RT-135
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Prognostic value of QT dispersion with respect to Bayes theory of probability
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Andrzej Dabrowski, Ryszard Piotrowicz, El˙zbieta Kramarz.
Department of Noninvasive Cardiology, Central Clinical Hospital MMA, Warsaw, Poland
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Survivors of an acute myocardial infarction are at increased risk for
cardiac death. Most of these deaths are sudden, and are associated with sustained ventricular tachycardia and
ventricular fibrillation. Several authors have reported the predictive value of prolonged dispersion of QT interval
for mortality and malignant ventricular arrhythmias1-4, however, the findings of others have been
contraindicatory5. Because of a high overlapping in the values of QT dispersion observed between patients with
and without susceptibility to arrhythmic events, the positive predictive value of this variable in predicting
arrhythmic events is relatively low.
The aim of this study was to test the hypothesis that selection of postinfarction patients with a higher pretest
likelihood of arrhythmic events may be used to improve the positive predictive accuracy of QT dispersion
calculated for risk stratification after myocardial infarction.
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