Measuring shape variations of ECG waves through Time-Frequency Representations

Barbara Oficjalska (1) , Hervé Rix (2) , Emmanuel Chevalier (1) , Jocelyne Fayn (3) , André Varenne (4)

1 I3S - Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis
2 Laboratoire d'Informatique, Signaux, et Systèmes de Sophia-Antipolis (I3S) / Equipe SIGNAL
3 Activité électrique du coeur
4 CRECEC - Laboratoire de Cardiologie

The Distribution Function Method in two dimensions (DFM-2D) is briefly presented as an extension of the previous Distribution Function Method in one dimension (DFM-1D). This novel method is applied to the estimation of shape difference between ECG waves through time-frequency representations (spectrograms). Shape variations due to drug action were followed along one day: for T-waves with Quinidine, for P-waves and QRS complexes with Cibenzoloine. Clustering in two and three classes according to the shape distance was made too. The both methods, DFM-2D and DFM-1D, were compared using a "pure shape distance", i.e. independently of scale changes, and a distance including width variations of the waves. The results concerning shape variations are coherent for the both methods, but in any case they are enhanced by using DFM-2D. In conclusion this novel method will be interesting for early detection and fine measurements of electrophysiological effects of cardiac drugs.

Domaines: Traitement du signal et de l'image [eess.SP]; Cardiologie et système cardiovasculaire; Traitement du signal et de l'image [eess.SP]

Barbara Oficjalska, Hervé Rix, Emmanuel Chevalier, Jocelyne Fayn, André Varenne. Measuring shape variations of ECG waves through Time-Frequency Representations. European Signal Processing Conference EUSIPCO'94, Sep 1994, Edinburgh, United Kingdom. pp.70-73. ⟨hal-00545986⟩