• Nienke Slagter, Lindsy van der Laan, de HeideLoek J MLJMCenter for Obesity Northern Netherlands, Department of Bariatric and Metabolic Surgery, Medical Center Leeuwarden, Leeuwarden, The Netherlands.Department of Surgery, Medical Center Leeuwarden, Leeuwarden, The Netherlands., Ewoud H Jutte, Mirjam A Kaijser, Stefan L Damen, André P van Beek, and Marloes Emous.
• Center for Obesity Northern Netherlands, Department of Bariatric and Metabolic Surgery, Medical Center Leeuwarden, Leeuwarden, The Netherlands.
• Br J Surg. 2024 Aug 30; 111 (9).

BackgroundTailoring the biliopancreatic limb length in one anastomosis gastric bypass is proposed as beneficial in retrospective studies, yet randomized trials are lacking. The aim of this double-blind, single-centre RCT was to ascertain whether tailoring biliopancreatic limb length based on total small bowel length (TSBL) results in superior outcomes after one anastomosis gastric bypass compared with a fixed 150 cm biliopancreatic limb length.MethodsEligible patients, meeting International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO) criteria for metabolic bariatric surgery, scheduled for primary one anastomosis gastric bypass surgery, and willing to be randomized, underwent TSBL measurement during surgery. When TSBL measurement was feasible, patients were randomly assigned to a standard 150 cm biliopancreatic limb length or a tailored biliopancreatic limb based on TSBL: TSBL less than 500 cm, biliopancreatic limb 150 cm; TSBL 500-700 cm, biliopancreatic limb 180 cm; and TSBL greater than 700 cm, biliopancreatic limb 210 cm. The primary outcome was percentage total weight loss at 5 years.ResultsBetween September 2020 and August 2022, 212 patients were randomized into the standard biliopancreatic limb group (105 patients) or the tailored biliopancreatic limb group (107 patients). The mean(s.d.) TSBL was 657(128) cm (range 295-1020 cm). In the tailored group, 150, 180, and 210 cm biliopancreatic limb lengths were applied to 8.4%, 53.3%, and 38.3% of patients respectively. The mean(s.d.) 1-year percentage total weight loss was 32.8(6.9)% in the standard group and 33.1(6.2)% in the tailored group (P = 0.787). Nutritional deficiencies and short-term complications showed no significant differences.ConclusionTailoring biliopancreatic limb length based on TSBL is safe and feasible. One year after surgery, it is not superior to a standard biliopancreatic limb length of 150 cm in terms of percentage total weight loss.Registration NumberDutch Trial Register, NL7945.© The Author(s) 2024. Published by Oxford University Press on behalf of BJS Foundation Ltd.

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