Objectives: to determine the effectiveness of bariatric surgery to reduce the risk of cardiovascular events such as coronary heart disease, stroke, cardiovascular mortality, and total mortality in morbidly obese patients, compared with a non-surgical treatment and no intervention control group. Methods: a systematic review was carried out with cohort-type studies that evaluated, with a minimum follow-up of one year, morbidly obese adults who had undergone bariatric surgery compared to a control group of non-surgical treatment and without intervention in relation to the cardiovascular events such as coronary heart disease, stroke, cardiovascular mortality, and total mortality in morbidly obese patients. Results: 14 studies were selected that met our inclusion criteria. 44,912 patients who underwent bariatric surgery and 208,347 non-surgical controls were included. The high heterogeneity o...