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Файл:Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_1116_Библиотеки_им_академика_М_И_Перельмана.pdf
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- •Foreword
- •Preface
- •Acknowledgments by Salman Al-Sabah
- •Contents
- •Editors and Contributors
- •Introduction
- •Learning About the Laparoscopic Sleeve Gastrectomy (lSG) The Birth and Evolution of Laparoscopic Sleeve Gastrectomy
- •1 Introduction
- •2 Costing Methods
- •3 Costing Components
- •4 Cost of Obesity and Overweight: The Evidence
- •5 Overall Cost of Obesity
- •6.1 Ischaemic Heart Disease and Stroke
- •References
- •Obesity, a Costly Epidemic
- •6.2 Diabetes Mellitus
- •6.3 Osteoarthritis
- •6.4 Cancers
- •7 Conclusion
- •References
- •The Health Effects of Obesity
- •1 Obesity Reduces Life Expectancy
- •2 Obesity and Cardiovascular Disease
- •3 Obesity and Respiratory Disease
- •4 Obesity and Cancer
- •5 Other Obesity-Related Conditions
- •6 Health Effects of Obesity in Special Populations
- •6.1 Transplant Recipients
- •6.2 Orthopedic Surgery Patients
- •6.3 Pregnancy
- •6.4 Children and Adolescents
- •7 Conclusion
- •References
- •Obesity and Body Mass Index
- •2 Obesity and BMI
- •3 Percent Excess Weight Loss (%EWL)
- •4 Percent Excess BMI loss (%EBMIL)
- •5 Percent of Total Weight Loss (%TWL)
- •References
- •Dealing with Obesity: Patient Perspective
- •1 Considering the Psychology of Obesity
- •2 Education for Success
- •3 Understanding the Necessity of Mind Shift for Success
- •The Future of Bariatric Surgery and Genetics
- •1 Heritability and Obesity
- •2 Weight Loss Interventions and Genetics
- •3 Bariatric Surgery and Genetics
- •References
- •Sleeve Gastrectomy Registries
- •1 Introduction
- •3 The Value of Registries
- •7.1 Direct-Data Entry Only
- •7.2 Electronic Upload Only
- •8 Key Step 5—Create a Suitable Minimum Dataset
- •9 Key Step 6—Layer in GDPR Compliance
- •14 Conclusion
- •References
- •Weight Loss: Diet Options
- •1 Introduction
- •2 Principles in Dietary Therapies
- •3 Diet Options for Weight Loss
- •4 The Weight-Maintenance Diet
- •5 Summary
- •References
- •Candidates for Sleeve Gastrectomy
- •Eligibility Criteria for Sleeve Gastrectomy
- •1 Introduction
- •2 Current Eligibility Criteria for Bariatric Surgery
- •3 Age
- •4 BMI
- •5 Procedure Selection
- •6 Other Considerations in Decision-Making
- •7 Summary
- •References
- •The Sleeve and Pregnancy
- •1 Pre-pregnancy Weight Management
- •2 Pre-pregnancy Supplementation
- •3 Acceptable Weight Changes in Pregnancy
- •4 Care During Pregnancy
- •5 Gestational Diabetes
- •5.1 Screening
- •5.2 Treatment
- •5.3 Mode of Delivery
- •5.4 Postpartum
- •References
- •The Sleeve and Reproductive Potential
- •1 Introduction
- •2 Obesity and Female Reproduction
- •3 Obesity and Male Reproduction
- •4 Female Reproduction Following Bariatric Surgery
- •5 Male Reproduction Following Bariatric Surgery
- •6 Timing of Conception Following Bariatric Surgery
- •8 Conclusion
- •References
- •6 RYGB to SG
- •7 SG After Endoscopic Procedures
- •8 Conclusion
- •References
- •Converting Endoscopic Bariatric Procedures to LSG: POSE, Endosleeve, and Balloon
- •1 Introduction
- •The Sleeve as a Revisional Procedure
- •1 Introduction
- •2 General Considerations
- •3 Choice of Technique Based on Evidence
- •5 Sleeve Gastrectomy to Re-sleeve
- •2 The POSE Procedure
- •2.1 How the POSE is Performed
- •2.2 Converting a POSE to an LSG
- •3 The Endosleeve
- •3.1 How the Endosleeve is Performed
- •3.2 Converting Endosleeve to LSG
- •4 The Balloon
- •4.1 LSG Following Balloon Removal
- •5 Conclusion
- •References
- •The Sleeve Gastrectomy in Adolescents
- •1 Introduction
- •2 Eligibility
- •2.1 Who is Eligible?
- •3 Which Procedure is Right for Adolescents
- •4 Pre- and Post-operative Nutritional Care
- •5 Psychological Concern
- •6 The Outcomes of SG
- •References
- •2 Epidemiology
- •3 Risk Factors
- •4 Pathophysiology
- •5 Clinical Presentation
- •6 Diagnosis
- •7 Non-invasive Tests
- •7.1 Laboratory Investigations
- •7.2 Imaging
- •8 Scoring Systems
- •8.1 Invasive Measure
- •8.1.1 Liver Biopsy
- •9 Clinical Scores
- •10 Sleeve Gastrectomy in NAFLD and NASH
- •13 Sleeve Gastrectomy Pre-transplant
- •15 Sleeve Gastrectomy After Liver Transplantation
- •References
- •Sleeve Gastrectomy in Immunocompromised Patients
- •1 Introduction
- •2 Safety and Postoperative Morbidity
- •2.2 Perioperative Timing of Immunosuppressive Therapy
- •3 Outcomes of SG in Immunocomromised Patients
- •3.2 Changes to Rheumatoid and Autoimmune Conditions
- •4 Summary
- •References
- •Sleeve Gastrectomy and Cancer
- •1 Obesity and Cancer
- •2 Pathogenesis of Cancer in the Obese
- •3 Current Literature
- •4 Bariatric Surgery and Cancer Risk
- •5 Colorectal Cancer (CRC)
- •6 CRC in RYGB Versus SG and AGB
- •7 Breast and Endometrial Cancers
- •8 SG and Gastro-esophageal Cancer
- •9 Conclusion
- •References
- •Multidisciplinary Care Before and After Sleeve Gastrectomy
- •1 Introduction
- •2 Bariatric/Obesity Specialist
- •3 Bariatric Dietitian
- •4 Bariatric Clinical Psychologist
- •5 Bariatric Coordinator
- •6 Conclusion
- •References
- •Psychiatric Evaluation: Pre and Post Sleeve
- •1 Introduction
- •3 Depression
- •4 Eating Disorders
- •5 Anxiety
- •6 Substance Use Disorders
- •7 Self-harm and Suicidal Ideation
- •8 Psychotropic Medications
- •10 Mental Health Preoperative Assessment
- •11 Outline of Domains of the Evaluation
- •12 Psychiatric Contraindications for Bariatric Surgery
- •13 Conducting the Assessment
- •13.1 History of Weight Loss and Previous Attempts
- •13.2 Medical History
- •13.3 Pathological Eating Behavior
- •13.4 Psychiatric History and Screening of Substance Use
- •13.5 Support System
- •13.6 Psychiatric Medication
- •14 Psychiatric Assessment Conclusion
- •15 Special Populations
- •15.1 The Adolescent Patient
- •15.2 Limited Cognitive Function
- •16 The Impact of Bariatric Surgery on Mental Health
- •16.1 Quality of Life
- •16.2 Mental health status
- •16.3 Suicide
- •16.4 Addiction
- •16.5 Eating Disorders
- •16.6 Psychotropic Medication
- •16.7 Postoperative Pharmacological Considerations
- •17 Conclusion
- •References
- •Insurance, Self-Pay and Medical Tourism
- •How Much Does the Sleeve Cost
- •1.1 Economic Methodologies
- •1.2 Fixed Costs: Medical Devices
- •1.3 Fixed Costs: Personnel
- •1.4 Variable Costs: Reusable Instruments
- •1.5 Variable Costs: Disposables
- •2 Bariatric Surgery Costs
- •2.1 Methods for Identifying Cost Components
- •2.2 Methods for Valuing Cost Components
- •3 The Cost of the Sleeve Around the World
- •References
- •Analysis of LSG Competitors
- •1 Competition in the Industry
- •2 Potential of New Entrants into the Industry
- •3 Threat of Substitute Products
- •3.1 Anti-obesity Medications
- •3.2 Herbal and Alternative Medicine
- •3.3 Diet Program
- •3.4 Exercise
- •3.5 Acupuncture and Acupressure for Weight Loss
- •4 Power of Customers
- •5 Power of Suppliers
- •5.1 Strengths
- •5.2 Weaknesses
- •5.3 Weaknesses of Duodenal Switch Surgery
- •5.4 Opportunities
- •5.5 Threats
- •References
- •Medical Tourism: Global Bariatric Healthcare
- •1 Introduction
- •2 The Impetus Behind Global Healthcare
- •4 Conclusion
- •References
- •Sleeve Gastrectomy: Medicolegal Aspects
- •References
- •Laparoscopic Sleeve Gastrectomy 101
- •References
- •Robotic Sleeve Gastrectomy
- •1 Introduction
- •2 Robotic-Assisted Sleeve Gastrectomy
- •3 Cost of Robotic-Assisted Sleeve Gastrectomy
- •5 Operative Technique
- •6 Clinical Outcomes
- •7 Future Directions
- •8 Conclusion
- •References
- •Laparoscopic Sleeve Gastrectomy in Situs Inversus Totalis
- •1 Introduction
- •2 How to Perform the Procedure
- •3 Discussion
- •4 Conclusion
- •References
- •Banded Sleeves
- •1 Introduction
- •2 Procedure
- •3 Pre- Intra- and Post-Operative Management
- •4 Results
- •5 Band Complications
- •7 Conclusions
- •References
- •Buttressing the Sleeve
- •1 Introduction
- •2 Technical Aspects
- •3 Buttressing for Bleeding
- •4 Buttressing for Leaks
- •5 Results from the MBSAQIP
- •6 Previous Evidence
- •7 Conclusion
- •References
- •Sleeve and Ventral Hernias
- •1 Introduction
- •2 Prevalence, Incidence and Cost of Ventral Hernia
- •4 Primary Abdominal Wall Hernia
- •5 Incisional Hernia
- •5.1 Medial or Midline Zone
- •5.2 Lateral Hernias (Flank Hernias)
- •6 Size of the Hernia
- •7 Indication and Risks of Ventral Hernia Repair
- •8.1 Position of Trocar and Creation of Pneumoperitoneum
- •9 Principles of Adhesiolysis
- •10 Measurement of Hernia Defect
- •12 Technique of Open Ventral Hernia Repair [10, 25, 26]
- •13 Concurrent LSG with LVHR
- •14 LSG with Sequential LVHR
- •15 Conclusion
- •References
- •1 Introduction
- •5 Operative Concerns and Patient Selection
- •6 Preoperative Evaluation
- •7 Esophageal High-resolution Manometry
- •8 Surgical Technique
- •9 Discussion
- •References
- •Omentopexy in Laparoscopic Sleeve Gastrectomy
- •1 Background
- •3 Omentopexy in Sleeve Gastrectomy
- •3.2 Operative Technique
- •5 Effect on Gastric Emptying
- •6 Conclusion
- •References
- •Sleeve Gastrectomy and Gallstones Disease
- •1 Introduction
- •2 Obesity and the Risk of Gallstone
- •3 Rapid Weight Loss and the Risk of Gallstone
- •5 Incidence of Cholecystectomy in Sleeve Gastrectomy
- •6 Biliary Complications Post LSG
- •7 Cholecystectomy: When to Operate?
- •8 Prophylactic (Routine) Cholecystectomy
- •9 Elective (Selective) Cholecystectomy:
- •11 Ursodeoxycholic Acid (UDCA) Prophylaxis
- •12.1 Dose, Frequency
- •13 Disadvantages of UDCA
- •14 Summary
- •15 Conclusion
- •References
- •LSG Under Block Anesthesia (PVB)
- •1 Introduction
- •2 Review on General Anesthesia
- •2.1 General Overview
- •2.2 General Anesthesia in the Obese/bariatric Population
- •3 Review on Paravertebral Block (PVB)
- •4 Anatomy
- •4.1 Indication
- •4.2 Techniques
- •4.2.1 Blind Technique
- •4.2.2 Neurostimulation Technique
- •4.2.3 Ultrasound Guided Technique
- •4.3 Mechanism and Spread of Anesthetic
- •4.4 Anesthetic Drugs
- •4.5 Complications
- •4.6.1 Abdominal Surgeries
- •4.6.2 First Paravertebral Block in Sleeve Gastrectomy
- •References
- •Elderly High Risk Patients Undergoing Laparoscopic Sleeve Gastrectomy
- •1 Scope of the Problem
- •1.1 Increasing of the Elderly Population
- •1.3 Risks of Surgery in the Elderly
- •1.3.1 Bariatric Surgery in Elderly
- •2 Sleeve Gastrectomy: Procedure of Choice
- •2.1 Intraoperative Difference in Elderly
- •3 Postoperative Care in the Elderly
- •4 Postoperative Mortality and Morbidity
- •5 Postoperative Outcomes
- •5.1 Excess Body Weight Loss
- •5.2 Comorbidities Improvement
- •5.3 Quality of Life Improvement
- •6 LSG in Septuagenarians and Elderly Super Obese
- •7 LSG Compared to Gastric Bypass in Elderly
- •8 Conclusions
- •References
- •Postoperative Diet Progression for Laparoscopic Sleeve Gastrectomy
- •1 Introduction
- •2 Diet Progression: Stages
- •3 Conclusion
- •References
- •How Laparoscopic Sleeve Gastrectomy May Cause Weight Loss
- •1 Ghrelin Effect
- •1.1 Other Gastrointestinal Hormone Secretion
- •1.2 Other Molecular Changes
- •1.3 Bile Acid Metabolism
- •1.4 Microbiome
- •1.5 Central Nervous System Changes
- •1.6 Conclusion
- •References
- •Expected Weight Loss After the Sleeve
- •1 Introduction
- •2 Preoperative Weight Loss
- •3 Short-Term and Mid-Term Outcomes
- •4 Long-Term Outcomes
- •6 Summary
- •References
- •1 Introduction
- •2 Set Point Theory
- •3 Weight Regulation and Weight Loss Maintenance
- •6 Neurohormonal Regulation of the Body Set Point
- •8 Conclusions
- •References
- •Quality of Life and Bariatric Surgery
- •1 Medical Outcomes Survey Short Form 36S (SF-36)
- •3 The Bariatric Quality of Life Index (BQL)
- •References
- •LSG: Risks and Considerations
- •Risks Associated with Sleeve Gastrectomy
- •References
- •Outcomes and Complications After Sleeve Gastrectomy
- •1 Introduction
- •2 Impact on Obesity
- •3 Impact on Diabetes
- •4 Impact on Hypertension
- •5 Impact on Dyslipidaemia
- •6 Complications
- •7 Non-Surgical Complications of Sleeve Gastrectomy
- •9 Early Complications of Sleeve Gastrectomy
- •10 Alteration to Bile Flow After Sleeve Gastrectomy
- •11 Anatomical Changes After Sleeve Gastrectomy
- •12 Vagus Nerve Modulation After Sleeve Gastrectomy
- •13 Cardiovascular Effects of Sleeve Gastrectomy
- •14 Effects on Microbiota After Sleeve Gastrectomy
- •15 Impact on Metabolism After Bariatric Surgery
- •16 Conclusion
- •References
- •How to Manage Sleeve Complications: Hemorrhage
- •1 Background
- •2 Bleeding Cascade, Patient and Surgeon Factor
- •3 Surgical Stapler Technology
- •4 Management and Prevention
- •4.1 Buttressing, Oversewing
- •5 Hemostats
- •6 Summary
- •References
- •Endoscopic Management of Leak and Abscess Following Laparoscopic Sleeve Gastrectomy
- •1 Introduction
- •3 Closure of the Leak Site
- •3.1 Self-Expanding Metal Stents
- •3.2 Types of SEMS
- •3.3 SEMS Insertion Procedure
- •3.4 Outcome of SEMS Placement
- •3.5 Over-The Scope Clip System
- •4 Internal Drainage
- •4.1 Endoscopic Internal Drainage
- •4.2 EID Procedure
- •4.3 Outcome of EID Procedure
- •4.4 Endoscopic Vacuum Therapy
- •5 Septotomy and Pneumatic Balloon Dilatation
- •6 Conclusion
- •References
- •How to Manage Sleeve Complications: Surgical Leak and Abscess
- •1 Introduction
- •2 Principles of Management
- •3 Endoscopy
- •4 Surgery
- •4.1 Control of Early Complications and Nutritional Status
- •4.2 The Leak Site
- •4.3 Roux en Y Fistulo-Jejunostomy
- •4.4 Literature Review of the Remaining Surgical Options
- •4.5 Discussion of the Surgical Approach
- •5 Conclusion
- •References
- •How to Manage Sleeve Complications Through Endoscopy: Strictures
- •1 Introduction
- •4 Signs and Symptoms
- •5 Diagnosis and Management
- •6 Bougie Dilation
- •8 Self-Expanding Metal Stent (SEMS) Placement
- •10 Strategies for Endoscopic Success
- •11 Conclusions
- •References
- •Sleeve Gastrectomy Stenosis: Surgical Treatment
- •1 Introduction
- •2 Diagnosis
- •3 Incidence
- •4 Prevention
- •5 Treatment
- •6 Conclusion
- •References
- •1 Introduction
- •2 Mechanisms of GERD Post-Sleeve Gastrectomy
- •3 Incidence of GERD After Sleeve Gastrectomy
- •4 Screening Recommendations
- •5 Role of Pharmacotherapy, Diagnosis, and Testing
- •7 Radiofrequency Ablation
- •8 Transoral Incisionless Fundoplication (TIF)
- •9 Conclusion
- •References
- •1 Background
- •2 Pathophysiology

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Sleeve Gastrectomy in Immunocompromised Patients
Amin Andalib
1 Introduction
Over the course of the past decade and a half, sleeve gastrectomy (SG) has
become the most frequently performed primary bariatric surgery worldwide [1, 2].
During this time period, the popularity of SG has mainly been driven by the inferior results after adjustable gastric banding coupled with SG procedure being technically easier to perform compared to bypass-type procedures [3, 4] as well as its
safety profile and the satisfactory long-term outcomes [5–7]. Consequently, SG
has turned into the procedure of choice in patients with complex medical histories
including those suffering from advanced chronic kidney disease [8], renal transplant candidates [9] or patients suffering from inflammatory bowel disease (IBD)
[10] and other conditions requiring chronic immunosuppressant therapy [11].
2 Safety and Postoperative Morbidity
In the general population and irrespective of comorbid conditions, laparoscopic
SG is considered to be very safe with a thirty-day mortality and composite morbidity of 0.05% and 2.4%, respectively [12]. Two of the most troubling postoperative complications are postoperative staple-line leaks (0.6–1%) and hemorrhage
(0.7–1.4%) [12–14].
In the current era of bariatric surgery, with the improved operative safety profiles and the established role for minimally invasive techniques, patients who
A. Andalib (*)
Center for Bariatric Surgery, Department of Surgery, McGill University, Montreal, QC,
Canada
e-mail: amin.andalib@mcgill.ca
© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer
Nature Switzerland AG 2021
S. Al-Sabah et al. (eds.), Laparoscopic Sleeve Gastrectomy,
https://doi.org/10.1007/978-3-030-57373-7_16
139

A. Andalib140
undergo bariatric/metabolic procedures more frequently suffer from severe baseline chronic conditions including IBD, rheumatoid/autoimmune disorders, and
solid organ transplantation. These conditions are routinely treated with immunosuppressive agents and other novel disease-modifying anti-rheumatic drugs
(DMARDs). Consequently, the immunocompromised patients are considered a
high-risk population for perioperative adverse events by the nature of their chronic
use of immunosuppressants and other DMARDs that impact their wound healing
and prone them to infectious postoperative complications [15, 16].
2.1 Postoperative Morbidity After SG
in Immunocompromised Patients
For the immunocompromised patient population, SG is widely accepted as the
bariatric/metabolic procedure of choice [17] and this is primarily due to its acceptable safety profile and low incidence of major postoperative complications.
In a large multicenter study using 2005–2013 data from the American College
of Surgeons National Surgical Quality Improvement Program (ACS NSQIP),
Andalib et al. evaluated the 30-day postoperative outcomes of primary SG and
roux-en y gastric bypass (RYGB) in patients on chronic immunosuppressant
medications within at least 30 days prior to surgery [11]. While 30-day postoperative mortality and major morbidity were significantly higher among the patients
dependent of chronic immunosuppression compared to those who were not (0.5%
vs. 0.1% and 5.0% vs. 2.5%, respectively), the prevalence of such major complications were acceptable. Furthermore, both SG and RYGB procedures were found to
be equally safe in this patient population [11]. In another large study by Mazzei
et al. using 2015–2016 Metabolic and Bariatric Surgery Accreditation and Quality
Improvement Program (MBSAQIP) data, after a propensity-matched analysis,
chronic preoperative use of corticosteroids was not found to be an independent
predictor for worse outcomes except for a two-fold higher risk for leak (0.6% vs.
0.3%) along with slightly higher risk of readmission and reintervention after both
SG and RYGB compared to patients who did not take steroids [18]. Despite the elevated risk, the overall incidence of such postoperative adverse events remains low.
In addition, there is also data demonstrating the safety of continuing certain immunomodulators and biologic agents in the immediate perioperative period leading up
to surgery such as cardiac, orthopedic and colorectal procedures [18–20].
2.2 Perioperative Timing of Immunosuppressive Therapy
Given that the use of immunosuppressant/modulators is often critical for maintenance and management of patients’ chronic rheumatoid and autoimmune disorders, the consequences of withholding perioperative dosing should be carefully
considered by bariatric surgeons and in consultation with the respective treating
specialists. Moreover, due to the lack of high-quality studies on the perioperative

Sleeve Gastrectomy in Immunocompromised Patients
141
use and management of these agents in patients undergoing bariatric surgery, there
is great variability in clinical practice regarding holding or timing of perioperative
dosing of immunosuppressive agents [21].
In a recent systematic review, Kassel et al. attempted to evaluate the impact
and management of perioperative use of immunosuppressive agents in patients
undergoing bariatric surgery [21]. However, given the limited literature available
on the use of immunosuppressive therapies in patients undergoing bariatric surgery, data from non-bariatric procedures, specifically abdominal or other gastrointestinal operations were used to examine the risks associated with perioperative
use of immunosuppressive agents and DMARDs. Also due to the small and heterogeneous nature of the available studies, the data could not be pooled to provide a meta-analysis [21]. Although immunosuppressants discussed in this review
article were associated with an increased risk for infections, the limited data
available suggest corticosteroids, methotrexate, and tumor necrosis factor-alpha
(TNF-α) inhibitors may be safe to restart postoperatively provided there are no
signs of infections [21]. Furthermore, if medically possible prior to elective bariatric surgery, one should aim to hold immunosuppressants 2–12 weeks preoperatively and until 2–4 weeks after surgery [22, 23]. For biologic immunomodulators
and other DMARDs like TNF-α inhibitors, the timing of the surgery should ideally be planned according to the last dose since most agents are administered
every 2–8 weeks (Table 1) and if needed only one dose may be skipped after
surgery [24].
Therefore, management of each immunosuppressant agent must be handled individually and based on their respective routine interval dosing due to the
Table 1 Summary of preoperative dosing recommendations for selected TNF-α inhibitors.
(Adapted from Ref. [21])
Generic name
(Brand)
Adalimumab
(Humira)
Certolizumab
(Cimzia)
Etanercept (Enbrel) SC 1–2 weeks 3 days 2–3 weeks
Golimumab
(Simponi)
Infliximab
(Remicade)
TNF-α = Tumor necrosis factor-alpha; SC = Subcutaneous; IV = Intravenous
a
Dosing interval may vary based on the indication for the medication and the severity of the
disease
b
Administration of the last dose may vary depending on the dosing interval
Route of
administration
SC 1–2 weeks 14 days 2–3 weeks
SC 2–4 weeks 14 days 3–5 weeks
SC 4 weeks 14 days 5 weeks
IV 8 weeks – 9 weeks
SC 4–8 weeks 9 days 5–9 weeks
Dosing intervalaHalf-life
Recommended
administration of
last dose (before
surgery date)
b

A. Andalib142
varying disease-specific desired effects and the potential for undesired perioperative adverse events. Ideally, the decision and the timing to withhold the immunosuppressant medications should be weighed against the benefits of their use for
each case individually and in a multi-disciplinary fashion. Additional research is
needed to determine, with more granularity, the timing recommendations to hold
and restart these medications with respect to bariatric surgery.
3 Outcomes of SG in Immunocomromised Patients
3.1 Weight Loss and Improvements in Obesity-Related
Conditions
As previously mentioned, the literature on the use of bariatric surgery especially
SG in immunocompromised patients is scant. Therefore, the data on the beneficial
outcomes of SG in this patient population is also mainly driven from case series
[10, 25–27]. Furthermore, given the small sample size in reported studies, and an
even smaller sample size for those who underwent SG, reported weight loss and
comorbidity outcomes are pooled together and reported for all types of bariatric
surgery included [10, 25–27].
In a systematic review, Shoar et al. discuss 7 studies that have reported outcomes of bariatric surgery in a total of 43 IBD patients of whom 58% suffered
from Crohn’s disease [27]. Crohn’s patients more often underwent SG (72%),
while those with ulcerative colitis underwent SG or RYGB in similar frequency
(44%). Overall between 8 and 77 months after bariatric surgery, IBD patients had
an average 71% excess weight loss (EWL) and a 14.3 kg/m2 drop in body mass
index (BMI) [27].
In a recent prospective cohort study, Xu et al. report on the 1-year outcomes of
obese patients suffering from rheumatoid arthritis who underwent bariatric surgery
(n = 32) and compared them to an obese non-surgical group (n = 33) [28]. In the
surgical arm, 41% of patients underwent SG procedure and the rest had RYGB. At
one-year, bariatric surgery yielded an average 33 kg weight loss equivalent to 11.3
2
drop in BMI [28].
kg/m
In terms of long-term weight loss after SG procedure in the general population,
a 40–60% EWL or a mean BMI reduction of 8–10 kg/m2 are realistic estimates
to consider [29–31]. Moreover, long-term improvements in obesity-related conditions especially metabolic syndrome including type 2 diabetes mellitus after SG
are impressive and occur in >60% of patient population [6, 30, 31]. When comparing long-term outcomes of SG to RYGB, a recent meta-analysis of 4 randomized
control trials with reported 5-year outcomes of SG and RYGB procedures revealed
that weight loss up to 5 years after surgery has been either comparable or favoring
RYGB with only a modest difference in BMI (1–2 kg/m2) and weight loss up to
5 kg [7]. Moreover, five years after surgery, the remission rate of type 2 diabetes
mellitus was similar between SG and RYGB (55% vs. 60%, respectively; p = 0.42)
[7]. Hence, SG procedure is highly effective for weight loss and improving

Sleeve Gastrectomy in Immunocompromised Patients
143
obesity-related conditions. Finally, as demonstrated above the weight loss and
related comorbidity outcomes after SG procedure appear to be similar among the
immunocompromised patients and the general population.
3.2 Changes to Rheumatoid and Autoimmune Conditions
Obesity is common among patients with rheumatoid and autoimmune disorders
such as rheumatoid arthritis and IBD [32, 33]. Moreover, obese patients with
these conditions often have worse response to therapy after all types of DMARDs
[34–36]. This association is not very surprising as obesity is linked to an increase
in a pro-inflammatory state mediated by known cytokines such as interleukin-6,
TNF-α, as well as adipokines such as leptin, adiponectin, and resistin, or neuropeptides such as substance P, which are all molecules either produced within
adipocytes or within macrophages and lymphocytes that infiltrate the mesenteric
fat [37, 38]. Consequently, since both obesity and autoimmune disorders share a
chronic inflammatory state, the advantage of bariatric/metabolic surgery in alleviating severity of such conditions is not surprising.
Various studies have demonstrated the improvement in many autoimmune disorders after bariatric surgery. In a study using 2004–2014 United States National
Inpatient Sample database, Sharma et al. identified 15,319 morbidly obese patients
who had a combined discharge diagnosis of IBD, of whom 3.2% (n = 493) had
prior bariatric surgeries (47% underwent SG; n = 233) [39]. They found that a
prior bariatric surgery was associated with lower incidence rate ratios for renal
failure, malnutrition, and fistulae formation compared to obese non-surgical group
[39]. The systematic review by Shoar et al. mentioned earlier evaluating outcomes of bariatric surgery in 43 IBD patients, of whom 58% had Crohn’s disease
mainly involving the small bowel, reported disease remission in 20 patients (48%),
improvement in another two individuals (5%), but disease exacerbation was noted
in 17% [27]. Interestingly, intestinal bacterial overgrowth that can develop due
to bypass-type bariatric procedures like RYGB, may be associated with acute
flare-ups of Crohn’s disease [40, 41]. Also, there is a potential risk of flare-up crises in patients with small bowel Crohn’s disease, involving the operated segments
of the small bowel after RYGB. Thus, one might argue that for obese patients
with Crohn’s disease especially those with small bowel involvement and previous
bowel resections, SG should be the bariatric procedure of choice.
Similar association and improvements were shown after bariatric surgery for
patients with other rheumatoid disorders including gout, psoriasis, systemic lupus
erythematosus, multiple sclerosis, and rheumatoid arthritis [42–46]. As mentioned
above, in a prospective cohort study, Xu et al. reported on 1-year outcomes of
obese patients suffering from rheumatoid arthritis who underwent bariatric surgery
(41% had SG surgery) compared to an obese non-surgical group [28]. At 1-year
follow-up and compared to obese controls, patients who underwent bariatric surgery, showed significantly better American College of Rheumatology 20/50/70

A. Andalib144
(ACR 20/50/70) criteria and the weight loss after surgery was associated with
lower disease activity [28].
Finally, although bariatric procedures are shown to improve outcomes of obese
patients with rheumatoid disorders, bariatric surgery could also lead to some deleterious effects especially with respect to bone metabolism and is associated with
an elevated risk of fractures [46]. SG is shown to have a less negative impact on
bone metabolism compared to bypass-type procedures like RYGB or duodenal
switch [47–49]. Thus, in the absence of any contraindication like severe gastroesophageal reflux disease, SG may once again be a better procedure choice in the
immunocompromised patients due to rheumatoid disorders.
4 Summary
In summary, while studies on the perioperative use of immunosuppressive agents
in patients undergoing bariatric surgery are lacking, the use of these medications
in this population are not. The timing and the risk of withholding immunosuppressant medications should be weighed against the benefits of their use in each case
and in a multi-disciplinary fashion. If medically possible prior to elective bariatric surgery, one should aim to hold immunosuppressants 2–12 weeks preoperatively and until 2–4 weeks after surgery. When applicable, for some DMARDs like
TNF-α inhibitors, the timing of the surgery should be planned according to the last
dose since most agents are administered every 2–8 weeks and if needed only one
dose can be skipped after surgery. The beneficial outcomes of SG including weight
loss and improvements in obesity-related conditions in the immunocompromised
patients are comparable to those in immunocompetent individuals. Furthermore,
given that both obesity and rheumatoid/autoimmune disorders share a chronic
inflammatory state, it is not surprising that a reduction in obesity-induced inflammation after SG can lead to improvements in these conditions requiring immunosuppressive therapy.
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