Key result
FFT analysis of intracardiac electrograms revealed a mean difference between normal sinus rhythm and ventricular tachycardia of 8 Hz in the peak amplitude point and 18 Hz in the -3 dB point.
Why the study?
Does FFT analysis of intracardiac electrograms identify spectral differences to differentiate ventricular tachycardia from normal sinus rhythm?
Observational (n=33)
Does FFT analysis of intracardiac electrograms identify spectral differences to differentiate ventricular tachycardia from normal sinus rhythm?
Mean Difference: 8
FFT analysis of intracardiac electrograms identifies spectral differences between VT and rapid NSR, suggesting that variable-passband programmable filters could improve VT detection and prevent inappropriate shocks in pacemakers.
May aid frequency-based VT discrimination in devices; leaves open whether adaptive filters improve detection in prospective trials.
Presently available antitachycardia pacemakers detect ventricular tachycardia (VT) by measurement of the period of the intracardiac electrogram (EGM). The resulting inability to differentiate between VT and rapid normal sinus rhythm (NSR) can cause inappropriate pacemaker output, possibly initiating an arrhythmia where none existed previously. It is reported that FFT analysis of matched-pair NSR-VT EGM recordings from 33 patients revealed a mean (+or-SD) NSR-VT difference in the peak amplitude point of 8 (+or-7) Hz and a difference of 18 (+or-18) Hz in the -3 dB point. NSR-VT amplitude differences could be significantly increased by filtering over the range of greatest spectral differences. Variable-passband programmable filters could enhance VT detection in antitachycardia pacemakers.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Pannizzo et al. (1988) conducted an observational in Ventricular tachycardia (n=33). FFT analysis of intracardiac electrograms vs. Normal sinus rhythm vs Ventricular tachycardia was evaluated on Difference in the peak amplitude point and -3 dB point between normal sinus rhythm and ventricular tachycardia (MD 8 Hz (peak amplitude) and 18 Hz (-3 dB point)). FFT analysis of intracardiac electrograms revealed a mean difference between normal sinus rhythm and ventricular tachycardia of 8 Hz in the peak amplitude point and 18 Hz in the -3 dB point.
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