title: [Role of circumflex coronary artery involvement in non-Q wave myocardial infarction].
abstract: 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.
authors.affiliation: Instituto do Coração do Hospital das Clínicas-FMUSP.
authors.forename: R
authors.initials: R
authors.lastname: Kalil Filho
authors.forename: P R
authors.initials: PR
authors.lastname: Soares
authors.forename: C E
authors.initials: CE
authors.lastname: Rochitte
authors.forename: C P
authors.initials: CP
authors.lastname: de Albuquerque
authors.forename: B
authors.initials: B
authors.lastname: Tranchesi Júnior
mesh_terms: 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
vernacular_title: Papel do acometimento da artéria coronária circunflexa no infarto do miocárdio sem onda Q.