Open AccessQT dispersion ratio in patients with unstable angina pectoris (A new risk factor?)
Author(s) -
Cin V. G.,
Celik M.,
Ulucan S.
Publication year - 1997
Publication title -
clinical cardiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.263
H-Index - 72
eISSN - 1932-8737
pISSN - 0160-9289
DOI - 10.1002/clc.4960200605
Subject(s) - medicine , risk factor , cardiology , angina , unstable angina , dispersion (optics) , coronary heart disease , myocardial infarction , physics , optics
Background : QT dispersion has been shown to be associated with fatal arrhythmias and sudden death in coronary artery disease. A recent study indicated that marked QT dispersion in electrocardiograms (ECGs) obtained during acute ischemia demonstrated a significant correlation with ventricular fibrillation. Hypothesis : This study investigated the ECG parameters for repolarization (QT dispersion, corrected QT, corrected QT dispersion, and QT dispersion ratio) and their interrelation with acute ischemia. Methods : QT parameters as well as a newly developed repolarization index, QT dispersion ratio l(QT dispersion/RR interval) × 100] were calculated digitally during rest and ischemia in 32 patients with coronary artery disease (rest angina, Braunwald class III). Results were correlated with clinical consequences, mainly arrhythmias, within a follow‐up period of 5±2days. Results : While most patients had an increase in all four parameters, only the QT dispersion ratio showed a significant difference when correlated with ventricular arrhythmias (p < 0.001, F ratio = 38). Conclusion : QT dispersion ratio appears to be a new and promising parameter in predicting ventricular arrhythmias in patients with acute ischemia.