Abstract
The objective was to determine the characteristics of heart rate variability and ventricular arrhythmias prior to the onset of ventricular tachycardia (VT) in patients with an implantable cardioverter defibrillator (ICD). Sixty-eight beat-to-beat time series from 13 patients with an ICD were analyzed to quantify heart rate variability and ventricular arrhythmias. The episodes of VT were classified in one of two groups depending on whether the sinus rate in the 1 min preceding the VT was greater or less than 90 beats per minute. In a subset of patients, increased heart rate and reduced heart rate variability was often observed up to 20 min prior to the VT. There was a non-significant trend to higher incidence of premature ventricular complexes (PVCs) before VT compared to control recordings. The patterns of the ventricular arrhythmias were highly heterogeneous among different patients and even within the same patient. Analysis of the changes of heart rate and heart rate variability may have predictive value about the onset of VT in selected patients. The patterns of ventricular arrhythmia could not be used to predict onset of VT in this group of patients.
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Abbreviations
- ACE :
-
Angiotensin converting enzyme inhibitor
- ARB:
-
Angiotensin II receptor blocker
- CI :
-
Coupling interval
- FFT :
-
Fast Fourier transform
- FWShannon :
-
Shannon entropy of the symbolic word distribution
- HF :
-
Mean power at the high frequency band (from 0.15 to 0.4 Hz)
- HRV :
-
Heart rate variability
- ICD :
-
Implantable cardioverter defibrillator
- LF :
-
Mean power at the low frequency band (from 0.04 to 0.15 Hz)
- N :
-
Normal heart beat
- NIB :
-
Number of intervening sinus beats (N) between two consecutive V beats
- NN :
-
RR intervals from normal heartbeats
- nu :
-
Normalized units
- NYHA :
-
New York Heart Association
- pNN50 :
-
Percentage of beat-to-beat differences greater than 50 ms
- Polvar10 :
-
Incidence of beats segments during which the beat-to-beat differences of RR intervals is less than 10 ms
- PVCs :
-
Premature ventricular complexes
- RMSsd :
-
Root mean square of successive beat-to-beat differences
- sdNN :
-
Standard deviation of NN
- TOCSY :
-
Toolbox for Complex Systems
- V :
-
Premature ventricular complex
- VF :
-
Ventricular fibrillation
- VT:
-
Ventricular tachycardia
- VTCI :
-
Ventricular tachycardia coupling interval
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Acknowledgments
The authors thank the CIHR and MITACS for financial support. J. K. and N. W. acknowledge financial support by the EU Network of Excellence, Grant No. NoE 005137 BioSim, as well as by the Deutsche Forschungsgemeinschaft Grants Nos. KU 837/23-1 and KU 837/20-2.
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Lerma, C., Wessel, N., Schirdewan, A. et al. Ventricular arrhythmias and changes in heart rate preceding ventricular tachycardia in patients with an implantable cardioverter defibrillator. Med Biol Eng Comput 46, 715–727 (2008). https://doi.org/10.1007/s11517-008-0326-y
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DOI: https://doi.org/10.1007/s11517-008-0326-y