2| MATERIALS AND METHODS
Between January 2012 and December 2016, a retrospective research identified 1405 patients submitted to isolated coronary artery bypass grafting (CABG) at the Hospital Santa Cruz. Of these patients, 170 underwent assessment of myocardial viability with myocardial perfusion scintigraphy before surgery. Patients with emergency surgery (2) or previous cardiac surgery (6) were excluded. These exclusion criteria were selected a priori . Therefore, the study population consisted of 162 patients operated during a 5-year interval.