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To evaluate the evolution of vitamin D levels (25OHD) in patients submitted to bariatric surgery. Retrospective study, conducted with patients submitted to bariatric surgery between 2013 and 2018, in a city in the Northeast of Brazil. The variations of 25OHD, weight, body mass index (BMI), and total lymphocyte count were analyzed and compared for preoperative and postoperative periods of 6 and 12 months. Vitamin D levels below 30ng/mL were considered insufficient. Analysis of variance (ANOVA) was used for repeated measures, followed by Bonferroni post hoc test. To identify variables related to vitamin D, Pearson’s correlation test and linear regression analysis were used. A significance level of 5% (p

To trace the clinical profile of fistula cases after sleeve gastrectomy (SG) and evaluate the efficacy and safety of endoscopic treatments and the admission costs of these patients. This is a retrospective study of patients who developed gastric fistulas after SG. All patients were submitted to surgical and/or endoscopic interventions (self-expandable stent, septotomy, and balloon dilation). The main studied variables were need for reoperation, number of endoscopic procedures, endoscopic complications, time until fistula diagnosis, fistula location, time until resolution, length of hospital stay, and health costs. The sample was mainly female (76.2%) with a mean age of 39.5 years and a BMI of 39.6 kg/m2. In 90.5% of cases, the fistula occurred in the topography of the His angle. Thirteen patients required surgical intervention. Of the patients who underwent endoscopic interventions, it was necessary to place more than one self-expandable stent of a maximum duration of 4 weeks. Six patients underwent more than two sessions of septotomy. There was one case of bleeding after septotomy. Dilatation was required in 71.4% of patients and an average of two sessions (1–5) per patient. The diagnosis of fistula occurred 14.4 days after surgery. The average time to resolve fistulas was 50.6 days. The average hospital stay was 75.8 days. The total cost of hospitalization was on average US$ 75,180.00. The surgical and endoscopic treatment of gastric fistulas after SG was safe and effective. There was a very low rate of complications. The time of onset of fistulas was not decisive for patient improvement.