Additional gastric resection after one anastomosis gastric bypass-are there benefits?

Background/aim: Mini/one anastomosis gastric bypass (MGB-OAGB) is a bariatric surgery procedure that has proved effective for weight loss and the resolution of metabolic disorders. The present study evaluates the effect on postoperative outcomes of resecting the corpus and fundus as an addition to OAGB. Materials and methods: This retrospective study recorded and evaluated the data of 83 patients who underwent laparoscopic OAGB due to morbid obesity (Body Mass Index-BMI >= 40 kg/m2) in our clinic between January 2018 and January 2020. The patients were divided into two groups: the first group comprised patients undergoing standard OAGB (n = 49), while the second group included those undergoing OAGB plus (OAGB with additional corpus and fundus resection) (n = 34). The patient data recorded for comparison included demographic characteristics, comorbidities, preoperative and postoperative weight (at 6 and 12 months), body mass index (BMI), excess weight loss% (EWL%), excess BMI loss% (EBL%), and total body weight loss% (TBWL%), hemoglobin, fasting blood glucose (FBG), albumin and HbA1c levels. Results: There was no statistically significant difference between the two groups with regard to age, gender or comorbidities. The operating time, the number of cartridges used during the operation and the length of hospital stay were statistically higher in the OAGB plus group (p = 0.039, p < 0.001, p < 0.001, respectively). No statistically significant difference was seen between the groups regarding weight, BMI, EBL% and TBWL% preoperatively and at 6-and 12-months postsurgery. There was also no statistically significant difference in preoperative and postoperative (at months 6 and 12) levels of hemoglobin, FBG, albumin, and HbA1c between the two groups. Conclusion: The addition of resection of the gastric fundus and corpus to an OAGB has no impact on postoperative weight loss or metabolic outcomes.