title: A quantitative evaluation of ST-segment changes on the 18-lead electrocardiogram during acute coronary occlusions.
abstract: This study determined quantitative ST segment changes on the 18-lead electrocardiogram (ECG) during occlusions in each of the coronary arteries.
  
  
  METHODS
  Continuous 18-lead ECGs, including standard 12 leads, posterior (V7-9), and right ventricular (RV) leads (V3-5R) were recorded for 155 subjects undergoing percutaneous coronary occlusions, the maximum intervention.
  
  
  RESULTS
  During 58 left anterior descending (LAD) coronary occlusions, the maximum ST elevation and depression were in V3 (4.2 mm) and III (-0.9 mm), respectively. During 44 right coronary artery (RCA) occlusions, the maximum ST elevation and depression were in III (2.2 mm) and aVL (-1.4 mm), respectively. During 53 left circumflex (LCX) occlusions, the maximum ST elevation and depression were in V7 (0.8 mm) and V2 (-1.6 mm), respectively.
  
  
  CONCLUSIONS
  ST elevation often occurred in the anteroapical (V1-V6), lateral (I, aVL), and RV lead V(3R) during LAD occlusions; in the inferior, RV, and posterior leads during RCA occlusions; and in the posterior, inferior, and apical leads (V5-V6) during LCX occlusions.
authors.affiliation: College of Nursing, University of Arizona, Tucson 85721-0203, USA. shufen@nursing.arizona.edu
authors.forename: Shu-Fen
authors.initials: SF
authors.lastname: Wung
authors.forename: David Y
authors.initials: DY
authors.lastname: Kahn
mesh_terms: D000208:Acute Disease; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000150:complications* / Q000175:diagnosis*; D003327:Coronary Disease / Q000150:complications* / Q000175:diagnosis*; D003936:Diagnosis, Computer-Assisted / Q000379:methods; D003937:Diagnosis, Differential; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000150:complications* / Q000175:diagnosis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity