RT-175
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Dispersion of QT interval in
ectopic ventricular beats. A new approach to assessment of ventricular inhomogeneity
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Andrzej Dabrowski, Ryszard
Piotrowicz, Elzbieta Kramarz.
Department of Noninvasive Cardiology, Central Clinical Hospital MMA, Warsaw,
Poland
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Abstract
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Background. QT interval dispersion in
ectopic ventricular beats (QTdV) has not been investigated with respect to its methodical
problems and clinical significance. The aim of this study was to analyse a relation
between the magnitude of QTdV and varied clinical and electrocardiographic parameters.
Methods. In the group of 300 patients with ectopic ventricular beats
(EVBs), the QTdV was calculated as the difference between maximum and minimum QT interval
of EVBs.
Results. Univariate analysis indicated that cardiac disease,
ventricular tachycardia, bundle branch block, ejection fraction < 40%, QRS complex
duration of EVBs > 150 ms, prematurity index of EVBs < 1, and right bundle branch
block pattern of EVBs were associated with higher values of QTdV. Stepwise discriminant
analysis revealed that ventricular tachycardia was the best predictor of high values of
QTdV.
Conclusion. Measurement of QTdV may be a useful noninvasive method
for detecting the inhomogeneity of ventricular recovery time.
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Key Words
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RR interval, repolariozation, heterogeneity,
variability
QT interval dispersion, ectopic ventricular beats, inhomogeneity of ventricular recovery
time, 12-lead ECG, ECG leads configuration, arrhythmogenesis, OA
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