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Europace Advance Access originally published online on July 17, 2007
Europace 2007 9(9):717-723; doi:10.1093/europace/eum131
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© The European Society of Cardiology 2007. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

IMPLANTABLE CARDIOVERTER-DEFIBRILLATORS

Repolarization variability in the risk stratification of MADIT II patients

Jean-Philippe Couderc1,*, Wojciech Zareba1, Scott McNitt1, Pierre Maison-Blanche2,3 and Arthur J. Moss1

1 Heart Research Follow-up Program, Cardiology, University of Rochester Medical Center, Box 653 Rochester, NY 14642, USA; 2 Hopital Lariboisière, Paris, France; 3 Ela Medical, Paris, France

Aims QT variability has been reported to be associated with ventricular arrhythmias and sudden cardiac death. There is limited data regarding variability in T-wave morphology and its prognostic value. In this study, we present a novel approach for the measurement of T-wave variability (TWV) reflecting changes in T-wave morphology, and we investigate the prognostic significance of Holter-derived TWV in patients with and without ventricular arrhythmias requiring appropriate implantable cardioverter defibrillator (ICD) therapy from the Multicenter Automatic Defibrillator Implantation Trial II (MADIT II).

Methods Study population consisted of 275 ICD patients from MADIT II after excluding patients with intraventricular conduction abnormalities or atrial fibrillation. TWV was measured based on amplitude variance of T-wave amplitude.

Results During 2-year follow-up, 58 (21%) patients had appropriate ICD therapy for ventricular tachycardia or fibrillation. Patients with appropriate ICD therapy had higher levels of TWV measures than those without arrhythmic events. After adjustment for heart rate, ejection fraction, and significant clinical predictors of arrhythmic events, a Cox proportional-hazards regression model revealed that dichotomized TWV values were predictive for ventricular tachyarrhythmias requiring appropriate ICD therapy (hazard ratio, 2.0; 95% CI; 1.2–3.5; P=0.01). On the basis of the comprehensive testing, TWV value >59 µV was found predictive for arrhythmic events in MADIT II population.

Conclusion Our newly designed method for the assessment of repolarization variability in ambulatory Holter recordings detected transient variability of T-wave morphology, which was predictive for ventricular tachyarrhythmias in the MADIT II population.

Key Words: T-wave variability, MADIT II, Risk stratification

* Corresponding author. Tel: +1 585 275 1096; fax: +1 585 273 5283. E-mail address: jean-philippe.couderc{at}heart.rochester.edu

Manuscript submitted 26 February 2007. Accepted after revision 12 June 2007.


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