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Obes Surg. 2014 Jun;24(6):841-6. doi: 10.1007/s11695-014-1180-7.

Greater weight loss with the omega loop bypass compared to the Roux-en-Y gastric bypass: a comparative study.

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Department of Endocrinology, Diabetology and Nutrition, Specialized and Integrated Center for Obesity Management, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, 165, Chemin du Grand Revoyet, 69495, Pierre Bénite, France.



Despite similar initial results on weight loss and metabolic control, with a better feasibility than the Roux-en-Y gastric bypass (RYGBP), the omega loop bypass (OLB) remains controversial. The aim of this study was to compare the short-term outcomes of the laparoscopic OLB versus the RYGBP in terms of weight loss, metabolic control, and safety.


Two groups of consecutive patients who underwent laparoscopic gastric bypass surgery were selected: 20 OLB patients and 61 RYGBP patients. Patients were matched for age, gender, and initial body mass index (BMI). Data concerning weight loss, metabolic outcomes, and complications were collected prospectively.


Mean duration of the surgical procedure was shorter in the OLB group (105 vs. 152 min in the RYGBP group; p < 0.001). Mean excess BMI loss percent (EBL%) at 6 months and at 1 year was greater in the OLB group (76.3 vs. 60.0%, p = 0.001, and 89.0 vs. 71.0%, p = 0.002, respectively). After adjustment for age, sex, initial BMI, and history of previous bariatric surgery, the OLB procedure was still associated with a significantly greater 1-year EBL%. Diabetes improvement at 6 months was similar between both groups. The early and late complication rates were not statistically different. There were three anastomotic ulcers in the OLB group, in smokers, over 60 years old, who were not taking proton pump inhibitor medication.


In this short-term study, we observed a greater weight loss with OLB and similar efficiency on metabolic control compared to RYGBP. Long-term evaluation is necessary to confirm these outcomes.

[Indexed for MEDLINE]

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