Part I - Introduction -- A Brief History of the Duodenal Switch -- Duodenal Switch. Mechanisms of functioning -- Duodenal Switch and Its Derivatives -- Primary Single Anastomosis Duodenal Switch: Perspective from a Lengthy Experience -- Duodenal Switch and Its Derivatives in Bariatric and Metabolic Surgery -- Part II - Weight Loss Surgery -- Pathophysiology of the cardiometabolic alterations in obesity -- Pathophysiology of bile acid regulation -- Nonalcoholic steatohepatitis (NASH) -- Patient Selection -- Psychological and Psychiatric Work Up -- Nutritional, Behavioral, and Support for Duodenal Switch -- Preoperative endoscopy -- Postoperative care -- Preoperative Testing and Counseling -- Risk Assessment and Reduction -- Airway Evaluation and Management -- Patient Positioning and Positioning for Bariatric Surgery -- Intraoperative Monitoring Of The Morbidly Obese Patient -- Method of anesthesia: gas selection and adjunct medications -- Regional Anesthesia in Bariatric Surgery -- Multimodal Analgesia inBariatric Surgery -- Anatomical Considerations -- Robotic Duodenal Switch and SADI-S: Technical Aspects -- Laparoscopic Biliopancreatic Diversion with Duodenal Switch: Surgical technique -- SADIS - Technical details -- Technical Aspects of Single Anastomosis Duodenal Switch-SIPS Version -- Duodenal Bipartition or Side-to-Side Duodeno-Ileostomy. Rationale and Technical Details -- Duodenoileal anastomosis with handsewn technique -- Circular Anastomosis in Duodenal Switch -- Duodenoileal anastomosis with linear stapler technique -- Staged Duodenal Switch for High-Risk Patients -- Duodenal Switch, SADI and SIPS in Adolescent -- Duodenal Switch (DS), Single Anastomosis Duodeno-Ileal bypass (SADI) and Stomach Intestinal Pylorus-Sparing (SIPS) Surgery in the Elderly -- Right Gastric Artery Ligation: The Brazilian Results -- Surgery Failure: what are the options? -- Causes of Weight Regain After Duodenal Switch and its Derivatives -- Revisional Surgery for Weight Regain -- Conversion of Sleeve Gastrectomy toDuodenal Switch and SADI-S -- Gastric Band Revision to Duodenal Switch -- Endoscopic Treatment of Weight Regain in Duodenal Switch -- Conversion of Gastric Bypass to Duodenal Switch -- Management of Duodenal Stump blowout -- Duodenoileal anastomosis testing -- Closing the mesenteric defects -- Preventing Surgical Complications -- Malabsorbative complications -- Postoperative Psychological Assistance -- Surgical Management of Leaks -- Internal Hernias and Bowell Obstruction -- Management of Portal Vein Thrombosis Following Bariatric Surgery -- Gallstones and Choledocholithiasis -- Hyperinsulinemic postprandial hypoglycemia after duodenal switch -- Diarrhea after Duodenal Switch: Medical and Surgical Management -- Endoscopic Treatment of Complications -- Global analyisis of our experience with hypoabsortive tecnique: > 500 cases DS vs SADI-S -- Body Contouring after Duodenal Switch -- Bariatric Surgery Population in the ICU -- Bariatric Emergencies For The General Surgeon -- Robotic bariatric surgeon training -- Part III - Metabolic and Diabetes Type 2 Surgery -- Mechanisms of control of diabetes 2 with duodenal switch -- The Evolution of Single anastomosis Duodenal Switch -- Metabolic Syndrome Control and the influence of hormonal changes post-Duodenal Switch (DS) -- Staged Duodenal Switch for High-Risk Patients -- Duodenal Switch in Patients with Metabolic Syndrome -- Duodenal Switch (DS) for the Surgical Treatment of Diabetes and Metabolic Disease -- Postoperative care -- Metabolic Syndrome and the Influence of Bile Acids.