Association between Atrial Fibrillatory Rate and Heart Rate Variability in Patients with Atrial Fibrillation and Congestive Heart Failure
Article first published online: 22 NOV 2012
©2012, Wiley Periodicals, Inc.
Annals of Noninvasive Electrocardiology
Volume 18, Issue 1, pages 41–50, January 2013
How to Cite
Corino, V. D. A., Cygankiewicz, I., Mainardi, L. T., Stridh, M., Vasquez, R., Bayes de Luna, A., Holmqvist, F., Zareba, W. and Platonov, P. G. (2013), Association between Atrial Fibrillatory Rate and Heart Rate Variability in Patients with Atrial Fibrillation and Congestive Heart Failure. Annals of Noninvasive Electrocardiology, 18: 41–50. doi: 10.1111/anec.12019
- Issue published online: 24 JAN 2013
- Article first published online: 22 NOV 2012
- Instituto de Salud Carlos III. Grant Number: G03/078
- Swedish National Healthcare System
- Lund University Hospital
- Swedish Heart-Lung Foundation
- atrial fibrillation;
- time domain parameters;
- approximate entropy;
- congestive heart failure
Even if atrial fibrillatory rate (AFR) has been related to clinical outcome in patients with atrial fibrillation (AF), its relation with ventricular response has not been deeply studied. The aim of this study was to investigate the relation between AFR and RR series variability in patients with AF.
Twenty-minute electrocardiograms in orthogonal leads were processed to extract AFR, using spatiotemporal QRST cancellation and time frequency analysis, and RR series in 127 patients (age 69 ± 11 years) with congestive heart failure (NYHA II–III) enrolled in the MUSIC study (MUerte Subita en Insufficiencia Cardiaca). Heart rate variability and irregularity were assessed by time domain parameters and entropy-based indices, respectively and their correlation with AFR investigated.
Variability measures seem not to be related to AFR, while irregularity measures do. A significant correlation between AFR and variability parameters of heart rate variability during AF was found only in patients not treated with antiarrhythmics drugs (correlation = 0.56 P < 0.05 for pNN50), while this correlation was lost in patients taking rate- or rhythm-control drugs. A significant positive correlation between AFR and indices of RR irregularity was found, showing that a higher AFR is related to a less organized RR series (correlation = 0.33 P < 0.05 for regularity index for all patients, correlation increased in subgroups of patients treated with the same drug).
These results suggest that a higher AFR is associated with a higher degree of irregularity of ventricular response that is observed regardless of the use of rate-controlling drugs.