Association of left ventricular systolic dysfunction with subsequent cardiac events in coronary artery bypass surgery

Abstract

Background: Systolic heart failure is a prognostic factor for several adverse clinical situations. Proposal: to determine if left ventricular systolic dysfunction is associated with cardiac events after coronary artery bypass surgery. Method: a prospective, longitudinal and observational study with 130 revascularizated patients by coronary artery bypass surgery since the reopening of this activity at 2010 at the Cardiovascular Institut was done. Evolution of patients until 12 months after surgery was determined by external consults and phone calls. Population of the study was divided in two groups: with left ventricular ejection fraction more than 45% (119 patients) and less or equal of 45% (11 patients) for statystical. Chi square and t-student was used to compare qualitatives and quantitatives variables respectively. Probability of survival free of events was determined by Kaplan-Meier test and comparison between groups by Cox-Mantel test. Results: previous myocardial infarction(p=0.02), higher endiastolic and endsytolic diameters(p=0.00) and higher creatinin levels were more frequent in the group of patients with ejection fraction less than 45%. There were differences between both groups according to the incidence of intra-hospital cardiac events (p=0.008) and cardiac mortality(p=0.03). Survival probability without cardiac events at 12 months was less in patients with ejection fraction less than 45%.Conclusion: preoperative left ventricular systolic dysfunction is associated with a higher intra-hospital cardiac mortality.