Circulation Journal
Online ISSN : 1347-4820
Print ISSN : 1346-9843
ISSN-L : 1346-9843
Arrhythmia/Electrophysiology
Association of Heart Rate Variability With Arrhythmic Events in Patients With Arrhythmogenic Right Ventricular Cardiomyopathy/Dysplasia
Irma BattipagliaGiancarla ScaloneAndrea MacchioneGaetano PinnacchioMarianna LauritoMaria MiloGemma PelargonioGianluigi BencardinoFulvio BellocciMaurizio PieroniGaetano A. LanzaFilippo Crea
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2012 Volume 76 Issue 3 Pages 618-623

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Abstract

Background: Arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) is associated with an increased risk of sudden cardiac death (SCD). Risk stratification of ARVC/D patients, however, remains an unresolved issue. In this study we investigated whether heart rate variability (HRV) can be helpful in identifying ARVC/D patients with increased risk of arrhythmic events. Methods and Results: We studied 30 consecutive patients (17 males; 45.4±18 years) with ARVC/D, diagnosed according to guideline criteria; 15 patients (50%) had received an implantable cardioverter defibrillator (ICD) for primary SCD prevention. HRV was assessed on 24-h ECG Holter monitoring. The primary endpoint was the occurrence of major arrhythmic events (SCD, sustained ventricular tachycardia (VT), ICD therapy for sustained VT or ventricular fibrillation (VF)). During the follow-up period (19±7 months), no deaths occurred, but 5 patients (17%) experienced arrhythmic events (4 VTs and 1 VF, all in the ICD group). All HRV parameters were significantly lower in patients with, compared with those without, arrhythmic events. Low-frequency amplitude was the most significant HRV variable associated with arrhythmic events in univariate Cox regression analysis (P=0.017), and was the only significant predictor of arrhythmic events in multivariable regression analysis (hazard ratio 0.88, P=0.047), together with unexplained syncope (hazard ratio 16.1, P=0.039). Conclusions: Our data show that among ARVC/D patients HRV analysis might be helpful in identifying those with increased risk of major arrhythmic events. (Circ J 2012; 76: 618-623)

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© 2012 THE JAPANESE CIRCULATION SOCIETY
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