QT dispersion, daily variations, QT interval adaptation and late potentials as risk markers for ventricular tachycardia

Aims The aim of the study was to determine the value and correlation between QT dispersion, daily variations in the QT interval and late potentials as risk markers for ventricular tachycardia. Methods and results QT dispersion was defined as the difference between the longest and the shortest QT int...

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Bibliographic Details
Published in:European heart journal 1997-08, Vol.18 (8), p.1343-1349
Main Authors: Puljevic, D., Smalcelj, A., Durakovic, Z., Goldner, V.
Format: Article
Language:English
Subjects:
Action Potentials
adaptation
arrhythmia
Biological and medical sciences
Cardiac dysrhythmias
Cardiology. Vascular system
Electrocardiography
Heart
Heart Conduction System - physiopathology
Heart Rate
Humans
late potentials
Medical sciences
Multivariate Analysis
Prognosis
QT dispersion
Risk Factors
Sensitivity and Specificity
Tachycardia, Ventricular - diagnostic imaging
Tachycardia, Ventricular - physiopathology
Ultrasonography
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Summary:Aims The aim of the study was to determine the value and correlation between QT dispersion, daily variations in the QT interval and late potentials as risk markers for ventricular tachycardia. Methods and results QT dispersion was defined as the difference between the longest and the shortest QT interval in 12 electrocardiographic leads, QTc variability as the difference between the maximal and minimal QTc interval during 24-h Holter monitoring and QT interval adaptation as the regression line between heart rate and the uncor-rected QT interval. One hundred and forty-five patients, 3 months after myocardial infarction were included in the study. QT dispersion significantly increased with the severity of arrhythmia (modified Lown's classification; P0·05). QT interval adaptation did not discriminate between patients with ventricular tachycardia from those in other groups. Late potentials were associated with ventricular tachycardia with a sensitivity of 50% and a specificity of 90·3%. Conclusion Large QT dispersion and late potentials were risk markers for ventricular tachycardia, but there was no correlation between QT dispersion, daily variations in the QT interval and late potentials in patients 3 months after myocardial infarction.
ISSN:0195-668X
1522-9645
DOI:10.1093/oxfordjournals.eurheartj.a015448