title: A planar QRS-T angle >90 degrees is associated with multivessel coronary artery disease in patients undergoing coronary angiography.
abstract: BACKGROUND
  The aim of the study was to investigate the severity of coronary artery disease (CAD) in patients who had a planar QRS-T angle >90 degrees versus <or=90 degrees.
  
  
  METHODS
  Coronary angiography was performed in 1,229 consecutive patients. Obstructive CAD was diagnosed if there was >50% obstruction of >or=1 major coronary artery. All QRS-T angle measurements were made from a 12-lead electrocardiogram by 2 authors who agreed on the measurement and who were blinded to the coronary angiographic findings. A QRS-T angle >90 degrees was considered abnormal.
  
  
  RESULTS
  Obstructive CAD of 2 or 3 vessels was present in 309 of 495 patients (62%) with a planar QRS-T angle >90 degrees and in 250 of 734 patients (34%) with a planar QRS-T angle <or=90 degrees . (p<0.0001). Stepwise logistic regression analyses showed that significant independent risk factors for 2- or 3-vessel CAD were age (odds ratio =1.05), male gender (odds ratio =1.8), black race (odds ratio =0.34), unstable angina (odds ratio =0.16), positive stress test (odds ratio =3.0), hypertension (odds ratio =3.0), dyslipidemia (odds ratio =2.9), QRS-T angle (odds ratio =7.2), left bundle branch block (odds ratio =2.9), right bundle branch block (odds ratio =0.17), smoking (odds ratio =9.7), and body mass index >or=30 kg/m2 (odds ratio =1.5).
  
  
  CONCLUSIONS
  The prevalence of 2- or 3-vessel obstructive CAD was significantly higher in patients with a planar QRS-T angle >90 degrees than in patients with a planar QRS-T angle <or=90 degrees (p<0.0001).
authors: Department of Medicine, Cardiology Division, New York Medical College, Valhalla, NY 10595, USA.
authors: Chandrasekar
authors: C
authors: Palaniswamy
authors: Tarunjit
authors: T
authors: Singh
authors: Wilbert S
authors: WS
authors: Aronow
authors: Chul
authors: C
authors: Ahn
authors: Kumar
authors: K
authors: Kalapatapu
authors: Melvin B
authors: MB
authors: Weiss
authors: Anthony L
authors: AL
authors: Pucillo
authors: Craig E
authors: CE
authors: Monsen
mesh_terms: D000368:Aged; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D003331:Coronary Vessels / Q000473:pathology; D004562:Electrocardiography; D005260:Female; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000150:complications; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012307:Risk Factors