The aim of this study was to determine whether longer limb length improved results of gastric bypass in patients who were morbidly obese (body mass index <50 kg/m(2)) or superobese (body mass index >50 kg/m(2). A total of 242 patients were followed for a mean of 5.5 years. The standard operation was a Roux-en-Y gastric bypass with a 40 cm Roux limb and a 10 cm afferent limb. The long-limb operation had a 100 cm Roux limb and a 100 cm afferent limb. Morbidly obese patients did not benefit from a long-limb bypass. The final body mass index was 28.6 +/- 4.7 kg/m(2) in the short-limb group and 28.5 +/- 3.8 kg/m(2) in the long-limb group. The superobese patients did benefit from a long-limb bypass. Final body mass index was 35.8 +/- 6.7 kg/m(2) in the short-limb patients and 32.7 +/- 5.1 in the long-limb patients (P = 0.049). A subgroup of 20 patients, all of whom had a body mass index greater than 60 kg/m(2), benefited the most from long-limb bypass. No macronutritional side effects unique to the long-limb bypass were encountered.
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