RESUMO
OBJECTIVES: To assess remission of type 2 diabetes mellitus (T2DM) after bariatric surgery, to analyze potential conditioning factors, and to compare Spanish and American remission criteria. MATERIAL AND METHODS: A retrospective study of diabetic patients undergoing Roux-en-Y gastric bypass from 2009 to 2015. Data collected included age, sex, time since T2DM diagnosis, antidiabetic drugs, insulin (type and dose), weight and BMI, percent excess weight lost, HbA1c, blood glucose levels, and course of T2DM after surgery according to Spanish and American criteria, including a descriptive analysis and correlation between both. RESULTS: The study sample consisted of 106 patients. Outcomes one year after surgery was as follows (Spanish criteria): complete remission 65.9%, partial remission 5.5%, improvement 18.9%, no change 9.7% (at 5 years: 68.4, 5.3, 10.5, and 15.8%, respectively). Outcomes according to ADA criteria were as follows: complete remission 61.5%, partial remission 5.3%, and no remission 28.6% (after 5 years, complete remission 68.4%). There was a good correlation between both classifications (Rho=0.974; P<.001). Mean HbA1c levels: 7.3±1.8% at baseline; 5.7±1% at one year; 6.3±1.2% at 5 years. Chance of remission was lower in patients aged over 50 years (54.4 vs. 88.2%; P=.001), with T2DM diagnosed more than 10 years before (26.3 vs. 81.8%; P<.001), on insulin treatment (31.3 vs. 87.9%; P<.001), and with HbA1c levels≥8% (40 vs. 77%; P=.001). CONCLUSIONS: At our hospital, bariatric surgery is associated to a high remission rate of T2DM in patients with morbid obesity, with a good correlation between Spanish and American criteria. Age over 50 years old, long T2DM duration, poorer baseline metabolic control, and previous insulin treatment are markers of poorer response.