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Table 1 Summary of the characteristics and the associated risks of different bariatric operations

From: The impact and treatment of obesity in kidney transplant candidates and recipients

Operation Weight loss mechanism Volume of gastric pouch (ml) Length of bypassed small bowel (cm) Expected EWL (%) Physiological risks in the general population Post-bariatric surgery nutritional supplementation
Restrictive Malabsorption Hormonal
Sleeve gastrectomy +   + 100 - 150 0 50 - 60 GERD, B12-deficiency anemia MV, Ca
Gastric bypass + + + 15 - 30 130 - 180 60 - 70 Peptic ulcers, anemia, osteoporosis, dumping syndrome, kidney stones MV, B12, Fe, Ca, vit D
Bilio-pancreatic diversion and duodenal switch + + + 100 - 250 250 - 300 70 - 80 Diarrhea/steatorrhea, anemia, vitamin deficiencies MV, B12, Fe, Ca, vitamins A, D, E
Adjustable gastric band +    30 0 20 - 40 Band erosion or migration Nil