REPRESENTATIONS OF ECG - LATE POTENTIALS IN THE TIME-FREQUENCY PLANE

It is shown that time frequency signal analysis could be a useful tech nique in detecting late potentials (LP). In particular, the spectrogra m, the Wigner distribution and the wavelet transform have been applied to ECG signals from patients with sustained ventricular tachycardia. Comparisons of the three algorithms reveals that much better time loca lization is achieved by the wavelet transform. Moreover, it is conclud ed that a separation between healthy subjects and patients could be ob tained based upon time frequency analysis.