Assessing bleeding risk in bariatric surgeries: a retrospective analysis study.

OBJECTIVE: To determine the factors that influence bleeding during the course of bariatric surgeries. BACKGROUND: Bariatric surgery is safe with a low percentage of complications compared with other abdominal surgeries. Bleeding is one of the most common complications in surgery for obesity that has the risk of being catastrophic. METHODS: The study includes 8544 cases that underwent bariatric surgery from January 2013 to March 2016 retrospectively, in four private institutions. Multiple demographic data were collected: patient characteristics, diseases, medications, surgery type, operative technique, devices, surgeon's skill, and volume. RESULTS: Bleeding was the most frequent complication that occurred in 122 (1.3%) patients. The Gastric bypass had the highest rate of bleeding (3. 05%) of which, 20% were intraoperative bleeding and 80% postoperatively (intra-abdominal in 75%, and intra-luminal in 5%). Simultaneous surgeries, revisional surgeries, stratification of body mass index, stapler line reinforcement, and hospital volume did not affect bleeding occurrence. The determining factors for bleeding were hypertension, chronic lung disease, age >45 years, arrhythmia, and surgeon's skills. CONCLUSION: Bleeding after bariatric surgery have a low occurrence. The factors that influence the occurrence of perioperative bleeding in bariatric surgery are: hypertension, chronic lung disease, age >45 years, arrhythmia, and surgeon's skills.