Journal Article

Repolarization variability in the risk stratification of MADIT II patients

Jean-Philippe Couderc, Wojciech Zareba, Scott McNitt, Pierre Maison-Blanche and Arthur J. Moss

in EP Europace

Published on behalf of European Heart Rhythm Association of the European Society of Cardiology (ESC)

Volume 9, issue 9, pages 717-723
Published in print September 2007 | ISSN: 1099-5129
Published online July 2007 | e-ISSN: 1532-2092 | DOI: http://dx.doi.org/10.1093/europace/eum131
Repolarization variability in the risk stratification of MADIT II patients

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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.

Keywords: T-wave variability; MADIT II; Risk stratification

Journal Article.  4637 words.  Illustrated.

Subjects: Cardiovascular Medicine

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