One Anastomosis/Mini-Gastric Bypass (OAGB/MGB) as Revisional Surgery Following Primary Restrictive Bariatric Procedures:

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One Anastomosis/Mini-Gastric Bypass (OAGB/MGB) as Revisional Surgery Following Primary Restrictive Bariatric Procedures: a Systematic Review and Meta-Analysis Mohammad Kermansaravi 1 & Shahab Shahabi Shahmiri 2 & Amir Hossein DavarpanahJazi 2 & Rohollah Valizadeh 3 & Giovanna Berardi 4 & Antonio Vitiello 4 & Mario Musella 4 & Miguel Carbajo 5 Received: 18 August 2020 / Revised: 19 October 2020 / Accepted: 21 October 2020 # The Author(s) 2020

Abstract One anastomosis gastric bypass (OAGB/MGB) has gained popularity in the past decade. International databases were searched for articles published by September 10, 2020, on OAGB/MGB as a revisional procedure after restrictive procedures. Twenty-six studies examining a total of 1771 patients were included. The mean initial BMI was 45.70 kg/m2, which decreased to 31.52, 31.40, and 30.54 kg/m2 at 1, 3, and 5-year follow-ups, respectively. Remission of type-2 diabetes mellitus (T2DM) following OAGB/MGB at 1-, 3-, and 5-year follow-up was 65.16 ± 24.43, 65.37 ± 36.07, and 78.10 ± 14.19%, respectively. Remission/ improvement rate from gastroesophageal reflux disease (GERD). Also, 7.4% of the patients developed de novo GERD following OAGB/MGB. Leakage was the most common major complication. OAGB/MGB appears to be feasible and effective as a revisional procedure after failed restrictive bariatric procedures. Keywords One anastomosis gastric bypass (OAGB/MGB) . Gastric bypass . Weight regain . Weight loss . Conversion

Introduction In last years, bariatric surgery has proven to be the most effective treatment for morbid obesity and obesity-related Supplementary Information The online version contains supplementary material available at https://doi.org/10.1007/s11695-02005079-x. * Mario Musella [email protected] 1

Department of Surgery, Minimally Invasive Surgery Research Center, Division of Minimally Invasive and Bariatric Surgery, Rasool-e Akram Hospital, Iran University of Medical Sciences, Tehran, Iran

2

Minimally Invasive Surgery Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

3

Department of Epidemiology, Student Research Committee, School of Public Health, Iran University of Medical science, Tehran, Iran

4

Advanced Biomedical Sciences Department, “Federico II” University, Naples, Italy

5

Centre of Excellence for the Study and Treatment of Obesity and Diabetes, Valladolid, Spain

diseases, providing long-standing effects and presenting a very low complication rate [1–3]. One anastomosis gastric bypass was firstly introduced by Rutledge as mini-gastric bypass (MGB) in 2001 [4] and subsequently modified as OAGB by Carbajo in 2005 [5]. It is currently an accepted bariatric procedure named as OAGB/MGB by IFSO [6], which has gained increasing popularity among bariatric surgeons worldwide [7]; efficacy and safety of primary OAGB/MGB have been reported in many different papers [8–12]. Due to the growing request for revisional bariatric surgery that recorded a steep increase in last years, rising from 6 to 13.6% of all bariatric procedur