[Role of circumflex coronary artery involvement in non-Q wave myocardial infarction].
OBJECTIVE
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.


CONCLUSIONS
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.
Kalil Filho
R
R
Instituto do Coração do Hospital das Clínicas-FMUSP.
Soares
P R
PR
Rochitte
C E
CE
de Albuquerque
C P
CP
Tranchesi Júnior
B
B
D016009:Chi-Square Distribution; D017023:Coronary Angiography; D003327:Coronary Disease / Q000150:complications* / Q000175:diagnosis*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D009203:Myocardial Infarction / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D012189:Retrospective Studies
Papel do acometimento da artéria coronária circunflexa no infarto do miocárdio sem onda Q.