LAUSR

Abstract Introduction The aim of this work is to analyze the weight evolution of the main bariatric surgical techniques (Roux-en-Y gastric Bypass-RYGB and Sleeve Gastrectomy-SG) performed in a representative sample of Spanish centers, in order to make a percentiles charts of the percentage of total weight loss during the first 3 years after surgery. Methods A retrospective longitudinal cohort study was conducted based on the data provided by 9 Spanish hospitals. Weight data were analyzed both in %TWL (total weight loss) and %EWL (excess weight lost) corresponding to the RYGB (n = 1887) and SG (n = 1210). Results BPGY remains the most frequently performed technique in our national sample. In both surgical techniques, maximum weight loss occurs 18 months after surgery. Both techniques follow the same weight evolution, although the %TWL values are lower in the case of the SG at 36 months (% TWL RYGB = 33.6 ± 10 vs %TWL GV = 29.3 ± 10). Age and gender are decisive in the weight results (better in younger patients for both techniques and better in women for BPGY) Conclusions Percentile charts of % TWL after bariatric surgery represent a very useful tool and an important advance in the quality of patient management.