"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"72",title:"Ionic Liquids",subtitle:"Theory, Properties, New Approaches",isOpenForSubmission:!1,hash:"d94ffa3cfa10505e3b1d676d46fcd3f5",slug:"ionic-liquids-theory-properties-new-approaches",bookSignature:"Alexander Kokorin",coverURL:"https://cdn.intechopen.com/books/images_new/72.jpg",editedByType:"Edited by",editors:[{id:"19816",title:"Prof.",name:"Alexander",surname:"Kokorin",slug:"alexander-kokorin",fullName:"Alexander Kokorin"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"314",title:"Regenerative Medicine and Tissue Engineering",subtitle:"Cells and Biomaterials",isOpenForSubmission:!1,hash:"bb67e80e480c86bb8315458012d65686",slug:"regenerative-medicine-and-tissue-engineering-cells-and-biomaterials",bookSignature:"Daniel Eberli",coverURL:"https://cdn.intechopen.com/books/images_new/314.jpg",editedByType:"Edited by",editors:[{id:"6495",title:"Dr.",name:"Daniel",surname:"Eberli",slug:"daniel-eberli",fullName:"Daniel Eberli"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"57",title:"Physics and Applications of Graphene",subtitle:"Experiments",isOpenForSubmission:!1,hash:"0e6622a71cf4f02f45bfdd5691e1189a",slug:"physics-and-applications-of-graphene-experiments",bookSignature:"Sergey Mikhailov",coverURL:"https://cdn.intechopen.com/books/images_new/57.jpg",editedByType:"Edited by",editors:[{id:"16042",title:"Dr.",name:"Sergey",surname:"Mikhailov",slug:"sergey-mikhailov",fullName:"Sergey Mikhailov"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"1373",title:"Ionic Liquids",subtitle:"Applications and Perspectives",isOpenForSubmission:!1,hash:"5e9ae5ae9167cde4b344e499a792c41c",slug:"ionic-liquids-applications-and-perspectives",bookSignature:"Alexander Kokorin",coverURL:"https://cdn.intechopen.com/books/images_new/1373.jpg",editedByType:"Edited by",editors:[{id:"19816",title:"Prof.",name:"Alexander",surname:"Kokorin",slug:"alexander-kokorin",fullName:"Alexander Kokorin"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"2270",title:"Fourier Transform",subtitle:"Materials Analysis",isOpenForSubmission:!1,hash:"5e094b066da527193e878e160b4772af",slug:"fourier-transform-materials-analysis",bookSignature:"Salih Mohammed Salih",coverURL:"https://cdn.intechopen.com/books/images_new/2270.jpg",editedByType:"Edited by",editors:[{id:"111691",title:"Dr.Ing.",name:"Salih",surname:"Salih",slug:"salih-salih",fullName:"Salih Salih"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}]},chapter:{item:{type:"chapter",id:"60538",title:"Retracted: Multiscale Stochastic Modeling Connects Cancer Drug Resistance Mechanisms to Population Survival Rates",doi:"10.5772/intechopen.76185",slug:"multiscale-stochastic-modeling-connects-cancer-drug-resistance-mechanisms-to-population-survival-rat",body:null,keywords:"cancer drug resistance, population survival, mathematical modeling",chapterPDFUrl:"https://cdn.intechopen.com/pdfs/60538.pdf",chapterXML:null,downloadPdfUrl:"/chapter/pdf-download/60538",previewPdfUrl:"/chapter/pdf-preview/60538",totalDownloads:421,totalViews:100,totalCrossrefCites:0,totalDimensionsCites:0,hasAltmetrics:0,dateSubmitted:"January 31st 2018",dateReviewed:"March 5th 2018",datePrePublished:"November 5th 2018",datePublished:"January 3rd 2019",dateFinished:"April 5th 2018",readingETA:"0",abstract:"Drug resistance significantly limits the long-term effectiveness of targeted therapeutics for cancer patients. Recent experimental studies have demonstrated that cancer cell heterogeneity and microenvironment adaptations to targeted therapy play important roles in promoting the rapid acquisition of drug resistance and in increasing cancer metastasis. The systematic development of effective therapeutics to overcome drug resistance mechanisms poses a major challenge. In this study, we used a modeling approach to connect cellular mechanisms underlying cancer drug resistance to population-level patient survival. To predict progression-free survival in cancer patients with metastatic melanoma, we developed a set of stochastic differential equations to describe the dynamics of heterogeneous cell populations while taking into account micro-environment adaptations. Clinical data on survival and circulating tumor cell DNA (ctDNA) concentrations were used to confirm the effectiveness of our model. Moreover, our model predicted distinct patterns of dose-dependent synergy when evaluating a combination of BRAF and MEK inhibitors versus a combination of BRAF and PI3K inhibitors. These predictions were consistent with the findings in previously reported studies. The impact of the drug metabolism rate on patient survival was also discussed. The proposed model might facilitate the quantitative evaluation and optimization of combination therapeutics and cancer clinical trial design.",reviewType:"peer-reviewed",bibtexUrl:"/chapter/bibtex/60538",risUrl:"/chapter/ris/60538",book:{slug:"cancer-survivorship"},signatures:"Xiaoqiang Sun",authors:[{id:"243333",title:"Dr.",name:"Xiaoqiang",middleName:null,surname:"Sun",fullName:"Xiaoqiang Sun",slug:"xiaoqiang-sun",email:"dongbusun@163.com",position:null,institution:null}],sections:null,chapterReferences:null,footnotes:null,contributors:null,corrections:null},book:{id:"7250",title:"Cancer Survivorship",subtitle:null,fullTitle:"Cancer Survivorship",slug:"cancer-survivorship",publishedDate:"January 3rd 2019",bookSignature:"Dil Afroze",coverURL:"https://cdn.intechopen.com/books/images_new/7250.jpg",licenceType:"CC BY 3.0",editedByType:"Edited 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Sun",authors:[{id:"243333",title:"Dr.",name:"Xiaoqiang",middleName:null,surname:"Sun",fullName:"Xiaoqiang Sun",slug:"xiaoqiang-sun"}]},{id:"62874",title:"Understanding the Anti-Tumor Properties Mediated by the Synthetic Peptide GK-1",slug:"understanding-the-anti-tumor-properties-mediated-by-the-synthetic-peptide-gk-1",totalDownloads:521,totalCrossrefCites:0,signatures:"Jacquelynne Cervantes-Torres, Laura Montero, Noé Rodríguez-Rodríguez, Edda Sciutto, Gladis Fragoso and Diana Torres-García",authors:[{id:"245785",title:"Ph.D.",name:"Edda",middleName:null,surname:"Sciutto",fullName:"Edda Sciutto",slug:"edda-sciutto"},{id:"260979",title:"MSc.",name:"Jacquelynne",middleName:null,surname:"Cervantes-Torres",fullName:"Jacquelynne Cervantes-Torres",slug:"jacquelynne-cervantes-torres"},{id:"260980",title:"MSc.",name:"Laura",middleName:null,surname:"Montero-León",fullName:"Laura 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Results",slug:"quality-of-life-following-intersphincteric-resections-for-low-rectal-cancer-early-results",totalDownloads:508,totalCrossrefCites:0,signatures:"Călin Molnar, Marian Botoncea, Claudiu Varlam Molnar and Vlad-Olimpiu Butiurca",authors:[{id:"247775",title:"Prof.",name:"Calin",middleName:null,surname:"Molnar",fullName:"Calin Molnar",slug:"calin-molnar"},{id:"257695",title:"Dr.",name:"Marian",middleName:null,surname:"Botoncea",fullName:"Marian Botoncea",slug:"marian-botoncea"},{id:"257696",title:"Dr.",name:"Vlad Olimpiu",middleName:null,surname:"Butiurca",fullName:"Vlad Olimpiu Butiurca",slug:"vlad-olimpiu-butiurca"},{id:"257699",title:"Dr.",name:"Claudiu Varlam",middleName:null,surname:"Molnar",fullName:"Claudiu Varlam Molnar",slug:"claudiu-varlam-molnar"}]},{id:"63915",title:"Actinic Papillary Fibroelastoma of the Left Ventricle",slug:"actinic-papillary-fibroelastoma-of-the-left-ventricle",totalDownloads:516,totalCrossrefCites:0,signatures:"Tomás Francisco Cianciulli and María Cristina Saccheri",authors:[{id:"256376",title:"Prof.",name:"Tomas",middleName:null,surname:"Cianciulli",fullName:"Tomas Cianciulli",slug:"tomas-cianciulli"}]}]},relatedBooks:[{type:"book",id:"8207",title:"Breast Cancer Biology",subtitle:null,isOpenForSubmission:!1,hash:"8f11a095792565a9ffb62eb68cc1aff7",slug:"breast-cancer-biology",bookSignature:"Dil Afroze, Bilal Rah, Shazia Ali, Faheem Shehjar, Mohd Ishaq Dar, Shailender S. Chauhan and Natasha Thakur",coverURL:"https://cdn.intechopen.com/books/images_new/8207.jpg",editedByType:"Edited by",editors:[{id:"244441",title:"Prof.",name:"Dil",surname:"Afroze",slug:"dil-afroze",fullName:"Dil Afroze"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"},chapters:[{id:"72259",title:"Cell Cycle and Factors Involved in Inhibition or Progression of Breast Cancer",slug:"cell-cycle-and-factors-involved-in-inhibition-or-progression-of-breast-cancer",signatures:"Shazia Ali, Mohd Ishaq Dar, Rafiq A. Rather and Dil Afroze",authors:[{id:"244441",title:"Prof.",name:"Dil",middleName:null,surname:"Afroze",fullName:"Dil Afroze",slug:"dil-afroze"},{id:"249300",title:"Dr.",name:"Shazia",middleName:null,surname:"Ali",fullName:"Shazia Ali",slug:"shazia-ali"}]},{id:"70265",title:"A Potential New Mechanism for Bisphenol Molecules to Initiate Breast Cancer through Alteration of Bone Morphogenetic Protein Signaling in Stem Cells and Their Microenvironment",slug:"a-potential-new-mechanism-for-bisphenol-molecules-to-initiate-breast-cancer-through-alteration-of-bo",signatures:"Boris Guyot and Veronique Maguer-Satta",authors:[null]},{id:"65715",title:"A Novel SASH1-IQGAP1-E-Cadherin Signal Cascade Mediates Breast Cancer Metastasis",slug:"a-novel-sash1-iqgap1-e-cadherin-signal-cascade-mediates-breast-cancer-metastasis",signatures:"Ding’an Zhou, Xing Zeng, Yadong Li, Zhixiong Wu and Xin Wan",authors:[{id:"269666",title:"Dr.",name:"Dingan",middleName:null,surname:"Zhou",fullName:"Dingan Zhou",slug:"dingan-zhou"}]},{id:"70123",title:"Evidence of BKCa Channelopathy-Driven Breast Cancer Metastasis to Brain",slug:"evidence-of-bk-sub-ca-sub-channelopathy-driven-breast-cancer-metastasis-to-brain",signatures:"Divya Khaitan and Nagendra Ningaraj",authors:[null]},{id:"65849",title:"Targeted Breast Cancer Treatment Using New Photochemotherapeutic Compounds",slug:"targeted-breast-cancer-treatment-using-new-photochemotherapeutic-compounds",signatures:"Ivan Sosthene Mfouo Tynga and Heidi Abrahamse",authors:[{id:"60947",title:"Prof.",name:"Heidi",middleName:null,surname:"Abrahamse",fullName:"Heidi Abrahamse",slug:"heidi-abrahamse"},{id:"235528",title:"Dr.",name:"Ivan",middleName:null,surname:"Mfouo-Tynga",fullName:"Ivan Mfouo-Tynga",slug:"ivan-mfouo-tynga"}]},{id:"67188",title:"Breast Cancer and Exercise",slug:"breast-cancer-and-exercise",signatures:"Deniz Kocamaz and Tülin Düger",authors:[null]}]}]},onlineFirst:{chapter:{type:"chapter",id:"72519",title:"Hemostasis and Biosurgicals in Trauma and Orthopedic Surgery",doi:"10.5772/intechopen.92805",slug:"hemostasis-and-biosurgicals-in-trauma-and-orthopedic-surgery",body:'There are a number of factors that influence patient outcome in trauma and orthopedic surgery in relation to hemorrhage. These can include patient factors, for example anticoagulant and antiplatelet medications, coagulopathies and other conditions, as well as surgical factors such as bony bleeding, large surgical incisions, diffuse venous bleeding and unseen sources of bleeding [1, 2].
Trauma still remains a leading worldwide cause of morbidity and mortality [3] and despite various developments over the years, hemorrhagic shock from trauma continues to form one part of the terrible triad contributing to mortality in both the military and civilian settings [4].
Effective hemostasis during surgery is advantageous to the surgeon as it prevents diffuse bleeding from capillaries and venules obscuring the surgical field and adding to operation time and infection risk [5, 6].
Significant blood loss has been associated with increased need for allogeneic and autologous blood transfusion [2, 7, 8]. These are associated with attendant risks including nosocomial infections [9], transfusion-related injury and fluid overload [10, 11]. In fact blood transfusion is an independent risk factor for infection, respiratory complications and the need for critical care support in traumatic injuries and resulted in a twofold increase in complications and critical care admissions, with more than two units of blood transfusion [7]. The risk of major perioperative complications is also increased with high intraoperative blood loss [2, 12, 13]. Therefore, patient outcome is optimal when the balance between bleeding and clotting is maintained during surgery such that tissue perfusion is adequate without excessive blood loss [5, 6].
Hemostasis in regard to trauma and surgery is a highly regulated process, maintaining flow through vessels at the same time as the thrombotic response to tissue damage is occurring [14], thereby ensuring tissue perfusion and limiting blood loss. The process is a complex interaction between vascular endothelium, platelets, the coagulation and fibrinolytic systems [15, 16].
Following injury, a temporary vascular smooth muscle contraction occurs in an attempt to stem blood flow. Endothelial disruption exposes the subendothelial layer and circulating Von Willebrand factor attaches to the site of injury. Surface glycoproteins also adhere to platelet surfaces. The subendothelial collagen activates adhering platelets and their surface receptors then bind circulating fibrinogen, forming a soft platelet plug comprising aggregated platelets and fibrinogen [14]. The adhering platelets secrete humoral factors including serotonin, prostaglandins and thromboxane that maintain a reduced blood flow, creating an environment that is conducive to clot formation at the site of bleeding. At the same time, circulating coagulating factors produced by the liver are activated in a series of precisely controlled sequential and dependant reactions [14, 17].
The final common pathway is the activation of thrombin that leads to conversion of soluble plasma fibrinogen to insoluble fibrin. The complex of activated factor XIII and fibrin results in cross-linking of fibrin monomers to form a stable clot [17].
Broadly speaking, there are mechanical, thermal, pharmacological and topical methods of hemorrhage control [2, 6, 8, 17, 18, 19, 20].
Mechanical methods include direct pressure, ligating clips and staples, sutures, fabric pads and gauze while hemostatic scalpels and lasers also reduce bleeding during surgery [6, 7, 17]. However, these methods have their drawbacks with respect to certain situations. The location of bleeding is particularly important with respect to orthopedics and in particular trauma. Bony surface bleeding and bleeding from the intramedullary canals are almost impossible to control with mechanical methods. Inflamed or friable tissues may contain a dense network of friable capillaries may prove a challenge [1, 2, 7]. Junctional bleeding in trauma may be potentially catastrophic and its control may not be amenable to the above methods.
The use of pharmacological methods can be a useful adjunct to other methods in these circumstances [7]. These may include epinephrine, desmopressin, tranexamic acid, vitamin K, aminocaproic acid and others.
In some situations though, even the above methods are ineffective or impractical [15] and hence the development of topical hemostatic agents. These are a diverse group of agents of varying composition and mechanisms of action. They can be versatile in the sense that when blood loss is minimal, they can be used sparingly and when there is severe blood loss then more liberal application could be an option [2]. They may be applied directly to the bleeding site and prevent or reduce continuous and unrelenting bleeding intraoperatively and postoperatively [2] and their topical nature broadly avoids the systemic adverse effects associated with systemic hemostatic medications including thrombosis [8].
Topical hemostasis is defined as a process that acts locally to stop bleeding from damaged vessels [21]. Recent and continuing developments have focused on agents that can be used as adjuncts to control bleeding during surgical procedures and control residual problematic bleeding if conventional methods fail. Broadly speaking, topical hemostats can be divided into three types [17, 20].
Passive—where the mechanism of action is to provide a physical scaffold around which platelets can aggregate. These act through contact activation and promote platelet aggregation so a clot can form. Examples include collagen, cellulose and gelatins.
Active—these have biological activity and their mechanism of action is actively influencing the clotting cascade to promote clot formation [17, 20]. These usually contain thrombin in one form or another [14].
Combined—combination of passive product with thrombin.
Contact activation occurs between receptors on platelets and collagen, promoting platelet aggregation [15, 17]. Preparation includes collagen sponges, pastes and powders [15, 17] and is obtained mainly from bovine sources [15], making it potentially immunogenic. In fact a 2–4% allergy in the total population to bovine collagen has been reported in the literature [22] (Table 1).
Hemostatic agent | Examples | Manufacturer |
---|---|---|
Collagen-based products | Avitene | Davol/BD BARD |
Helistat/Helitene | Integra Lifesciences | |
Instat/Ultrafoam | Ethicon. Johnson & Johnson | |
Oxidized cellulose | Surgicel Fibrillar | Ethicon, Johnson & Johnson |
Surgicel Nu-Knit | Ethicon, Johnson & Johnson | |
Gelatin-based products | Gelfoam | Pharmacia Corp, Pfizer |
Surgifoam | Johnson & Johnson | |
Polysaccharide spheres | Arista AH | BD BARD |
Passive hemostats.
The active ingredient in this product is oxidized regenerated cellulose (ORC). Its exact mechanism of action is poorly understood but contact activation is thought to play a part [15]. Often at reoperation, previously used ORC is visible, indicating reduced absorption and poor biodegradability, although this may be related to the amount used and the site of implantation [8]. For this reason, only the minimum possible amount to be used is indicated and it is recommended that the product be removed once hemostasis is achieved and before definitive closure [6, 8].
Their mechanism of action involves swelling while in contact with blood, providing a tamponade effect in confined spaces and restoring blood flow, and thereby producing a stable scaffold around which clots can form [17]. This does make it suitable for irregular wounds [6] and confined spaces [17]. However, it tends to stick to instruments when soaked with blood, making it difficult to handle and does not form a tight bond with the bleeding surface and can hence easily be dislodged [17].
Active agents have biological activity and actively participate in the coagulation cascade to induce clot formation at the site of bleeding [20]. They include thrombin, which comes into play in the last stages of the clotting cascade, converting circulating fibrinogen to a fibrin clot [17, 23]. Hence a significant advantage of thrombin is that its action is less susceptible to coagulopathies caused by clotting factor or platelet dysfunction [17]. Its activity constitutes the final steps in the clotting cascade and therefore it bypasses the initial steps in the cascade. Therefore, other aspects of the clotting cascade can be dysfunctional without significantly impairing the local hemostatic activity of thrombin [20].
Thrombin-based products are therefore excellent adjuncts in the presence of congenital and acquired coagulation and platelet disorders and in the presence of pharmacological and antiplatelet agents that are increasingly being used in the general population [5, 17]. Circulating fibrinogen is necessary for hemostasis to occur by active agents as thrombin converts it into insoluble fibrin that forms part of the clot. Therefore in rare cases of fibrinogen deficiency, clotting by thrombin-based products is impaired [17, 23].
These accomplish their action by bypassing the coagulation cascade to the final steps and converting fibrinogen to fibrin [24]. A fibrin precursor and thrombin stored in two separate adjacent syringes (dual syringe kit) with a single lumen enables delivery and mixing of these agents in the lumen and onto the surgical site, causing thrombin to cleave the fibrin precursor, resulting in fibrin monomers that polymerize at the site into a soluble mesh stabilized into a stable clot by factor XIII at the tissue surface [25]. Previously, bovine thrombin was used, which has recently been replaced by human thrombin [26] and more recently autologous human thrombin. Autologous fibrin sealants overcome the risk of allogeneic blood products, for example one is a patient-derived fibrin sealant utilizing the patient’s own blood as a source of fibrinogen and prothrombin and mixing it with an alkaline buffer solution to lower the pH, activating endogenous prothrombin [24] (Table 2).
Biosurgical | Examples | Manufacturer |
---|---|---|
Liquid fibrin adhesives | Tiseel | Baxter |
Evicel | Ethicon, Johnson & Johnson | |
Crosseal | Ethicon, Johnson & Johnson | |
Floseal | Baxter | |
Fibrin patches | Tachosil | Takeda |
Platelet gels | Vitagel | Orthovita |
Glutaraldehyde cross-linked albumin | BioGlue | Cryolife |
Sealants and adhesives.
These are a combination of thrombin, calcium and platelet-rich plasma, usually obtained from autologous sources using centrifugation systems that produce platelet-rich plasma. Platelets provide growth factors to stimulate wound healing and contribute to the strength of the clot [27].
These systems however rely on an intact coagulation system and may not be as effective in patients on antiplatelet or anticoagulant medications [27]. Also the extraction systems are expensive and there is a risk of contamination.
In addition to not requiring normal clotting mechanisms to work as mentioned before, active hemostats may offer other advantages. With many passive hemostatic agents, degeneration and reabsorption are a problem. This necessitates their removal from the surgical site prior to closure. With thrombin, this is not the case as degeneration and resorption of the resulting fibrin clot is achieved as part of wound healing [1, 8]. Thrombin and combination products also have a rapid onset of action with hemostasis being achieved within 10 min in most patients [7, 17, 28, 29]. Studies have shown that combining an active hemostat within a hemostatic product accelerates clotting. In a comparison of collagen-based products at different bleeding sites after surgical tumor resection, the combination of a collagen-thrombin product (n = 23) achieved complete hemostasis three times faster than the collagen sponge alone (n = 30). The median time to hemostasis was 78 seconds versus 243 seconds respectively (p < 0.001) [30]. Furthermore, approximately 80% achieved complete hemostasis within 2 min with an active topical hemostatic agent compared with only one-third of patients receiving a passive topical hemostatic agent [31]. Active hemostats are also very versatile and can come in various forms. These include sprays that can be advantageous in covering large bleeding surfaces quickly without the need for tamponade [31], and the concentration of thrombin in the formulation can also be varied depending on the severity and type of bleeding. Surgeons can use them in multiple ways during a single procedure due to their flexibility and range of delivery options [20]. Although bovine sources of thrombin may induce antibodies in hosts, this has not manifest itself as a major problem in the clinical setting [1, 32].
It has been shown that the terrible triad of hypothermia, coagulopathy and acidosis are associated with increased mortality in multiple trauma patients and that infection and multiple organ failure are other potential complications arising from severe blood loss [33, 34]. About a quarter of patients presenting to trauma centers have an established coagulopathy secondary to hemorrhage [35] with attendant risks of significant complications. Multiple defects in hemostasis can occur in combat injuries and as such, conventional methods of hemostasis may not be possible. Time is of the essence in these situations and non-transfusional approaches to hemostasis and the use of biosurgicals may be indicated [36, 37, 38, 39].
The combat setting has proved a challenging environment in many different ways in terms of management of hemorrhage. The tissue available for controlling life-threatening hemorrhage may be limited, the wound severity and the possibility of multiple injuries make the situation uniquely challenging [40]. Most combat injuries are penetrating in nature and a large proportion are limb wounds. Mortality from hemorrhage from these kinds of wounds is potentially preventable [36, 41, 42].
In the combat setting, the three principal sites of lethal hemorrhage are truncal (67%), junctional (19%) and extremity (14%). A report from the National Trauma Database suggests that the mortality from isolated lower limb extremity trauma with arterial injury is 2.8% with a 6.6% amputation rate [38]. Tourniquets can be used for these isolated injuries and their use in the military and civilian setting is supported by the Hartford consensus [39] and by the American College of Surgeons Committee on Trauma [38].
Junctional injuries (neck, axilla, groin and perineum) form a significant proportion of trauma in a combat setting and may damage the large vascular structures. These types of injuries are difficult to compress and are not amenable to tourniquet control [43, 44]. Topical hemostatic agents that have been developed in the last two decades [36, 45] can play a vital role in controlling severe bleeding in these situations and increase survival [33, 46] and have thus been listed as optional basic equipment for ambulances [39]. In addition, in a combat setting, more complex types of wound patterns are encountered than in a civilian setting, including blast injuries, which may be more amenable to topical hemostasis.
In 2003, USAIR [47] introduced guidelines of what should constitute the perfect hemostatic agent for use in the prehospital and battlefield settings [33, 41, 47, 48, 49] that included the following: being able to stop large vessel and arterial bleeding within 2 min of application, ability to be delivered through a pool of blood when applied, ready to use with no need for on-site preparation, simple enough to use by the wounded victim or a paramedic with minimal training, light weight and durable with a minimum 2-year shelf life in extreme environmental conditions, safe to use with no risk of injury to tissues or transmission of infection and inexpensive [41, 45, 50, 51]. In addition, hemostatic dressings need to be conformable and flexible enough due to the irregular shape, depth and wound configurations caused by modern explosive devices [40, 48].
These include gelatin [52], oxidized cellulose [53] and collagen and plant-derived polysaccharide spheres [54]. These agents are not biologically active and rely on the patients’ endogenous fibrin production for hemostasis. They provide a scaffold for platelet activation and aggregation, absorbing fluid several times their own weight to form a matrix at the site of hemorrhage, activating the extrinsic coagulation pathway and allowing clotting to occur. This makes them suitable only for patients in whom the coagulation system is intact [55, 56]. In fact in the absence of some coagulation factors, these agents may not be effective [53, 56]. They can be used as first line due to their ready availability and favorable cost-effectiveness, mostly as adjuncts with direct pressure at bleeding sites to control minimal residual hemorrhage [56].
These agents act by forming a physical matrix that stimulates platelet aggregation and degranulation to release factors that encourage clot formation [55].
Cellulose is a homopolysaccharide made by polymerization of glucopyranose molecules through glucosidic bonds. Surgical oxidized cellulose is either regenerated where organized fibers are formed prior to oxidation (regenerated ORC), or non-regenerated, with unorganized fibers prior to oxidation [55]. ORC conforms more rapidly to the surrounding environment. Surgical oxidized cellulose offers several favorable properties in hemostasis including bactericidal activity, good biocompatibility and ease of use [55]. It is usually resorbed but can take anywhere between 2 and 6 weeks depending on the amount used, the degree of saturation with blood and the tissue bed. The excess material may also cause foreign body reactions and granuloma formation without biodegradation and complicate radiological and clinical diagnoses of abscess, residual or recurrent tumor and granuloma [55, 57, 58]. For this reason, the minimal effective amount should be used and excess material removed prior to definitive closure. In addition, these products should not be used or left in place close to nerves, ureters, intestinal and vascular structures due to the risk of local inflammatory reactions and ischemia [55].
These can be used in combination with active agents such as thrombin in adhesives, or in a stand-alone manner. They are usually of bovine or porcine origin and act at the terminal stages of clotting to facilitate fibrin clot formation and are highly absorptive, forming a mechanical matrix for the clot to adhere to [55, 59]. They are quite versatile and available as sponges, powders or granules and are usually completely resorbed in 4–6 weeks [59]. It is important to use the minimum amount necessary to achieve hemostasis and to remove excess because part of the mechanism of action is swelling to cause a tamponade effect and this could potentially cause compression and necrosis in surrounding tissues if packed in tight spaces. This is particularly important around neural tissue and in bony spaces [59]. They are also useful in irregular wounds and surgical cavities as they can expand and fill these irregular spaces.
Mucoporous polysaccharide hemispheres are among a relatively new class of hemostatic agents derived from plant starch. Their mechanism of action includes absorbing water and the low-molecular weight components of blood, hence concentrating platelets and clotting factors in the vicinity, thereby enhancing local clotting processes [58, 60]. They have been used safely in cardiothoracic and neurospinal surgery.
These are active formulations containing mostly two agents—human purified fibrinogen and thrombin. They may also have added other compounds such as factor XIII, fibronectin and antifibrinolytics such as aprotinin used previously and tranexamic acid currently [61]. However, formulations without tranexamic acid or aprotinin are available to avoid hypersensitivity associated with aprotinin and neurotoxicity associated with tranexamic acid [62, 63] (Table 2).
These products are available in liquid or low-viscosity forms (fibrin glues) or as part of stiff collagen fleece (fibrin patches) [55]. Once applied, their mechanism of action is cleavage of fibrinogen to fibrin monomers by thrombin, which also activates factor XIII and the complex fibrin matrix forms the clot [55]. Calcium is required in both these steps and then the clot is eventually resorbed via the fibrinolytic pathway [25]. Generally, they connect atraumatically to tissues and form a barrier to leakage and bleeding through covalent polymerization between themselves and adjacent tissue [55]. Chiara et al. set out the properties of an sealant as being strong, rapid to adhere, flexible, sterile, without toxicity, biologically inert, biocompatible and able to be used in relatively wet environments with low thrombogenicity [55].
True sealants are of two types: synthetic (PEG-based or cyanoacrylates) [53, 60, 64, 65, 66, 67] or semisynthetic glutaraldehyde [68] (Table 2).
True sealants are cross-linking sealants that polymerize through nonenzymatic reactions, free of the need for the presence of blood or coagulation factors although some do have some coagulation factors within them. Both can be used to control residual ooze [53, 67].
PEG sealants are composed of polyethylene glycol and come in both flowing form as well as pads or fleeces. They should be avoided in kidney disease due to the renal clearance of polyethylene glycol and may contain allergenic components such as human albumin that can also lead to the theoretical risk of disease transmission [55].
Cyanoacrylates are products generally used for skin closure or lacerations in areas of low skin tension, for example scalp wounds. They are synthetic sealants that rapidly polymerize with water acting as the catalyst. There are two formulations: octyl-2-cyanocrylate and N-Butyl-2-cyanoacrylate. In a systematic review looking at octyl-2-cyanoacrylate, there were no differences in infections, wound dehiscence or cosmetic appearance when compared with other methods of closure [65]. Polymerization generates heat and therefore the amount used should be just enough and should certainly be avoided in delicate areas such as the spinal canal and neural tissue [55, 65]. Below the skin, a foreign body reaction may occur [65] and intravascular use is contraindicated due to the risk of systemic embolization [55].
Semisynthetic sealants otherwise known as bioglues are compounds of semisynthetic glutaraldehyde—bovine albumin-based sealant. Proteins on the surface of bleeding human tissue link with those of bovine albumin in the bioglue, causing a sealant effect [55]. Within synthetic graft materials, bioglue permeates interstices within the graft matrix [69], making it suitable for sealing anastomotic sites and decreasing postop bleeding [70].
These can be used as an adjunct to surgical hemostasis to improve residual moderate bleeding [55]. They are usually applied by double syringe systems. Each component is located in a separate section of the syringe, which then combine in a single lumen. They subsequently are applied using a blunt needle or spray tips in cases of large bleeding surface areas to the bleeding surgical site [25, 61]. Since the components bypass the initial steps in the extrinsic coagulation pathway, they can be used in achieving hemostasis in patients with congenital or acquired bleeding disorders such as hemophilia and patients on anticoagulants or antiplatelet medications [25, 62, 71] (Table 2).
They do have some drawbacks including the risk of thrombosis if injected intravascularly, hypotension and death and the risk of air embolization with the use of gas-driven sprayers [55]. In addition, the cost of sealants is significant and hence they are not recommended for use except in particular situations where indicated, for example in those with coagulation disorders [61]. One cost-effectiveness analysis done in the United Kingdom in patients undergoing total knee replacement on Quixil, one of the commercial brands, in addition to conventional hemostatic agents estimated that the use of a 5-ml dose of Quixil in addition to conventional hemostatic methods was cost saving in comparison to conventional methods alone. But the use of a 10-ml dose increased the cost substantially and they recommended that liquid fibrin adhesives only be used in selected cases [25]. They have however been found to be effective. Echave et al. [59] carried out a systematic review of 27 studies on the effectiveness of human gelatin-thrombin matrix sealant in different surgical fields including orthopedics. All 27 studies demonstrated that this sealant was associated with a significantly higher rate of successful hemostasis, and a shorter time to achieve it (p < 0.001) in comparison to other alternatives when conventional methods failed.
These products are also available as patches, for example Tachosil. They may have slightly different components but all of them have essentially the same mechanism of action, offering mechanical support with either collagen, oxidized cellulose/polyglactin 910 matrix, binding coagulation factors, allowing better adherence to bleeding tissue even in the presence of brisk bleeding, preventing the so-called “streaming effect” observed with fluid adhesives [72, 73, 74]. Tachosil is a ready-to-use fixed combination of equine collagen patch on one side and coated with coagulation factors, human fibrinogen and human thrombin on the other side [55]. Fibrin-pad and PGA-felt are absorbable hemostats composed of polyglactin 910, oxidized regenerated cellulose, thrombin and fibrinogen shown to be effective in a variety of tissue types [25, 72] and can rapidly achieve hemostasis in brisk bleeding in the retroperitoneum and pelvis, compared with the standard of care [72, 73] (Table 2).
Junctional hemorrhage is a significant problem in major trauma especially on the battlefield and often conventional methods such as tourniquets are ineffective [55]. In this respect, science has led to the development of products that are effective options in these circumstances and they can be divided into factor concentrators [75], procoagulants [76] and mucoadhesives [77] (Table 3).
Biosurgical | Examples | Manufacturer |
---|---|---|
Zeolite dressings | QuikClot & QuikClot ACS | Z-Medica |
Smectite dressings | WoundStat | TraumaCure Inc. |
Kaolin dressings | QuikClot Combat Gauze | Z-Medica |
Rapid Deployment Hemostat | Marine Polymer Technologies | |
Celox | Med Trade Products, UK | |
Trauma Stat | OreMedix | |
Fibrin dressings | Dry fibrin sealant dressing (DFSD) | American Red Cross |
Hemostatic dressings.
These are compounds of either zeolite (microporous crystalline aluminum silicate) or smectite (a nonmetallic clay mineral sodium, calcium and aluminum silicate). Examples include QuikClot (Z-Medica LLC, CT,USA) and QuikClot ACS (advanced clotting sponge), Traumadex (Medafor Inc., MN, USA) and self-expanding hemostatic polymer (SEHP) [35]. As the group name suggests these agents rapidly absorb the fluid content of blood. The resulting effect is an increase in relative concentration of its cellular and protein content and therefore clot formation. Water molecules are held in its pores by hydrogen bonds and this results in a relative local increase in concentration of platelets and clotting factors [35]. The first generation of QuikClot was designed as granules that were poured onto the bleeding wound. A high efficiency rate of 92% was demonstrated in a series of 103 patients in the military and civilian setting. There were eight patients in which hemorrhage was not effectively controlled with QC in coagulopathic patients where it was used as a last resort [75]. There were also some side effects of QC including intense exothermic reaction and scar formation from foreign body reaction [75]. Animal and early human studies on QC revealed thermal injury, poor biodegradability and foreign body reactions as the main drawbacks of QC [78, 79, 80]. In fact temperature generated by QuikClot in contact with aqueous components of blood at bleeding wounds has been measured to reach and average of 61°C with a potential rise to 76°C [78].
QuikClot has been compared to other hemostatic agents including HemCon (HemCon Medical Technologies Inc., OR, USA) in a military setting in multiple patients injured after explosions and gunshot wounds [81]. In this study, QC was effective but thermal injury was an issue. This has also been investigated in other studies by McMannus et al. [82] in the combat setting and evidence suggests that the greater the amount of blood and the more the QC applied, the greater is the risk of thermal injury. Thus currently it is only recommended for external use and the minimum amount required to achieve effective hemostasis is recommended.
QuikClot ACS is a newer generation of product made by larger zeolite beads packaged into mesh bags. This makes it easier to pack into cavities and irregular wounds often found on the battlefield and at junctional sites of hemorrhage and in cavities [55] and is claimed to produce much less of an exothermic reaction [75, 78] although there is a lack of studies with sufficient numbers to confirm this unequivocally [41].
Self-expanding hemostatic polymer (SEHP) is a dual action factor concentrator. Its mechanism of action results from its extremely potent absorptive capacity following absorption of the fluid component of blood and its ability to expand to conform to large irregular cavities and spaces, exerting a tamponade effect [35]. The other action is the effect of the polymer absorbing the liquid phase of blood into its matrix, thereby leading to a relative increase in concentration of platelets and coagulation factors at the site of bleeding, thereby promoting clotting [83, 84].
Woundstat is a compound of smectite granules that come in granular form. Its mechanism of action is absorption of the aqueous phase of blood, forming a clay substance that adheres to bleeding tissue and acts as a sealant and also concentrates clotting factors and blood cells locally, contributing to hemostasis. Granules are negatively charged and activate the intrinsic pathway as well [85, 86, 87].
These are products where the basic component is chitosan, which is a polymer derived from crustacean chitin. It is a complex biodegradable carbohydrate [55]. The mechanism of action appears to be related to highly positively charged chitosan interacting electronically with negatively charged cell membranes of erythrocytes. The product adheres strongly to tissues and seals bleeding wounds [77, 88, 89]. Examples include HemCon (HemCon Med Tech, Portland, OR) and Celox (Med. Trade Products, UK).
Celox is a chitosan-based adhesive, which is biodegradable and causes absorption of the aqueous phase and the advancement of red blood cell bonding. The positively charged Celox binds negatively charged red blood cells independently of the body’s clotting system, resulting in clot formation without the exothermic reaction associated with certain factor concentrators like QuikClot [35]. Its action is independent of the body’s clotting system, a property that makes it useful in patients requiring antiplatelet or anticoagulant medications or in the presence of coagulopathy and its local action means that it is not associated with distant clot formation. It is also reported to be very versatile, being available in granular and bandage forms and easy to remove from the wound after its clot formation activity is complete [49, 90, 91, 92]. HemCon, however, does have a hard consistency and is made in a square shape. Therefore, it works best on flat bleeding surfaces rather than deep irregular wounds [79, 83]. Wedmore et al. [77] looked at a series of patients with prehospital combative injuries where chitosan-based products had been used externally in chest, groin, buttock and abdominal wounds in 25 patients, 35 extremity wounds and neck and facial wounds in 4 cases. In about two-thirds of cases, the chitosan dressings were used following failure of hemostasis using only gauze with 100% success. In 97% of cases, bleeding stopped or hemostasis was improved, with failure only occurring in two cases attributed to blind stuffing of bandages into large cavitational injuries [77].
Trauma Stat is another chitosan-based derivative that was developed in collaboration with the United States Army, in which the mechanism of action involves positive charges in the amine groups on the chitosan molecule interacting with negative charges on the red blood cell membranes and in addition the adsorption of chitosan for fibrinogen and plasma proteins [79, 93].
Te Grotenhuis carried out a study of 66 patients in which conventional treatment with gauze and compression failed to control excessive bleeding or where conventional treatment was unlikely to achieve hemostasis. Complete cessation of hemorrhage including arterial hemorrhage occurred in 70% using the HemCon ChitoGauze, and reduction in hemorrhage occurred in 20% of patients despite 21 patients being on anticoagulants or having a clotting disorder and no adverse events occurred [88].
Due to the fact that chitosan is derived from crustaceans, there is a theoretical risk of allergenic reactions in patients allergic to shellfish. However in a study of 19 patients who had a positive IgE test to shellfish, none of the patients demonstrated a positive skin prick test to chitosan powder or expressed a reaction to HemCon bandage during serial bandage challenges, indicating favorable but not completely risk-free use of these products [94].
Chitosan-based dressings are also easy to remove after hemostasis has been achieved [41] and are known to have some antimicrobial properties [41, 95].
Their mechanism of action is mainly to deliver factors that promote coagulation into the bleeding wound. Examples are dry fibrin sealant dressing (DFSD) and QuikClot Combat Gauze (QCG) [70, 96, 97]. QCG is a surgical gauze coated with kaolin. On contact with injured endothelium, kaolin activates the extrinsic pathway, enhancing coagulation and promoting hemostasis. It is not degradable and needs to be removed from the wound following achievement of hemostasis [76].
Kaolin-based products have been used in a military setting and have demonstrated good results in both junctional and non-junctional hemorrhage [76]. In the above study, Shina et al. retrospectively reviewed 133 kaolin-based dressings applied to 122 military patients. 27% were for junctional hemorrhage with a success rate of 88% while the rest were extremity trauma where the success rate was 92%.
In addition to problems specific to certain types of hemostatic agents, there are also general drawbacks.
The hemostats that contain biological agents, usually the active hemostats, can be associated with the risk of disease transmission. For example, DFSD has the theoretical risk of viral disease transmission and hence has not achieved FDA approval.
Some agents have handling characteristics that are beneficial in certain situations. For example agents that have a granular nature can be used for complex irregular wounds with multiple bleeding points. However, the handling characteristics are difficult and they are difficult to apply in combat situations [89]. In addition, many agents are nonabsorbable and need to be removed after hemostasis is achieved. This may be difficult with some agents and require multiple washouts. Granular agents also have the potential to enter the vascular system and occlude the distal parts of vessels, causing endothelial injury and intravascular coagulation [41]. This has been demonstrated by Kheirabadi et al. [89] in their study, and for these reasons a bandage/gauze form of hemostatic agent is preferable as being safer for hemorrhage control, avoiding intravascular complications [38].
Any chapter on hemostasis in trauma and orthopedics is incomplete without the mention of tranexamic acid. This drug has been shown to be effective in reducing mortality due to bleeding in both the military and civilian setting.
The CRASH-2 (Clinical Randomization of an Antibrinolytic in Severe Hemorrhage-2) trial was a multicenter trial involving 40 centers looking at 20,211 adult trauma patients with significant bleeding who were randomized to two arms. One arm received TA within the first 3 hours of trauma and the other received placebo. The study demonstrated a reduction in mortality risk due to any cause from 14.5% compared with 16% in the placebo group (p < 0.001), with no increase in vasoocclusive events such as pulmonary embolism or myocardial infarction (0.3% versus 0.5% p-0.096) [98].
The MATTER (Military Application of Tranexamic Acid in Trauma) study looked at 896 patients with severe combat injuries and demonstrated a 6.5% absolute risk reduction in mortality in these patients with the use of tranexamic acid [99].
Both these studies have recommended incorporation of intravenous tranexamic acid into clinical practice [24].
Joint replacements are major procedures in elective orthopedics and can be associated with significant blood loss and increased transfusion requirements if appropriate steps are not taken to mitigate against this. In addition to the conventional methods of blood management including preoperative optimization, tourniquets if appropriate, intraoperative techniques such as cell saver and cauterization, topical and pharmacological hemostats and biosurgicals may offer some excellent solutions to reduce the transfusion requirements and achieve hemostasis.
A few studies have looked at human-derived fibrin sealants in total knee replacement [100, 101, 102]. A multicenter randomized control trial looking at 58 patients who underwent total knee replacement demonstrated a reduced postoperative blood loss, reduced postoperative decrease in hemoglobin and calculated blood loss in patients in whom fibrin sealant was used compared with that in the standard group (20% compared with the standard 83% p = 0.004) [100]. Another study that showed benefit was done by Dhillon et al. [25]. Results from other studies have been equivocal and have not demonstrated any clear difference.
In total hip arthroplasty, the use of fibrin sealants has been associated with reducing blood loss but inconsistent results have been demonstrated with regard to reduction in postoperative transfusion requirements [24, 103, 104, 105].
Multiple studies have looked at platelet gels in arthroplasty surgery. The evidence has been inconsistent in many. One randomized control trial looking at 100 total knee replacements did demonstrate significantly lower transfusion requirements in patients in whom platelet gels were used [106].
Desmopressin is a synthetic analog of anti-diuretic hormone. Its mechanism of action is to increase the levels of factor VIII and Von Willebrand factor, thereby enhancing primary hemostasis and platelet aggregation and adherence. This makes it suitable as a blood management strategy in patients with platelet dysfunction or other clotting disorders such as Von Willebrand’s disease and hemophilia A [107, 108]. It has also been used in healthy individuals for reducing postoperative bleeding in total hip and knee replacement surgery [109]. Six randomized placebo-controlled trials addressing the use of desmopressin in total hip and knee arthroplasty have been undertaken [110, 111, 112, 113, 114, 115]; however, evidence suggests that desmopressin is not significantly effective in reducing blood loss or transfusion requirements in these patients [24].
There are a number of good-quality randomized control trials that support the use of tranexamic acid in reducing blood loss and transfusion requirements in both knee and hip arthroplasty surgery [24]. There is however considerable amount of heterogeneity between the trials with regard to methods of delivery including single intravenous bolus dose, repeated boluses, prolonged infusion or intraarticular injection [116], and also differing dosing regimes [117]. In total knee arthroplasty, it has been shown that one intraoperative dose is sufficiently effective in reducing transfusion requirements and postoperative bleeding [118]. With the theoretical risk of intravascular thrombosis, intraarticular injection of tranexamic acid was investigated and compared to placebo and the studies showed reduction in blood loss but no reduction in transfusion rates [101, 119, 120]. Only one RCT by Seo et al. [121] showed a reduction in transfusion requirements with intraarticular (20%) rather than intravenous (34%) or placebo (94%). The evidence in total hip replacement with regard to intraarticular tranexamic acid is less convincing than in knee arthroplasty and more studies are needed.
With regard to aminocaproic acid, three RCTs did demonstrate benefit in hip and knee replacement surgery in terms of reducing blood loss in comparison with placebo. However, with regard to reducing transfusion requirements the evidence is much less convincing [24, 122, 123, 124].
Spine surgery presents a few unique challenges that limit the products that can be used for hemostasis in these situations. One of them is the friability of neural tissue and secondly the fact that the spinal cord and nerve roots are enclosed in rigid bony spaces that limit the kinds of hemostats that can be used due to the potential of swelling and compression of neural tissue in a rigid space. In addition, there is the potential for neurotoxicity with certain agents.
Cerebrospinal fluid leaks are a common source of postoperative morbidity in patients who have undergone spinal surgery. The morbidity burden includes severe postural headaches, vomiting, dizziness, photophobia, tinnitus, pseudomeningoceles and the risk of meningitis. It is therefore important that when dural tears occur or when an iatrogenic durotomy is created a water tight repair is essential. PEG hydrogel sealant has been found to be a safe effective way to augment dural closure and prevent these complications. A prospective study by Kim et al. [66] demonstrated that augmentation of standard dural closure techniques with this sealant in patients had significantly higher rates of watertight closure than with controls (100% and 64.3% respectively), without statistical differences in cerebrospinal fluid leaks, infections or wound healing. Complications due to swelling of polyethylene glycol and nerve compression were not demonstrated in this study but this remains a possibility. This led to the development of low-swell PEG hydrogel sealant (Duraseal) [55] and has been found to be safe and effective in a 3-to-1 randomized single-blind multicenter trial in which 100% of patients who had this low-swell formulation achieved watertight dural closure. Another study has also shown that BioGlue (semisynthetic glutaraldehyde-bovine albumin sealant) is safe and cost-effective in proximity to neurological structures despite previous concerns. Miscusi et al. [125] demonstrated a watertight dural closure in 23 patients requiring dural repair, with no incidence of neurological or infection related complications.
Collagen and gelatin-based products can be used to achieve hemostasis in spinal surgery. Xu et al. [64] carried out a study on 92 patients undergoing spinal fusion surgery and concluded that collagen-based products are superior to gelatin-based products in achieving hemostasis in spine surgery, with lower blood loss and postoperative drain volume.
Oxidized regenerated cellulose has been used for hemostasis in spine surgery. However when used around or in foramina with rigid bony walls, the swelling of small portions of the cellulose material may lead to significant mass effect and neural compression 1 day after surgery as demonstrated by Menovsky et al. [126] and may lead to rapid neurological deterioration. Therefore this material should be removed after hemostasis has been achieved prior to closure.
As mentioned before, liquid fibrin sealants can be used in spine surgery for hemostasis, but those containing tranexamic acid may be associated with neurotoxicity and should not be used if CSF leak or dural tear is present [55].
Topical hemostats and biosurgicals are a diverse group of compounds that have been developed and can be used in different situations as part of a comprehensive blood management program to limit the amount of blood loss. Trauma and orthopedics as a specialty also presents some unique challenges, with operations having significant blood loss and in trauma, junctional injuries on the battlefield with hemorrhage that is hard to control by conventional means. In addition, patients may be complex and frequently have platelet or coagulation disorders that preclude the use of certain classes of hemostatic agents. As mentioned before, these compounds are diverse, with different mechanisms of actions and indications, both in an elective and an emergency trauma setting. A comprehensive knowledge of these products is essential in modern-day trauma and orthopedic practice.
Despite recent developments, the perfect hemostatic or biosurgical agent still remains elusive and each of these products has their own drawbacks, side effects and unique indications and future research will hopefully continue to improve on these.
These Terms and Conditions outline the rules and regulations pertaining to the use of IntechOpen’s website www.intechopen.com and all the subdomains owned by IntechOpen located at 5 Princes Gate Court, London, SW7 2QJ, United Kingdom.
',metaTitle:"Terms and Conditions",metaDescription:"These terms and conditions outline the rules and regulations for the use of IntechOpen Website at https://intechopen.com and all its subdomains owned by Intech Limited located at 7th floor, 10 Lower Thames Street, London, EC3R 6AF, UK.",metaKeywords:null,canonicalURL:"/page/terms-and-conditions",contentRaw:'[{"type":"htmlEditorComponent","content":"By accessing the website at www.intechopen.com you are agreeing to be bound by these Terms of Service, all applicable laws and regulations, and agree that you are responsible for compliance with any applicable local laws. Use and/or access to this site is based on full agreement and compliance of these Terms. All materials contained on this website are protected by applicable copyright and trademark laws.
\\n\\nThe following terminology applies to these Terms and Conditions, Privacy Statement, Disclaimer Notice, and any or all Agreements:
\\n\\n“Client”, “Customer”, “You” and “Your” refers to you, the person accessing this website and accepting the Company’s Terms and Conditions;
\\n\\n“The Company”, “Ourselves”, “We”, “Our” and “Us”, refers to our Company, IntechOpen;
\\n\\n“Party”, “Parties”, or “Us”, refers to both the Client and ourselves, or either the Client or ourselves.
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\\n\\nAny use of the above terminology, or other words in the singular, plural, capitalization and/or he/she or they, are taken as interchangeable.
\\n\\nUnless otherwise stated, IntechOpen and/or its licensors own the intellectual property rights for all materials on www.intechopen.com. All intellectual property rights are reserved. You may view, download, share, link and print pages from www.intechopen.com for your own personal use, subject to the restrictions set out in these Terms and Conditions.
\\n\\nWe employ the use of cookies. By using the IntechOpen website you consent to the use of cookies in accordance with IntechOpen’s Privacy Policy. Most modern day interactive websites use cookies to enable the retrieval of user details for each visit. On our site, cookies are predominantly used to enable functionality and ease of use for those visiting the site.
\\n\\nIn no circumstances shall IntechOpen or its suppliers be liable for any damages (including, without limitation, damages for loss of data or profit, or due to business interruption) arising out of the use, or inability to use, the materials on IntechOpen's websites, even if IntechOpen or an IntechOpen authorized representative has been notified orally or in writing of the possibility of such damage. Some jurisdictions do not allow limitations on implied warranties, or limitations of liability for consequential or incidental damages; consequently, these limitations may not apply to you.
\\n\\nIntechopen.com website content and services are provided on an "AS IS" and an "AS AVAILABLE" basis. Material appearing on www.intechopen.com could include minor technical, typographical, or photographic errors. IntechOpen may make changes to any material contained on its website at any time without notice.
\\n\\nIntechOpen has no formal affiliation to any external sites that link to www.intechopen.com, unless otherwise specifically stated. As such, it is not responsible for content that appears on any such sites. The inclusion of any link to IntechOpen does not imply endorsement by IntechOpen. Use of any such linked website is done solely at the user's own discretion.
\\n\\nWe reserve the right of ownership over our entire website www.intechopen.com, and all contents. By using our services, you agree to remove all links to our website immediately upon request. We also reserve the right to amend these Terms and Conditions and our linking policy at any time. By continuing to link to our website, you agree to be bound to, and abide by, these linking Terms and Conditions.
\\n\\nIf you find any link on our website, or any linked website, objectionable for any reason, please Contact Us. We will consider all requests to remove links but will have no obligation to do so.
\\n\\nWithout prior approval and express written permission, you may not create frames around our web pages or use other techniques that alter in any way the visual presentation or appearance of our website.
\\n\\nIntechOpen may revise its Terms of Service for its website at any time without notice. By using this website, you are agreeing to be bound by the current version of all Terms at the time of use.
\\n\\nThese Terms and Conditions are governed by and construed in accordance with the laws of the United Kingdom and you irrevocably submit to the exclusive jurisdiction of the courts in London, United Kingdom.
\\n\\nCroatian version of Terms and Conditions available here
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\n\nThe following terminology applies to these Terms and Conditions, Privacy Statement, Disclaimer Notice, and any or all Agreements:
\n\n“Client”, “Customer”, “You” and “Your” refers to you, the person accessing this website and accepting the Company’s Terms and Conditions;
\n\n“The Company”, “Ourselves”, “We”, “Our” and “Us”, refers to our Company, IntechOpen;
\n\n“Party”, “Parties”, or “Us”, refers to both the Client and ourselves, or either the Client or ourselves.
\n\nAll Terms refer to the offer, acceptance, and consideration of payment necessary to provide assistance to the Client in the most appropriate manner, whether by formal meetings of a fixed duration, or by any other agreed means, for the express purpose of meeting the Client’s needs in respect of provision of the Company’s stated services/products, and in accordance with, and subject to, the prevailing laws of the United Kingdom.
\n\nAny use of the above terminology, or other words in the singular, plural, capitalization and/or he/she or they, are taken as interchangeable.
\n\nUnless otherwise stated, IntechOpen and/or its licensors own the intellectual property rights for all materials on www.intechopen.com. All intellectual property rights are reserved. You may view, download, share, link and print pages from www.intechopen.com for your own personal use, subject to the restrictions set out in these Terms and Conditions.
\n\nWe employ the use of cookies. By using the IntechOpen website you consent to the use of cookies in accordance with IntechOpen’s Privacy Policy. Most modern day interactive websites use cookies to enable the retrieval of user details for each visit. On our site, cookies are predominantly used to enable functionality and ease of use for those visiting the site.
\n\nIn no circumstances shall IntechOpen or its suppliers be liable for any damages (including, without limitation, damages for loss of data or profit, or due to business interruption) arising out of the use, or inability to use, the materials on IntechOpen's websites, even if IntechOpen or an IntechOpen authorized representative has been notified orally or in writing of the possibility of such damage. Some jurisdictions do not allow limitations on implied warranties, or limitations of liability for consequential or incidental damages; consequently, these limitations may not apply to you.
\n\nIntechopen.com website content and services are provided on an "AS IS" and an "AS AVAILABLE" basis. Material appearing on www.intechopen.com could include minor technical, typographical, or photographic errors. IntechOpen may make changes to any material contained on its website at any time without notice.
\n\nIntechOpen has no formal affiliation to any external sites that link to www.intechopen.com, unless otherwise specifically stated. As such, it is not responsible for content that appears on any such sites. The inclusion of any link to IntechOpen does not imply endorsement by IntechOpen. Use of any such linked website is done solely at the user's own discretion.
\n\nWe reserve the right of ownership over our entire website www.intechopen.com, and all contents. By using our services, you agree to remove all links to our website immediately upon request. We also reserve the right to amend these Terms and Conditions and our linking policy at any time. By continuing to link to our website, you agree to be bound to, and abide by, these linking Terms and Conditions.
\n\nIf you find any link on our website, or any linked website, objectionable for any reason, please Contact Us. We will consider all requests to remove links but will have no obligation to do so.
\n\nWithout prior approval and express written permission, you may not create frames around our web pages or use other techniques that alter in any way the visual presentation or appearance of our website.
\n\nIntechOpen may revise its Terms of Service for its website at any time without notice. By using this website, you are agreeing to be bound by the current version of all Terms at the time of use.
\n\nThese Terms and Conditions are governed by and construed in accordance with the laws of the United Kingdom and you irrevocably submit to the exclusive jurisdiction of the courts in London, United Kingdom.
\n\nCroatian version of Terms and Conditions available here
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