Which Baseline Weight Should Be Preferred as Reference for Weight Loss Results, Insights in Bariatric Weight Loss Mechanisms by Comparing Primary and Revision Gastric Bypass Patients

摘要

Background Bariatric weight loss essentially is expressed with reference to the baseline weight, for example, as relative percentages or as absolute body mass index (BMI) points lost from baseline. A different definition of baseline weight would therefore affect all weight loss results. We try to determine which value to prefer for baseline weight in weight loss surgery: the accidental weight at time of operation or the patient-specific steady weight, reflecting a steady personal craving for calories that is independent of the operation. Methods Nadir percentage alterable weight loss (%AWL) outcome of all primary gastric bypass patients in our hospital with a 2-year follow-up is compared twice with nadir %AWL outcome of all revision gastric banding-to-bypass patients: relative to their BMI before their banding and before their banding-to-bypass (Mann-Whitney; p<0.05).