Revascularizaçäo do miocárdio com endarterectomia da artéria coronária: estratificaçäo dos fatores de risco de mortalidade imediata / Myocardial revascularization with coronary endarterectomy: stratification of risk factors for early mortality

RESUMO

OBJECTIVE: To determine the risk factors for mortality related to myocardial revascularization when performed in association with coronary endarterectomy. METHODS: We assessed retrospectively 353 patients who underwent 373 coronary endarterectomies between January '89 and November '98, representing 3.73 percent of the myocardial revascularizations in this period of time. The arteries involved were as follows right coronary artery in 218 patients (58.45 percent); left anterior descending in 102 patients (27.35 percent); circumflex artery in 39 patients (10.46 percent); and diagonal artery in 14 patients (3.74 percent). We used 320 (85.79 percent) venous grafts and 53 (14.21 percent) arterial grafts. RESULTS: In-hospital mortality among our patients was 9.3 percent as compared with 5.7 percent in patients with myocardial revascularizations without endarterectomy (p=0.003). Cause of death was related to acute myocardial infarction in 18 (54.55 percent) patients. The most significant risk factors for mortality identified were as follows diabetes mellitus (p=0.001; odds ratio =7.168), left main disease (<0.001; 9.283), female sex (0.01; 3.111), acute myocardial infarction (0.02; 3.546), ejection fraction <35 percent (<0.001; 5.89), and previous myocardial revascularization (<0.001; 4.295). CONCLUSION: Coronary endarterectomy is related to higher mortality, and the risk factors involved are important elements of a poor outcome: