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Hiperobesity v/s morbid obesity: a comparative studyIntroduction: Bariatric surgery is effective and safe in treating obese patients with BMI > 40, however, higher preoperative weight could increases morbidity and mortality. Aim: To describe and compare the perioperative and mid term outcomes between hiperobese and morbidly obese patients submitted to gastric bypass. Material and Method: A prospective study of hiperobese patients submitted to gastric bypass over the past 10 years. We analyzed clinical characteristics, perioperative morbimortality and resolution of comorbidities. The results were compared with a group of morbidly obese patients matched by age and sex. Results: 146 hiperobese were operated and compared with 165 morbidly obese patients. 66.8% were female and the average age of the total group was 39.9 ± 12.4 years, with no signifi cant differences between groups by sex and age. The average BMI was 53 and 44.4 respectively. 21.5% had diabetes mellitus 2, 39.5% hypertension, 31% dislipidemia and 8.4% osteoarthritis, with no signifi cant differences between groups except for a higher prevalence of dyslipidemia in the morbidly obeses (p = 0.001). 10.4% had surgical complications during the postoperative period, with no differences between both groups (p = 0.24). One year later all patients had a signifi cant decrease in weight, however, hiperobeses showed a more pronounced decrease (p = 0.001). The fasting glucose, cholesterol and triglycerides levels also showed a signifi cant decrease without reaching differences between the groups. Conclusions: The gastric bypass is effective in achieving weight loss and resolution of comorbidities in morbidly obese as well as hiperobese patients, with no signifi cant differences in surgical complications and mortality.