Outcomes and Safety of One Anastomosis Gastric Bypass (OAGB): A Three-Year Retrospective Study.

BACKGROUND

One-Anastomosis Gastric Bypass (OAGB) has become an established bariatric procedure globally, known for its technical simplicity and favorable outcomes. Despite its increasing adoption, OAGB remains under scrutiny for long-term safety and efficacy.

OBJECTIVE

This study aims to evaluate the clinical outcomes, safety, and resolution of obesity-related comorbidities following OAGB with a biliopancreatic limb (BPL) of 150 cm length, performed in a single center, over a three-year period.

METHODS

This retrospective study included all patients who underwent laparoscopic OAGB between October 2020 and October 2023. The procedure was standardized with a BPL of 150 cm length. Data were collected and analyzed retrospectively to assess weight loss outcomes, resolution of comorbidities, and perioperative and late complications.

RESULTS

Overall, 102 patients underwent OAGB during the study period, with 76% being female and a mean age of 35.7 ± 8.34 years. The mean preoperative weight and body mass index (BMI) were 125 ± 16.2 kg and 46 ± 7.6 kg/m, respectively. The total weight loss (TWL) was 32,78 ± 5.57% at one year, 37,45 ± 4.36% at two years, and 37,85 ± 4.74% at three years. Significant improvements were noted in obesity-related comorbidities: 92% of patients with type 2 diabetes (T2D) experienced remission at one year, sustained at three years in 82%. Early complications were observed in 3.92% of cases, while late complications occurred in 7.84%, with no postoperative deaths or internal hernia reoperations during the three-year follow-up. Iron and ferritin deficiencies were identified in 4.9%, hypoalbuminemia (< 35 g/l) in 1.96%, and anemia (< 12 g/dl) in 4.9% of patients, with no patients requiring revision for malnutrition.

CONCLUSION

OAGB demonstrates high efficacy in achieving substantial weight loss and resolving comorbidities, with an acceptable safety profile when using a BPL of 150 cm. The findings support the continued adoption of OAGB as a primary bariatric surgery when performed with standardized techniques and multidisciplinary follow-up.