Abnormal heart rate turbulence onset predicted transplant-free survival in idiopathic dilated cardiomyopathy, while LVEF predicted major arrhythmic events (RR 2.2; 95% CI 1.5-3.2 per 10% decrease).
Cohort (n=242)
Blinded
Does abnormal heart rate turbulence predict mortality, heart transplant, or major arrhythmic events in patients with idiopathic dilated cardiomyopathy?
In patients with idiopathic dilated cardiomyopathy, abnormal heart rate turbulence onset predicts mortality or need for heart transplant, but not major arrhythmic events.
Effect estimate: RR 2.2 (95% CI 1.5-3.2)
UNLABELLED: Heart Rate Turbulence in Dilated Cardiomyopathy. INTRODUCTION: The aim of this study was to investigate the prognostic significance of heart rate turbulence (HRT) characterized by HRT onset and slope after ventricular premature beats in patients with idiopathic dilated cardiomyopathy (IDC). METHODS AND RESULTS: Blinded HRT analysis was performed in 242 patients with IDC who were enrolled in the Marburg Cardiomyopathy database between 1992 and 2000. During 41 +/- 23 months of follow-up, 54 patients (22%) died or underwent heart transplant. On Cox univariate regression analysis, abnormal HRT onset, HRT slope, HRT onset combined with HRT slope, left ventricular (LV) ejection fraction, LV size, and New York Heart Association (NYHA) functional class III showed a significant association with total mortality or the need for heart transplant. On multivariate analysis, abnormal HRT onset identified patients without transplant-free survival, as did LV size and NYHA class III heart failure. Major arrhythmic events were observed in 42 patients (17%) during follow-up. On univariate analysis, abnormal HRT onset, HRT onset combined with HRT slope, male sex, NYHA class III, LV ejection fraction, and LV size were associated with a higher incidence of major arrhythmic events. On multivariate analysis, only LV ejection fraction remained as a significant arrhythmia risk predictor, with a relative risk of 2.2 per 10% decrease in ejection fraction (95% confidence interval 1.5-3.2). CONCLUSION: In this selected patient population with IDC, HRT onset is a significant predictor of transplant-free survival, as are LV size and NYHA class. For arrhythmia risk stratification, however, only LV ejection fraction remained a significant risk predictor on multivariate analysis.
Grimm et al. (Tue,) conducted a cohort in Idiopathic dilated cardiomyopathy (n=242). Heart rate turbulence (HRT) was evaluated on Total mortality or the need for heart transplant, and major arrhythmic events (RR 2.2, 95% CI 1.5-3.2). Abnormal heart rate turbulence onset predicted transplant-free survival in idiopathic dilated cardiomyopathy, while LVEF predicted major arrhythmic events (RR 2.2; 95% CI 1.5-3.2 per 10% decrease).