Short-term variability of repolarization predicts ventricular tachycardia and sudden cardiac death in patients with structural heart disease: A comparison with QT variability index

BackgroundMonitoring arrhythmic risk may improve management of patients with implantable cardioverter-defibrillators (ICD) and prevent ICD shocks. Changes in repolarization duration between subsequent beats quantified as short-term variability (STV) is associated with ventricular arrhythmias in several animal models.ObjectiveWe evaluated STV of QT from right ventricular intracardiac ICD electrograms in patients with structural heart disease and compared its predictive value with the QT variability index (QTVI).MethodsIn 233 patients, STV over 60 beats for QT and RR intervals and their ratio was calculated (STVQT, STVRR, STVRatio, respectively). QTVI was derived from mean and SD of QT and heart rate. Follow-up duration was 26 ± 15 months. Predictive value was determined for sudden arrhythmic death (SAD) defined as sudden cardiac death or fast ventricular tachycardia/fibrillation [CL < 240 ms].ResultsIn univariate analysis, STVRatio, but not STVQT or STVRR, was predictive of SAD. Hazard ratios for highest quartile STVRatio and QTVI were comparable (STVRatio: 1.9, 95% confidence interval [CI] 1.1 to 3.3, P = .038, QTVI: 2.2, 95% CI 1.2 to 3.8, P = .010). In a multivariate model, highest quartile STVRatio was predictive of SAD after adjustment for New York Heart Association class, history of ischemia, ICD indication, and use of class I antiarrhythmics (hazard ratio 1.8, 95% CI 1.0 to 3.4, P < .050). A combined criterion of highest quartile for both STVRatio and QTVI identified patients at highest risk (hazard ratio 2.4, 95% CI 1.3 to 4.3, P = .005, positive predictive value 38%, negative predictive value 82%).ConclusionSTVRatio from ICD electrograms is predictive of SAD. Predictive value is similar for order-based STVRatio and distribution-based QTVI, but the combination of both parameters can further improve results.