The Canadian journal of cardiology
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Multicenter Study Comparative Study
Characterization of ventricular tachycardias based on time and frequency domain analyses of cycle length variability in patients with implantable cardioverter defibrillator.
To discriminate between monomorphic (MVT) and polymorphic (PVT) ventricular tachycardias in humans using cycle length variability (CLV), and to characterize the onset of MVT and PVT using power spectral analysis of the CLV during sinus rhythm and the number of ventricular extrasystoles before onset of arrhythmia. ⋯ Discrimination between MVT and PVT episodes was possible based on CLV analysis. The onset of PVT was characterized by a greater number of preceding extrasystoles compared with the control. During sinus rhythm, the NHF spectral power activity decreased at the onset of both types of arrhythmic episodes compared with control, although statistical significance was marginal.