Principal used psychometric instruments for the assessment of bariatric candidates.
\\n\\n
Dr. Pletser’s experience includes 30 years of working with the European Space Agency as a Senior Physicist/Engineer and coordinating their parabolic flight campaigns, and he is the Guinness World Record holder for the most number of aircraft flown (12) in parabolas, personally logging more than 7,300 parabolas.
\\n\\nSeeing the 5,000th book published makes us at the same time proud, happy, humble, and grateful. This is a great opportunity to stop and celebrate what we have done so far, but is also an opportunity to engage even more, grow, and succeed. It wouldn't be possible to get here without the synergy of team members’ hard work and authors and editors who devote time and their expertise into Open Access book publishing with us.
\\n\\nOver these years, we have gone from pioneering the scientific Open Access book publishing field to being the world’s largest Open Access book publisher. Nonetheless, our vision has remained the same: to meet the challenges of making relevant knowledge available to the worldwide community under the Open Access model.
\\n\\nWe are excited about the present, and we look forward to sharing many more successes in the future.
\\n\\nThank you all for being part of the journey. 5,000 times thank you!
\\n\\nNow with 5,000 titles available Open Access, which one will you read next?
\\n\\nRead, share and download for free: https://www.intechopen.com/books
\\n\\n\\n\\n
\\n"}]',published:!0,mainMedia:null},components:[{type:"htmlEditorComponent",content:'
Preparation of Space Experiments edited by international leading expert Dr. Vladimir Pletser, Director of Space Training Operations at Blue Abyss is the 5,000th Open Access book published by IntechOpen and our milestone publication!
\n\n"This book presents some of the current trends in space microgravity research. The eleven chapters introduce various facets of space research in physical sciences, human physiology and technology developed using the microgravity environment not only to improve our fundamental understanding in these domains but also to adapt this new knowledge for application on earth." says the editor. Listen what else Dr. Pletser has to say...
\n\n\n\nDr. Pletser’s experience includes 30 years of working with the European Space Agency as a Senior Physicist/Engineer and coordinating their parabolic flight campaigns, and he is the Guinness World Record holder for the most number of aircraft flown (12) in parabolas, personally logging more than 7,300 parabolas.
\n\nSeeing the 5,000th book published makes us at the same time proud, happy, humble, and grateful. This is a great opportunity to stop and celebrate what we have done so far, but is also an opportunity to engage even more, grow, and succeed. It wouldn't be possible to get here without the synergy of team members’ hard work and authors and editors who devote time and their expertise into Open Access book publishing with us.
\n\nOver these years, we have gone from pioneering the scientific Open Access book publishing field to being the world’s largest Open Access book publisher. Nonetheless, our vision has remained the same: to meet the challenges of making relevant knowledge available to the worldwide community under the Open Access model.
\n\nWe are excited about the present, and we look forward to sharing many more successes in the future.
\n\nThank you all for being part of the journey. 5,000 times thank you!
\n\nNow with 5,000 titles available Open Access, which one will you read next?
\n\nRead, share and download for free: https://www.intechopen.com/books
\n\n\n\n
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\r\n\r\n\tThe main objectives of this book is to enable readers to have broad knowledge in both theoretical and practical skills in biomimetics; integrate fundamental and advanced applied knowledge with latest research development that helps solving complex interdisciplinary problems.
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Habib and Dr. César Martín-Gómez",publishedDate:null,coverURL:"https://cdn.intechopen.com/books/images_new/10372.jpg",keywords:"Biorobotics, Bionic, Biosensors, Bioactuators, Artificial Organs, Tissue Engineering, Structures and Functions, Actuators, Self-organizing Biomaterials, Biomaterial Synthesis and Design, Brain-Machine Interface, Cognitive Robotics",numberOfDownloads:568,numberOfWosCitations:0,numberOfCrossrefCitations:0,numberOfDimensionsCitations:0,numberOfTotalCitations:0,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"June 4th 2020",dateEndSecondStepPublish:"June 25th 2020",dateEndThirdStepPublish:"August 24th 2020",dateEndFourthStepPublish:"November 12th 2020",dateEndFifthStepPublish:"January 11th 2021",remainingDaysToSecondStep:"8 months",secondStepPassed:!0,currentStepOfPublishingProcess:5,editedByType:null,kuFlag:!1,biosketch:"Short term visiting professor at many universities around the world, Nagasaki University - Japan, Hokkaido University - Japan, Orebro University - Sweden, Norwegian University of Science and Technology - Norway among many others, he was a consultant and technical advisor to well-known international companies including Toyota group and ABB.",coeditorOneBiosketch:null,coeditorTwoBiosketch:null,coeditorThreeBiosketch:null,coeditorFourBiosketch:null,coeditorFiveBiosketch:null,editors:[{id:"80821",title:"Dr.",name:"Maki K.",middleName:null,surname:"Habib",slug:"maki-k.-habib",fullName:"Maki K. 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Then, he was an invited Professor at KAIST, South Korea, Visiting Professor at Saga University, Japan, and since Sept 2007 he is a full Professor of Robotics and Mechatronics and Director of the robotics, Control and Smart Systems master programs at AUC. Prof. Habib was a visiting professor (short term) at many Universities around the world, such as, Nagasaki University-Japan, Hokkoido University-Japan, Orebro University – Sweden, Norwegian University of Science and Technology – Norway, etc. Prof. Habib served as a consultant and Technical advisor to well-known international companies including Toyota group and ABB. He is a member of AUC Senate since 2012, member of Senate Executive committee since 2014 and Chair of the Senate Academic Affair committee since 2014. Prof. Habib is involved in national accreditation level and also ABET accreditation at the mechanical engineering department level. 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His main areas of research are focusing on human adaptive and friendly Mechatronics, Intelligent and autonomous robotics: Service and field robots for humanitarian demining, Control, mapping and navigation, Biomimetics and Bioinspiration, Biomedical robots, Telecooperation, Distributed teleoperation and collaborative control, Intelligent and nonlinear control, Wireless sensor networks and Ambient intelligence.",institutionString:"American University in Cairo",position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"0",totalChapterViews:"0",totalEditedBooks:"2",institution:{name:"American University in Cairo",institutionURL:null,country:{name:"Egypt"}}}],coeditorOne:{id:"76725",title:"Dr.",name:"César",middleName:null,surname:"Martín-Gómez",slug:"cesar-martin-gomez",fullName:"César Martín-Gómez",profilePictureURL:"https://mts.intechopen.com/storage/users/76725/images/system/76725.jpg",biography:"Dr. César Martín-Gómez is a Ph.D. Architect from the Universidad de Navarra (Spain). 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Before selecting the material, the analysis of requirements is carried out. The demand for using materials with the lowest density and good properties has been increasing for years [1, 2].
Currently trends in the development of techniques tend to reduce the weight of finished products, machines or constructions. This is dictated by ecology and reduced energy consumption. It also results in a growing interest in low-density materials, mainly magnesium and its alloys [1, 2, 3].
Magnesium is an element constituting 2.74% of the Earth’s crust. It occurs in most countries in the form of various compounds and minerals. The most common ores are dolomites (MgCO3·CaCO3) and magnesites (MgCO3). Another mineral used for the magnesium production is carnallite. Magnesium is also included in serpentine. Oceans are a rich source of magnesium, which contain approx. 0.13% of the metal in the salt solution as MgCl2 and MgSO4. In 1808, the electrolysis of molten salts allowed Humphrey Davy, an English chemist, to extract pure active metals for the first time, including magnesium [4, 5, 6].
A French chemist Antoine Bussy, on the other hand, developed another method of producing metallic magnesium. He published in Mémoire sur le Radical métallique de la Magnésie (1831) the process of obtaining magnesium which involves heating magnesium chloride (MgCl2) and potassium (K) in the retort [1, 3, 4].
After dissolving potassium chloride (KCl) formed as a result of the reaction, pure magnesium remained in the retort. In the mid-nineteenth century, this method allowed magnesium production in Paris and Manchester which was initially almost entirely devoted to photography. Metallic magnesium was obtained in the form of a wire or powder. In 1852, Robert Bunsen using the Davy’s concept constructed a bath for the electrolysis of molten magnesium chloride. Several years later, in 1886, the production of magnesium began in Germany using the modification of the Bunsen’s bathtub. This process was jointly undertaken by Chemische Fabrik Griesheim-Elektron and Aluminium and Magnesium Fabrik on an industrial scale in 1896. What is more, between 1914 and 1915, it was the only major magnesium producer in the world [2].
Due to low mechanical properties, the element itself is not used as a construction material. Magnesium alloys, however, are completely different. They present much better mechanical and strength properties taking special care to maintaining their most important low-density advantage through various modifying treatments. The interest in these rates dates back to the beginning of the twentieth century. Classical magnesium alloys are a combination of aluminium, magnesium, manganese and zinc. Magnesium combined with lithium forms ultralight alloys that have many uses. Since it is a reasonable material, it offers great possibilities and is constantly tested at various angles of applications and properties [2, 3, 4].
A few decades ago, magnesium alloys were used mainly for military purposes. Today due to the development in plastic deformation, heat treatment and manufacturing (e.g. cooling by high cooling rate, thixocasting), they are used in other fields, such as the automotive or aerospace industries.
In addition to low density, they exhibit many other benefits, such as good corrosion and castability, high dimensional stability and resistance to shocks and impacts, low shrinkage, the ability to be applied to 300°C elements as well as the ease of welding and recycling [4, 5, 6, 7].
Magnesium, previously used for military purposes, seems to fit perfectly to the requirements of the currently prevailing technology. Low density, with appropriate mechanical properties (strength, high operating temperature), good foundry properties (high castability and low shrinkage), vibration damping ability, and cost-effectiveness of recycling, seem to be an ideal response to market needs [1, 2, 3, 7].
All things considered, magnesium alloys are the perfect material used in various industries starting from the automotive industry, through sport, electronics up to the space industry and defence.
That work was developed by experts in various areas of magnesium science and technology. It gives a general idea of modern advancements in theory and practical purposes of magnesium alloys. The book reports fundamental aspects of corrosion types, details about magnesium alloys designed to work in elevated temperature and superplastic behaviour. Fundamentals, broad experience, theory as well as complex technological aspects make this work helpful for engineers and scientists from all over the world.
Bariatric surgery is the most effective option for individuals with severe obesity. It includes several surgical procedures, commonly divided into restrictive such as Laparoscopic Adjustable Gastric Banding, Banded Gastric Bypass, Sleeve Gastrectomy, malabsorptive such as Biliopancreatic Diversion, Intragastric Balloon, and mixed procedures such as Roux-en-Y- Gastric Bypass, Mini Gastric Bypass, and Gastric Bypass.
Bariatric surgery procedures lead to substantial weight loss and marked improvements in obesity-related comorbidities as well as quality of life. Nonetheless, there is a significant variation in long-term weight loss maintenance and weight regain has been partially attributed to psychological factors.
For these reasons, the pre-operative evaluation of the psychological conditions of the candidates for bariatric interventions is required in order to achieve the desired post-operative outcomes for a long time. In addition, adjunctive pre or post-operative psychosocial interventions are highly recommended for bariatric patients [1, 2] with psychological difficulties.
Within this chapter, the main components of pre-surgical psychological assessment for bariatric candidates will be discussed, including procedures and instruments involved. Moreover, an overview of the principal characteristics of pre/post-surgical psychological support will be provided.
Bariatric surgery has become a popular treatment option for the management of obesity. However, not every obese individual could be considered as a candidate for bariatric surgery. The National Institutes of Health (NIH) Consensus Development Conference Panel held in 1951 outlined criteria for patients considering for bariatric surgery:
BMI > 40 (obesity grade III); BMI > 35 (obesity grade II) with comorbidities; BMI > 30 (obesity grade I with uncontrolled Diabetes Mellitus type 2 and high cardiovascular risk)
Reported previous failure of nonsurgical weight-loss efforts
Absence of medical or psychological contraindications
Being well-informed, motivated, and compliant
A pre-surgical evaluation of the candidates to bariatric surgery should be conducted in order to assess the presence of recommended criteria for surgery, and to identify and modify, when possible, any risk factors associated with undesired treatment outcomes that may reduce the long term-successful weight loss.
Within the pre-surgical evaluation, the psychological assessment of candidates for bariatric surgery is an essential component. The rationale for the evaluation for bariatric surgery candidates was based on collecting evidences suggesting the presence of a higher level of psychiatric disorders among obese patients than the normative population [3]. The principal goals of psychological pre-surgical evaluation are:
to identify any psychosocial contraindications to surgery and obstacles to post-operative success, or any psychosocial factor predicting previous weight gain prior to surgery;
to screen candidates who may benefit from a psychological treatment prior to surgery, in order to maximize long term bariatric outcomes and improve their quality of life;
to select patients who may need further psychological support after surgery;
to propose alternative treatment when patients do not meet the criteria for bariatric surgery [4].
According to a recent systematic review [5] about one-third of bariatric surgery candidates present a psychological disturbance, such as depression and anxiety and there is a high prevalence of Binge Eating Disorder [6]. Other mental health conditions related to bariatric candidates are psychosis, PTSD substance abuse and personality disorders.
Although the prevalence of mental health conditions among bariatric patients is higher than in the normative population, there is no clear evidence that pre-operative mental health conditions are associated with poorer post-operative weight loss [7]. Nevertheless, prospective studies showed that pre-operative depression and anxiety predict poorer outcomes after surgery [6].
Unfortunately, long term successful weight loss could be less than optimal, and partially depends on the individual’s ability to implement consistent lifestyle changes. For these reasons the psychological evaluation of bariatric surgery candidates is requested for monitoring and addressing psychological factors pre-and-post surgery.
In a recent review [8] aimed to explore the present practices adopted by clinics to assess bariatric candidates, it has been highlighted that, in many cases, the presence of uncontrolled symptoms of schizophrenia, drug and alcohol abuse, mental retardation and lack of knowledge about surgery are considered contraindications to surgical approval. Other factors that most frequently are considered limitations to surgery include the presence of symptoms of bipolar disorder and history of suicide attempts, lack of compliance to medical recommendations, unrealistic expectation to surgery outcome, while the age of patients as well as the lack of social support are often considered no-contraindication to surgery. Possible contraindications that could represent a limitation to surgery are past criminal behaviors, the presence of eating disorders, and the inability to follow a diet over time. Finally, according to the programs included in the study, binge eating disorder, depression, obsessive–compulsive disorder, tobacco use, and history of sexual abuse are considered definite or possible contraindication to surgery.
Although the relevance of the psychological assessment for bariatric surgery candidates was recognized for a long time, currently no evidence-based guidelines are available [9, 10].
According to the most commonly used practices in surgery clinics, the evaluation of candidates for bariatric surgery comprises a medical chart review, a comprehensive clinical interview, and psychological testing [11]. Moreover, the psychological assessment should be part of a multidisciplinary approach aimed to carefully assess risks and benefits for the patients related to surgery.
Clinical interviews are commonly used in bariatric centers. During the interview, several areas of interests should be properly investigated:
Patient’s understanding of the surgery
Patients seeking bariatric surgery are required to have adequate knowledge about the surgery procedures, including which are the potential risks associated with surgery, as well as the lifelong behavioral change that must occur for achieving expected results. For these reasons, during the presurgical psychological evaluation, it is important to know which are the patient’s expectation to surgery and assess their willingness to engage themselves in a stable lifestyle behavioral change.
Eating behaviors
Among the obese population, there is a high prevalence of individuals with comorbid Binge Eating Disorder (BED), mainly characterized by frequent episodes of binge eating in the absence of following compensatory strategies such as vomiting or purging. Other common eating disorders are Bulimia Nervosa (BN) and Night Eating Syndrome (NES). BM refers to recurrent binge episodes associated with compensatory extreme weight-control behaviors such as vomiting, purging, strict dieting, excessive physical activity. NES consists of morning anorexia, evening hyperphagia, and insomnia. Patients with an eating disorder need to understand that surgery alone cannot modify their problematic eating behaviors, but further efforts in changing their lifestyle behaviors related to eating and physical activity are required in order to achieve lifelong weight loss.
Psychiatric conditions
Any previous or current psychiatric disturbance should be addressed during the pre-surgical assessment. The evaluation for psychiatric disorders is aimed to identify symptoms of depression, anxiety, mania, psychosis, suicidal ideation, substance abuse, history of abuse or familial history of mental health problems and previous treatment experienced. Diverse opinions exist about the influence of psychiatric disturbances on surgery outcomes. According to some authors, the presence of one or more mentioned psychiatric disturbances alone is not a contraindication for bariatric surgery. However, it is important to evaluate the severity of symptomatology and, if necessary, referring patients for additional psychological support previous to surgery. Other authors suggest that the presence of uncontrolled eating, current substance abuse, poor adherence to recommendation, psychosis, severe mood disorders, major life stressors should be considered as contraindications to bariatric surgery [12, 13].
Social support
Given the impact that surgery will have not only on their lives but also on the environment where patients live, during the psychological assessment clinicians should explore the familial and the social context that surrounds patients. Candidates should be asked to describe the people who live with them, their opinion relative to bariatric surgery decision and whether their family will help them after surgery. Patients should be informed about the possible social consequences that may occur after surgery.
There is an availability of templates for conducting interviews that help clinicians to assess the domains of interest.
The Weight and Lifestyle Inventory [14] is designed to assess the eating and physical activity habits, the psychological status and the presence of stressful life events.
The Boston Interview [15] aims to assess weight, diet, and nutrition history, dysfunctional eating, medical condition, understanding of surgical procedures, concerns and benefits, motivation for surgery, interpersonal functioning, and psychiatric conditions.
While clinical interviews are widely used in clinical settings, only a few clinics employ some forms of objective tests. The use of psychological instruments allows clinicians to collect more information, in a rapid but precise validated and empirical way than clinical interviews alone. Some broadband instruments provide a broad assessment of patients, across several psychological domains, including emotional, cognitive and behavioral ones. Unfortunately, broadband instruments cannot provide information about specific content areas, such as eating disorders, and require costs for administration. To overcome these limitations, clinicians can administer narrowband instruments that provide a good solution to assess specific domains. In addition, narrowband instruments are more feasible and can be administered quickly. Below is the description of the most frequently used broadband and narrowband instruments for the psychological evaluation of bariatric candidates.
Minnesota Multiphasic Personality Inventory (MMPI-2; [16]) is the most widely used instruments for the assessment of surgery candidates. It consists of 587 items and it can be administered in two hours approximately, while the newer version, MMPI-2 Restructured Form (MMPI-2 RF; [17]) is composed of 338 items and the time for administration is 35–50 minutes. MMPI-2 RF allows clinicians to assess the global functioning of patients, including thoughts emotions and behaviors. The test allows also to detect cognitive, interpersonal, and somatic problems.
Symptom Item Checklist–90 –Revised (SCL–90 –R; [18]). The SCL-90 –R is widely used to assess the global psychological distress by exploring nine dimensions: somatization, depression, anxiety, phobic anxiety, obsessive–compulsive, interpersonal sensitivity, hostility, psychoticism, and paranoid ideation. The higher scores reflect higher distress. It is composed of Likert scale-90 items in which symptoms are presented and patients are asked to report how many times they experienced each symptom in the past 7 days.
Beck Depression Inventory-II (BDI-II; [19]) is a self-report measure composed of 21 items assessing the presence of depressive symptoms.
Beck Anxiety Inventory (BAI; [20]). is a self-report measure composed of 21 items assessing the presence of anxiety symptoms.
Binge Eating Scale (BES; [21]). It is one of the most common instruments used among the bariatric population. It is composed of 16 self-report items assessing binge eating severity.
The Eating Disorders Inventory–III (EDI-III; [22]); It consists of 91 items related to 11 subscales: bulimia, thinness, body dissatisfaction, ineffectiveness, perfectionism, interpersonal distrust, interoceptive awareness, maturity fears, asceticism, impulse regulation, and social insecurity.
Below, a table to describe the most widely used tests is presented in Table 1.
Number of item | Time for administration | Subscales/Key areas | |
---|---|---|---|
Personality assessment | |||
MMPI 2 | 567 | 90–120 min | Response attitudes, mental health symptoms, personality traits, and special problems 10 clinical scales and 6 validity scales. Domains: personality traits, mental health symptoms, special problems, response attitudes |
MMPI-2-RF | 338 | 35–50 min | 42 substantive scales and 9 validity scales. Domains: problems, interests, personality psychopathology |
SCL-90-R | 90 | 12–15 min | Global psychological distress. 9 Scales: somatization, obsessive–compulsive, interpersonal sensitivity, depression, anxiety, anger/hostility, phobic anxiety, paranoid ideation, psychoticism |
PAI | 344 | 50–60 min | 11 clinical scales assessing psychopathology in three spectrums: neurotic, psychotic, and behavioral/impulse control; 5 Treatment scales assessing risk for self-harm or harm to others, how patients respond to environmental factors, and motivation for treatment; 2 interpersonal scales assessing warm/affiliative versus cold/rejecting and dominating/controlling versus submissive; 4 validity scales |
MBMD | 165 | 20–25 min | 32 clinical scales and 5 validity scales. Domains: response patterns, negative health habits, psychiatric indications, coping styles, and stress moderators |
MCMI-III | 175 | 25–30 min | 14 personality disorders; 10 clinical syndromes; 5 validity scales |
BPI | 240 | 35 min | 12 clinical scales: Hypochondriasis, Depression, Denial, Interpersonal Problems, Alienation, Persecutory Ideas, Anxiety, Thinking Disorder, Impulse Expression, Social Introversion, Self-Depreciation, and Deviation; 2 validity scales |
Eating disorders | |||
EDI-3 | 91 | 20 min | 11 subscales: drive for thinness, bulimia, body dissatisfaction, ineffectiveness, perfectionism, interpersonal distrust, interoceptive awareness, maturity fears, asceticism, impulse regulation, and social insecurity |
EDE-Q | 32 | 5–10 min | Eating behaviors. Subscales: restraint, eating concern, weight concern, and shape concern |
QEWP | 28 | 5 min | Binge eating patterns |
TFEQ | 51 | 20 min | Cognitive and behavioral components of eating. 3 scales: restraint, hunger, and disinhibition |
BES | 16 | 5 min | Symptoms of Binge Eating |
NEQ | 14 | 5–10 min | Symptoms of night eating syndrome. 4 scales: nocturnal ingestion, evening hyperphagia, morning anorexic, and mood/sleep |
Mood Disturbances | |||
BDI-II | 21 | 5–10 min | Symptomps of depression |
BAI | 21 | 5–10 min | Symptoms of anxiety |
PHQ-9 | 9 | 5 min | Symptoms of depression |
CES-D | 20 | 10 min | Symptoms of depression |
MDQ | 13 | 5 min | Bipolar symptoms |
GAD-7 | 7 | 5 min | Symptoms of anxiety |
Substance abuse | |||
AUDIT | 10 | 5 min | Drinking patterns |
MAST | 25 | 5–10 min | Alchool abuse and related problems |
SASSI-3 | 93 | 20 min | Substance abuse. 8 subscales: symptoms of substance misuse, obvious attributes, subtle attributes, defensiveness, supplemental addiction measure, family versus control subjects, correctional, and random answering pattern |
Quality of life | |||
IWQL | 74 | 15 min | 8 domains: health, social/interpersonal life, work, mobility, self-esteem, sexual life, activities of daily living, comfort with food |
Cognitive development | |||
MMSE | 30 | 10 min | Cognitive impairment. Domains: orientation, attention, registration, recall, language, repetition, complex commands. |
Physical conditions | |||
MBHI | 150 | 20 min | Personality and Coping style among people with physical pathologies. 8 coping style scales; six psychogenic attitudes; 3 psychosomatic correlate scales; 3 risk for poorer outcomes scales. |
Principal used psychometric instruments for the assessment of bariatric candidates.
Abbreviations: MMPI-2; Minnesota Multiphasic Personality Inventory 2; MMPI-2-RF: Minnestota Multiphasic Personality Inventory-2-Revised Form; SCL-90-R: Symptom Check-List-90-Revised; PAI: Personality Assessment Inventory; MBMD: Millon Behavioral Medicine Diagnostic; MCMI-III: Millon Clinical Multiaxial Inventory; BPI: Basic Personality Inventory; EDI-3: Eating Disorders Inventory; EDE-Q: Eating Disorder Examination-Questionnaire; QEWP: Questionnaire of Eating and Weight Patterns–Revised; TFEQ: The Three-Factor Eating Questionnaire; BES: Binge Eating Scale; NEQ: Night eating Questionnaire; BDI-III: Beck Depression inventory; BAI: Beck Anxiety Inventory; PHQ-9: The Patient Health Questionnaire-9; CES-D: Center for Epidemiologic Studies Depression Scale; MDQ: Mood Disorders Questionnaire; GAD-7: Generalized Anxiety Disorder-7; AUDIT: Alcohol Use Disorders Identification Test; MAST: Michigan Alcoholism Screening Test; SASSI-3: Substance Abuse Subtle Screening Inventory-3; IWQOL: Impact of Weight on Quality of Life; MMSE: Mini-Mental State Evaluation; MBHI: Millon Behavioral Health Inventory.
Bariatric surgery is the most effective intervention for weight loss in the field of obesity management. Unfortunately, patients often do not achieve optimal results in term of weight loss maintenance over time and meet various difficulties related to eating behaviors and psychological functioning. Given the significant variation in weight long-term outcomes after surgery that could be partially attributed to a number of risk factors, including psychological factors, psychological pre-operative or post-operative interventions are increasingly being recommended for patients seeking or undergoing bariatric surgery [23].
The most delivered psychological interventions included Cognitive Behavioral Therapy (CBT) but promising evidence suggests the effectiveness of intervention based on Acceptance and Commitment Therapy (ACT) and Dialectical Behavioral Therapy (DBT).
Cognitive behavioral interventions typically include psychoeducation, goal setting, self-monitoring, stimulus control, problem solving, and reinforcement, for the promotion of lifestyle-related behavior change. Through the psychological intervention, patients are encouraged to recognize their problematic eating behaviors, learn strategies to cope with life stressors, and engage themselves in healthy eating behaviors and physical activity. Recently, David and colleagues [5] conducted a systematic review aimed to examine the effectiveness of cognitive behavioral interventions. Results showed that the most common techniques employed during the interventions were psychoeducation, self-monitoring, goal setting, stimulus control, cognitive restructuring, problem solving and reinforcement, as well as addressing ambivalence, improving self-care and prevention of relapse. Most of the interventions included in the study were delivered in person, or in combination with telephone or web. With respect to intervention outcomes, the main findings of the review revealed that 32% of included studies showed a significant impact on weight loss. Specifically, it seems that the higher impact on weight loss was found in post-operative intervention, than the benefits of pre-operative interventions which were not maintained at follow-up. Other interventions outcomes were lifestyle behaviors, eating pathology, and psychological functioning. Results showed that psychological interventions seem to have an inconsistent influence on change in dietary habits and physical activity, but a limited number of studies examined this outcome. With respect to eating pathology, psychological interventions included in the study revealed a significant impact on reducing binge eating and emotional eating. Similarly, interventions had a positive impact on psychological functioning. Both pre-operative and post-operative interventions improved quality of life and reduced depression and anxiety symptoms.
Recently, other forms of psychological interventions were applied to bariatric patients. In a pilot RCT, Weineland and colleagues [24] compared an intervention based on ACT (two face to face session in combination with internet-based support) to usual treatment. Results showed that patients in the ACT condition significantly improved in eating disorders, body dissatisfaction, quality of life, and acceptance of thoughts and feelings related to weight.
Promising results were also obtained in an observational study [25] in which a pre-operative intervention based on DBT skills training combined with treatment as usual compared to a treatment as usual group. The intervention of DBT was focused on regulating emotions with emotion regulation, mindfulness, distress tolerance, and interpersonal effectiveness training. The results offered preliminary evidence in support of the effectiveness of a brief DBT skills training intervention in combination with treatment as usual in reducing eating pathology (binge eating and emotional eating).
Bariatric surgery has been demonstrated to be a valid solution for the treatment of obesity. It is recommended for well-motivated and informed patients with severe obesity or obesity with related comorbidities. Approximately, all bariatric surgery procedures are effective in producing weight loss and related substantial improvements in health conditions [26, 27, 28].
Candidates for bariatric surgery require not only a multidisciplinary pre-operative screening, which is aimed to prepare and educate patients for the lifestyle changes required after surgery, but also would benefit from a supportive, integrated additional psychological interventions aimed to maximize weight loss and weight loss maintenance after surgery. Particularly, weight loss is not the primary goal of psychological interventions. In fact, findings indicate that the pre-operative interventions do not have a significant effect on weight loss [29]. Rather, they should be considered an option for patients to overcome their difficulties, reduce pre-existing symptomatology, and improving in their eating behaviors and lifestyle. On the contrary, psychological post-operative interventions have been associated with significant weight loss and currently they are the most promising approach to improve the outcomes of bariatric surgery.
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