Key result
Filtering intracardiac electrograms with a bandwidth of 10-80 Hz for correlation waveform analysis and 20-80 Hz for difference of area provided discriminatory power equivalent to wideband recordings.
Why the study?
Does specific filtering bandwidth affect the discriminatory power of morphological methods for arrhythmia detection in implantable devices?
Does specific filtering bandwidth affect the discriminatory power of morphological methods for arrhythmia detection in implantable devices?
Specific filtering bandwidths (10-80 Hz for CWA and 20-80 Hz for DOA) can maintain the discriminatory power of morphological arrhythmia detection methods while potentially reducing signal requirements in implantable devices.
Narrower filtering may preserve morphological arrhythmia discrimination in devices; leaves open in vivo validation and longevity gains.
Morphological analysis of intracardiac electrograms (ICEs) has been proposed as a complementary method for discrimination of monomorphic ventricular tachycardia from sinus rhythm by implantable pacemaker-cardioverter-defibrillators. This study compared the impact of filtering on two previously proposed time-domain methods: (1) correlation waveform analysis (CWA-independent of both amplitude fluctuation and ICE baseline) and (2) difference of area (DOA-dependent on amplitude fluctuation and ICE baseline). Using a statistical validation method for nonparametric distributions requiring 75% separation with 95% confidence interval, it was found that with CWA a bandwidth of 10-80 Hz gave results equivalent to that in wideband recordings, and in DOA a bandwidth of 20-80 Hz retained equivalent discriminatory power. A further increase in the lower passband limit (20-80 Hz for CWA and 30-80 Hz for DOA) reduced effectiveness of the methods.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Chiang et al. (2002) studied Arrhythmia (monomorphic ventricular tachycardia vs sinus rhythm). Filtering bandwidths vs. Wideband recordings was evaluated on Discriminatory power for arrhythmia detection. Filtering intracardiac electrograms with a bandwidth of 10-80 Hz for correlation waveform analysis and 20-80 Hz for difference of area provided discriminatory power equivalent to wideband recordings.
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