Papel do acometimento da artéria coronária circunflexa no infarto do miocárdio sem onda Q / The Role of Left Circunflex Coronary Artery Obstruction in Non-Q Ware Acute Myocardial Infarction

RESUMO

PURPOSE--To determine the patency and incidence rates of left circumflex coronary artery (LCX) as the infarct related artery (IRA) in Q-wave and non-Q wave acute myocardial infarction (AMI). METHODS--Two-hundreds and twenty one patients (172 men) with AMI were stratified in Q and non-Q waves groups. All patients were submitted to cinecoronary angiography 72 hours after the beginning of symptoms and the IRA and its patency were evaluated. RESULTS--In non-Q wave AMI, the LCX was considered to be the IRA in 35 of the patients. In Q wave AMI, this incidence was 8 (p < 0.001). Occlusion of LCX was seen in all non-Q wave AMI patients when it was the IRA. CONCLUSION--The incidence of LCX as IRA was significantly higher in non-Q wave AMI patients. This group did not have the previously expected greater patency rates, what could result in different clinical and evolutive characteristics.

ABSTRACT

Purpose - To determine the patency and incidencerates of left circunflex coronary artery (LCX) as the infarct related artery (IRA) in Q-wave and non-Q wave acute myocardial infarction (AMI). Methods - Two-hundreds and twenty one patients (172 men) with AMI were stratified in Q and non-Q waves groups. All patients were submitted to cinecoronary angiography 72 hours after the beginning of symptoms and the IRA and its patency were evaluated. Results -In non-Q wave AMI, the LCX was considered to be the IRA in 35% of the patients. In Q wave AMI, this incidence was 8% (p<0.001). Occlusion of LCX was seen in all non-Q wave AMI patients when it was the IRA. Conclusion - The incidence of LCX as IRA was significantly higher in non-Q wave AMI patients. This group did not have the previously expected greater patency rates, what could result in different clinical and evolutive characteristics