Disfunção Sistólica do Ventrículo Esquerdo e Prognóstico após Cirurgia de Revascularização do Miocárdio Left Ventricular Systolic Dysfunction and Prognosis after Coronary Artery Bypass Graft Surgery

Background: Coronary artery bypass graft (CABG) surgery prolongs the survival of patients with coronary artery disease (CAD) and left ventricular dysfunction (LVD). Objective: To verify whether CABG can match the survival times of CAD patients with and without LVD. Methods: 259 patients who survived CAGB performed between October 1, 2001 and January 31, 2004 were followed up for three years, with LVD characterized by a left ventricle ejection fraction of ≤40%. Two groups of patients were established, based on the presence (G1; n=45) or absence (G2; n=214) of LVD. Results: G1 patients presented more acute coronary syndromes before CABG (64.4% vs 40.2%; p=0.005), congestive heart failure (17.8% vs 1.9%; p<0.0001), previous history of acute myocardial infarction (80% vs 60.3%; p=0.016), and chronic obstructive pulmonary disease (11.1% vs 2.3%; p=0.016) than G2. The threeyear cumulative survival rate was significantly lower in G1 than in G2 (88.8±4.7% vs 95.7±1.3%, respectively; p=0.05). However, LVD was not an independent factor for shorter survival times during the follow-up period (p=0.119). Conclusion: this study suggests that CABG is unable to match the survival of patients with CAD and LVD to the survival of patients with CAD without LVD.