title: Ischemia detection in women: the diagnostic value of exercise QRS duration changes.
abstract: OBJECTIVE
  To compare the diagnostic accuracy of exercise electrocardiographic (ECG) ST-T changes and QRS duration changes as a means of ischemia detection in a female population.
  
  
  RESULTS
  A total of 101 women from a pool of 318 referred for ECG stress testing underwent standard testing using ST-T criteria with the additional measurement of QRS duration before and at peak exercise using a new computerized optic scanner for precise QRS duration measurement. The diagnostic accuracy of the test was determined using planar thallium stress testing as a "gold standard." For the overall population, the sensitivity of ST-T criteria was 47% with a specificity of 58%. The sensitivity of QRS duration changes was 91% with a specificity of 89%. For Group 1 (age 27-50) the sensitivity of the ST-T criteria was 40% with a specificity of 58%. The sensitivity of the QRS duration changes was 80% with a specificity of 83%. For Group 2 (age 51-83), the sensitivity of the ST-T criteria was 43% with a specificity of 56%. The sensitivity of the QRS duration changes was 94% with a specificity of 90%.
  
  
  CONCLUSIONS
  In our female population exercise, QRS duration changes using our computerized method were better markers of ischemia than standard ST-T criteria.
authors.affiliation: Cardiology Department, Soroka Medical Center, and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Cantor
authors.forename: B
authors.initials: B
authors.lastname: Goldfarb
authors.forename: O
authors.initials: O
authors.lastname: Mai
authors.forename: A
authors.initials: A
authors.lastname: Battler
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000175:diagnosis* / Q000503:physiopathology; D015588:Observer Variation; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D013794:Thallium Radioisotopes
chemical_list: D013794:Thallium Radioisotopes