Everybody agree that the pre-operative nutritional condition of large surgeries patients, mainly those envolving intestinal tract, influence their clinical evolution. Objective: Know the influence of pre-operative nutritional status in the morbimortality of heart surgery patients. Methods: This is an observational, descriptive and prospective study, based on a peri-operative monitoring heart surgery patients in a hospital of Aracaju-SE city. The data collect was divided in three steps: 1 step - pre-operative variables collect; 2 step - post-operative data collect; 3 step - The post-operative monitoring extended before hospital check out by a weekly phone call until 30 days after. Results: The sample was formed by 173 individuals of both sexes, with average age (57,4±10,5 years). A significant association was shown between body mass index (p=0,02), the waist circumference (p=0,001), the arm circumference fitness percentage fitness (p=0,02) and post-operative complications occurrence (p=0,01). Conclusion: The malnutrition status influence the increase of post-operative complications occurrence, strongly associated with noninfectious complications incidence in this patients group.