Clinical Scorecard: Comparative Study of Single Anastomosis Duodeno-ileostomy (SADI-S) and One Anastomosis Gastric Bypass (OAGB-MGB) as Revisional Options for Patients Experiencing Weight Regain Post-Sleeve Gastrectomy: Efficacy and Outcome Assessment

At a Glance

Key Highlights

• SADI-S is a technically simpler revisional procedure than classic duodenal switch with fewer anastomoses and similar weight loss outcomes.
• OAGB-MGB is a well-tolerated and effective revisional option with long-term efficacy reported.
• Comparative studies between SADI-S and OAGB-MGB as revisional procedures post-LSG are limited; this study provides short-to-medium term (≥1 year) outcome data.

Guideline-Based Recommendations

Diagnosis

• Identify weight regain post-LSG using BMI, excess weight loss percentage (EWL%), and total weight loss percentage (TWL%) with baseline pre-revisional surgery weight.
• Assess metabolic comorbidities including type 2 diabetes (T2D), hypertension, and gastroesophageal reflux disease (GERD) clinically and with investigations such as OGD and upper GI series.
• Define remission of T2D as HbA1c < 6.5% and/or fasting glucose < 100 mg/dl; remission of hypertension as blood pressure < 130/90 mmHg off medications.

Management

• Consider SADI-S or OAGB-MGB as revisional surgical options for patients with weight regain after LSG.
• Perform SADI-S with division of first part of duodenum 2–4 cm distal to pylorus and end-to-side duodeno-ileostomy with 250–300 cm ileal limb.
• Perform OAGB-MGB by creating a gastric pouch and antecolic gastro-jejunal anastomosis with 150–200 cm jejunal limb.
• Postoperative care includes liquid diet with protein supplements for 2 weeks, proton pump inhibitors for 3 months, and routine multivitamin supplementation.

Monitoring & Follow-up

• Monitor weight loss parameters (BMI, EWL%, TWL%) at 1 year post-revisional surgery.
• Evaluate metabolic profile and obesity-related comorbidities pre- and postoperatively.
• Regularly assess blood markers including hemoglobin, serum proteins, calcium, lipids, vitamins B12 and D, ferritin, iron, zinc, and INR.
• Monitor for postoperative complications such as bleeding, anastomotic leak, ulcers, abdominal collections, internal herniation, vitamin deficiencies, and defecation abnormalities.

Risks

• Potential postoperative complications include bleeding, anastomotic leakage, anastomotic ulcers, abdominal collections, internal herniation, and nutritional deficiencies.
• Defecation complaints such as obstipation or steatorrhea may occur postoperatively.

Patient & Prescribing Data

Patients undergoing revisional bariatric surgery for weight regain after LSG

Both SADI-S and OAGB-MGB show efficacy in weight loss and metabolic improvement at minimum 1-year follow-up; choice depends on surgical expertise and patient-specific factors.

Clinical Best Practices

• Use standardized definitions for remission of T2D and hypertension to assess outcomes.
• Perform methylene blue leak test intraoperatively for anastomosis integrity in both procedures.
• Avoid routine use of drains postoperatively unless clinically indicated.
• Provide uniform postoperative dietary and supplementation protocols to optimize recovery and nutritional status.
• Select patients carefully for revisional surgery based on weight regain severity and comorbidity status.

References

• Bariatric surgery efficacy and durability overview
• Weight regain after sleeve gastrectomy and revisional surgery necessity
• SADI-S as a revisional procedure outcomes
• OAGB-MGB revisional surgery efficacy
• GERD symptom scoring and resolution criteria