title: [Electrocardiographic discrimination of infarct-related artery between left circumflex and right coronary artery: comparison of ST elevation between leads II and III].
abstract: OBJECTIVE
  Admission electrocardiography was evaluated to discriminate left circumflex artery (LCX) versus right coronary artery (RCA) as the cause of acute myocardial infarction.
  
  
  METHODS
  Electrocardiographic findings were assessed in patients with RCA (n = 60) and LCX (n = 60) occlusion.
  
  
  RESULTS
  ST segment elevation in the inferior leads or right precordial leads was more common in the RCA group. ST segment depression or negative T wave was more common in leads I, aVL in the RCA group. ST segment elevation was more common in leads V5, V6 in the LCX group. ST segment was elevated in inferior leads in 55 patients in the RCA group and 27 patients in the LCX group. Mean ST level was higher in lead III than in lead II in the RCA group, but not in the LCX group. The ST level was higher in lead III than in lead II in 78% of the RCA group, but only 44% of the LCX group (p < 0.01).
  
  
  CONCLUSIONS
  Comparison of ST levels between leads II and III, and a three-dimensional analysis in 12-lead electrocardiography is useful for discriminating the left circumflex artery from the right coronary artery as the cause of acute myocardial infarction.
authors.affiliation: Division of Internal Medicine, Cardiovascular Center, Saiseikai Kumamoto Hospital, Chikami 5-3-1, Kumamoto, Kumamoto 861-4193.
authors.forename: Ikuo
authors.initials: I
authors.lastname: Misumi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Shono
authors.forename: Koichi
authors.initials: K
authors.lastname: Nakao
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Matsuda
authors.forename: Kenji
authors.initials: K
authors.lastname: Horiuchi
authors.forename: Takashi
authors.initials: T
authors.lastname: Honda
mesh_terms: D000368:Aged; D003331:Coronary Vessels / Q000473:pathology*; D004562:Electrocardiography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*