title: The Relationship between P & QT Dispersions and Presence & Severity of Stable Coronary Artery Disease.
abstract: OBJECTIVE
  The study aimed to evaluate the correlation between electrocardiographic (ECG) parameters and presence and extent of coronary artery disease (CAD) to indicate the usefulness of these parameters as predictors of severity in patients with stable CAD.
  
  
  METHODS
  Two hundred fifty patients, without a history of any cardiovascular event were included in the study. The ECG parameters were measured manually by a cardiologist before coronary angiography. The patients were allocated into five groups: those with normal coronary arteries (Group 1), non-critical coronary lesions (Group 2), one, two and three vessel disease (Group 3, Group 4 and Group 5, respectively.
  
  
  RESULTS
  Group 1 had the lowest P wave dispersion (PWD) and P wave (Pmax), QT interval (QTmax), QT dispersion (QTd), corrected QT dispersion (QTcd) and QT dispersion ratio (QTdR), while the patients in group 5 had the highest values of these parameters. Gensini score and QTmax, QTd, QTcmax, QTcd, QTdR, Pmax, and PWD were positively correlated. QTdR was the best ECG parameter to differentiate group 1 and 2 from groups with significant stenosis (groups 3, 4, and 5) (area under curve [AUC] 0.846). QTdR was the best ECG parameter to detect coronary arterial narrowing lesser than 50% and greater than 50%, respectively (AUC 0.858).
  
  
  CONCLUSIONS
  Presence and severity of CAD can be determined by using ECG in patients with stable CAD and normal left ventricular function.
authors.affiliation: Department of Cardiology, Erzurum Region Training and Research Hospital, Erzurum, Turkey.
authors.forename: Bingül Dilekci
authors.initials: BD
authors.lastname: Şahin
authors.affiliation: Department of Cardiology, Erzurum Region Training and Research Hospital, Erzurum, Turkey.
authors.forename: Erkan
authors.initials: E
authors.lastname: Yıldırım
authors.affiliation: Department of Cardiology, Erzurum Region Training and Research Hospital, Erzurum, Turkey.
authors.forename: Emrah
authors.initials: E
authors.lastname: Ipek
authors.affiliation: Department of Internal Medicine, Cerrahpaşa Faculty of Medicine, Istanbul University, Istanbul, Turkey.
authors.forename: Mahir
authors.initials: M
authors.lastname: Cengiz
authors.affiliation: Department of Cardiology, Erzurum Region Training and Research Hospital, Erzurum, Turkey.
authors.forename: Kursat
authors.initials: K
authors.lastname: Aslan
authors.affiliation: Department of Cardiology, Istanbul Siyami Ersek Training and Research Hospital, Istanbul, Turkey.
authors.forename: Esra
authors.initials: E
authors.lastname: Poyraz
authors.affiliation: Department of Cardiology, Erzurum Region Training and Research Hospital, Erzurum, Turkey.
authors.forename: Selami
authors.initials: S
authors.lastname: Demirelli
authors.affiliation: Department of Cardiology, Erzurum Region Training and Research Hospital, Erzurum, Turkey.
authors.forename: Murat
authors.initials: M
authors.lastname: Bayantemur
authors.affiliation: Department of Cardiology, Erzurum Region Training and Research Hospital, Erzurum, Turkey.
authors.forename: Emrah
authors.initials: E
authors.lastname: Ermis
authors.affiliation: Department of Cardiology, Istanbul Bilim University, Istanbul, Turkey.
authors.forename: Cavlan
authors.initials: C
authors.lastname: Ciftci
keywords: Coronary artery disease; Electrocardiography; P wave & QT interval