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Ventricular repolarization dynamicity provides independent prognostic information toward major arrhythmic events in

Massimo Iacoviello1, Cinzia Forleo, Pietro Guida

  • 1Institute of Cardiology, University of Bari, Bari, Italy. massimo.iacoviello@cardio.uniba.it

Journal of the American College of Cardiology
|July 17, 2007
PubMed

Insights

Ventricular repolarization dynamicity, measured by QTe-slope, independently predicts major arrhythmic events in dilated cardiomyopathy (DCM) patients, improving risk stratification. This finding enhances the prediction of sudden cardiac death in DCM.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Heart Failure Research

Background:

  • Arrhythmic risk stratification in idiopathic dilated cardiomyopathy (DCM) remains challenging.
  • Traditional markers like QT interval and QT dispersion have limited predictive value for arrhythmias in DCM.
  • Novel markers are needed to improve risk assessment in DCM patients.

Purpose of the Study:

  • To determine if ventricular repolarization dynamicity predicts major arrhythmic events in patients with idiopathic DCM.
  • To assess the independent predictive value of repolarization dynamicity beyond established markers.
  • To enhance arrhythmic risk stratification in DCM.

Main Methods:

  • Evaluated 179 DCM patients using ECG, echocardiography, and 24-h Holter monitoring.
  • Assessed QRS duration, corrected QT interval, QT dispersion, left ventricular ejection fraction (LVEF), and left ventricular end-diastolic diameter.
  • Measured ventricular repolarization dynamicity via QTe-slope and mean corrected QT end, alongside nonsustained ventricular tachycardia (NSVT) and heart rate variability.

Main Results:

  • During a 39-month follow-up, 9 patients died suddenly and 15 experienced ventricular tachycardia (VT)/ventricular fibrillation (VF).
  • Multivariate analysis identified LVEF, NSVT, and QTe-slope as significant predictors of arrhythmic events (p=0.047, p=0.022, p=0.034 respectively).
  • A subgroup with low LVEF and either NSVT or steeper QTe-slope exhibited the highest arrhythmic risk.

Conclusions:

  • Ventricular repolarization dynamicity (QTe-slope) is an independent predictor of major arrhythmic events in DCM patients.
  • Incorporating QT dynamicity improves the accuracy of arrhythmic risk stratification in DCM.
  • This finding offers a novel approach to identify high-risk DCM patients for closer monitoring and intervention.
Abstract

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