Evaluation of Weight Loss Indicators and Laparoscopic One-Anastomosis Gastric Bypass Outcomes

Abstract

Mini-gastric bypass/One-anastomosis gastric bypass (MGB-OAGB) is an effective bariatric technique for treating overweight and obesity, controlling and improving excess-weight-related comorbidities. Our study evaluated OAGB characteristics and resulting weight evolution, plus surgical success criteria based on various excess weight loss indicators. A prospective observational study of 100 patients undergoing OAGB performed by the same surgical team (two-year follow-up). Surgical characteristics were: surgery duration, associated complications, bowel loop length, hospital stay, and weight loss at 6 postoperative points. 100 patients were treated (71 women, 29 men); mean initial age was 42.61 years and mean BMI, 42.61 ± 6.66 kg/m². Mean surgery duration was 97.84 ± 12.54 minutes; biliopancreatic loop length was 274.95 ± 23.69 cm. Average hospital stay was 24 hours in 98% of patients; no surgical complications arose. Weight decreased significantly during follow-up (P < 0.001). Greatest weight loss was observed at 12 months postsurgery (68.56 ± 13.10 kg). Relative weight loss showed significant positive correlation, with greatest weight loss at 12 months and %excess BMI loss > 50% achieved from the 3-month follow-up in 92.46% of patients. OAGB seems to be effective in treating obesity, with short hospital stays. Relative weight loss correlates optimally with absolute outcomes, but both measures should be used to evaluate surgical results.

Figure 1

Graphic representation of the OAGB technique.

Figure 2

Postsurgery Evolution of %EWL and %EBMIL. Pearson’s correlation coefficient between %EWL and %EBMIL %EWL = percent excess weight loss; %EBMIL = percent excess body mass index. *P < 0.001 compared with the pre-surgery control. + P < 0.001 compared with the previous control. No patients were lost to follow-up.

Figure 3

Result of bariatric surgery cataloguing based on postsurgery weight loss. Failure: %EBMIL < 50%; Good: %EBMIL = 50%-65%; Excellent: %EBMIL > 65%. No patients were lost to follow-up.