Key result
WOLA filterbank algorithm detects 100% of fibrillation or flutter episodes despite far-field R-wave interference.
Why the study?
Novel methods for cardiac rhythm detection using time-frequency analysis of intracardiac electrograms are proposed to improve detection of arrhythmias such as fibrillation, flutter, and tachycardia.
A novel WOLA filterbank analysis method for intracardiac electrograms demonstrates robust and accurate detection of cardiac arrhythmias, including fibrillation and flutter, even in the presence of noise.
May enhance intracardiac beat detection via subband coherence; leaves open clinical validation before any practice change.
Novel methods of cardiac rhythm detection are proposed that are based on time-frequency analysis by a weighted overlap-add (WOLA) oversampled filterbank. Cardiac signals are obtained from intracardiac electrograms and decomposed into the time-frequency domain and analyzed by parallel peak detectors in selected frequency subbands. The coherence (synchrony) of the subband peaks is analyzed and employed to detect an optimal peak sequence representing the beat locations. By further analysis of the synchrony of the subband beats and the periodicity and regularity of the optimal beat, various possible cardiac events (including fibrillation, flutter, and tachycardia) are detected. The Ann Arbor Electrogram Library is used to evaluate the proposed detection method in clean and in additive noise. The evaluation results show that the method never misses any episode of fibrillation or flutter in clean or in noise and is robust to far-field R-wave interference. Furthermore, all other misclassification errors were within the acceptable limits.
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Sheikhzadeh et al. (2007) studied Cardiac arrhythmia (n=60). WOLA filterbank analysis algorithm vs. Physician-certified annotations was evaluated on Detection of fibrillation or flutter. The proposed WOLA filterbank analysis algorithm detected all episodes of fibrillation or flutter in clean and noisy EGM signals without missing any events, demonstrating robustness to far-field R-wave interference.
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