Indications, Techniques, and Outcomes of Surgical Reversal Strategies after Roux-en-Y Gastric Bypass: A Systematic Review
In brief
Roux-en-Y reversal brings complications in 39% of patients within 30 days
Across 12 studies, reversal for problems such as severe low blood sugar, malnutrition, and chronic abdominal symptoms was followed by a complication in about 39% of patients and another operation in 15%; early mortality was 0.68%. Evidence was very low certainty, follow-up was often incomplete, and no best surgical technique emerged, leaving benefits and risks difficult to compare.
- Journal
- Obesity surgery (Q1)
- Published
- 31 October 2026
- Study design
- Systematic review of cohort studies
- Evidence level
- Level 2, Moderate (CEBM 2a)
- Authors
- Ala Wafa, Bruno Dillemans, Suleiman Naji, Mahmoud Diaa Hindawi, Dina M Hafez, Mohamed Hany
- PMID
- 42963534
- DOI
- 10.1007/s11695-026-09005-5
Why clinicians should know about it
- Picked for Bariatric and Metabolic Surgery (paper of the day, 3 November 2026): Directly addresses complications and reversal after gastric bypass
Abstract
Reversal of Roux-en-Y gastric bypass (RYGB) is undertaken for severe, treatment-refractory complications. Four bibliographic databases were searched to 5 May 2026, yielding 12 included studies and 469 publication-level patients, with confirmed cohort overlap in three publication pairs. Hypoglycemia after metabolic bariatric surgery (MBS) was the most frequently reported indication, followed by malnutrition and chronic abdominal symptoms. Techniques comprised normal-anatomy restoration, added sleeve gastrectomy, or individualized reconstruction. Pooled 30-day reoperation was 15.0% (95% CI 9.3-23.3%) and any 30-day complication 38.9% (26.7-52.6%); early mortality was 0.68% (2/295). Follow-up was incomplete: 58% were lost by one year in the largest series. Certainty was very low throughout. RYGB reversal may relieve refractory complications but carries substantial morbidity; no optimal technique is identifiable, and prospective, indication-stratified studies are required.
Abstract as published, via PubMed.
For healthcare professionals. The summary is generated by AI from the published abstract, and the evidence level is assigned automatically from the study design on the Oxford CEBM hierarchy. Neither is medical advice. Read the full paper before changing practice.