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Life sciences · Observational Study
ClinicalTrials.gov · September 14, 2026
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Observational Study.
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Registry record from ClinicalTrials.gov (NCT07818317). This is a study registration, not published results. Lead sponsor: The Society of Bariatric and Metabolic Surgeons of Kazakhstan. Recruitment status: NOT_YET_RECRUITING. Study type: OBSERVATIONAL. Enrollment: 120 participants (ESTIMATED). Conditions: Obesity, Severe Obesity, Metabolic Disease. Interventions: PROCEDURE: One-anastomosis gastric bypass with observed biliopancreatic limb length. Primary outcome measures: Percent total weight loss at 12 months after OAGB , 12 months after OAGB; Incremental out-of-sample predictive contribution of P_JI for 12-month percent total weight loss , From model development through external validation; primary clinical endpoint assessed at 12 months after OAGB. Brief summary: This prospective observational cohort study will develop and externally validate a human-supervised, explainable artificial-intelligence decision-support model for analysing factors associated with biliopancreatic limb length selection during one-anastomosis gastric bypass (OAGB). The study will record three prespecified factors: the percentage of the laparoscopic instrument segment J-I covered by visceral or omental fat (P\_JI = 100 × FI/JI), the measured total small-bowel length (TSBL), and the abdominal integral index (AII = (CD/AC) + (CG/EG) + (JI/FI)). The study will evaluate weight-loss effectiveness, nutritional and malabsorptive outcomes, bile/acid reflux, major complications, and technical feasibility. During model development, the AI system will not autonomously assign a BPL length. The operating bariatric surgeon will make the clinical decision, and the model will be evaluated for calibration, external validity, factor contribution, safety constraints, and abstention.