Efficacy of One Anastomosis Gastric Bypass Versus Sleeve Gastrectomy and Roux-en-Y Gastric Bypass for the Treatment of Type 2 Diabetes Mellitus: a Systematic Review and Meta-Analysis of Randomized Clinical Trials.

The worldwide prevalence of type 2 diabetes mellitus (T2DM) is increasing in parallel with obesity. One anastomosis gastric bypass (OAGB) is considered effective to treat both T2DM and obesity. The aim of this study was to evaluate the efficacy of OAGB versus sleeve gastrectomy (SG) and Roux-en-Y gastric bypass (RYGB) for treatment of T2DM, analyzing data exclusively from randomized control trials (RCTs). Α systematic review of published RCTs comparing OAGB versus RYGB or SG (control groups) in T2DM patients regarding diabetes remission and weight loss was performed. Primary endpoints were T2DM remission rate and 1-year and 5-year % weight loss postoperatively. Initial search identified 39 references, of which 8 RCTs were considered eligible for meta-analysis inclusion, comprising 636 patients (311 OAGB, 122 RYGB, 203 SG patients). Main meta-analysis findings were: i) higher 1-year %EWL for OAGB than control group (p = 0.04); ii) higher 5-year %EWL for OAGB than control group (p < 0.01); iii) no difference in 1-year remission rate of T2DM between OAGB and control group (p = 0.14); iv) 28% higher 5-year remission rate of T2DM for OAGB than control group (p < 0.01). OAGB had statistically significant better outcomes compared to RYGB and SG regarding T2DM remission and %EWL at 5 years. Further pathophysiologic studies are needed to indicate the most potent bariatric procedure in patients with T2DM and obesity.