Anatomic Reversal of Gastric Bypass as a Last Resort for Refractory Complications: A Retrospective Case Series

Gastric bypass procedures are highly effective for severe obesity management, but a small subset of patients develop devastating complications refractory to medical management. This study evaluates the outcomes of complete reversal to normal anatomy following failed gastric bypass.

We conducted a retrospective case series of 13 patients (0.9% of 1,450 bypass patients) who underwent complete laparoscopic reversal to normal anatomy between 2020 and 2024. Indications included severe malnutrition after one-anastomosis gastric bypass (OAGB) (n = 5), intractable marginal ulcers after Roux-en-Y gastric bypass (RYGB) (n = 4), and severe dumping syndrome after RYGB (n = 4). We assessed operative outcomes, symptom resolution, nutritional markers, and weight changes at 1-year follow-up.

The cohort was predominantly female (76.9%) with a mean age of 42.1 ± 2.2 years. Mean time to reversal was 1.9 ± 0.6 years. Mean operative time was 76.0 ± 6.2 min with zero intraoperative complications. All patients (100%) achieved complete resolution of their primary complication. In the malnutrition cohort, serum albumin improved from 2.16 ± 0.11 g/dL to 3.84 ± 0.10 g/dL (p < 0.001), and hemoglobin improved from 9.12 ± 0.31 g/dL to 12.64 ± 0.35 g/dL (p < 0.001). However, mean BMI increased significantly from 23.9 ± 1.8 kg/m² to 31.8 ± 1.2 kg/m² (p < 0.001), with 84.6% of patients returning to a BMI > 30 kg/m² at one year.

Complete reversal to normal anatomy is a safe and highly effective treatment for severe, refractory complications of gastric bypass, providing symptom resolution. However, it is universally associated with significant weight regain, necessitating careful patient selection, preoperative counseling, and aggressive postoperative weight management.