© 2000 by European Society of Cardiology
Identification of post-myocardial infarction patients prone to ventricular tachycardia using time–frequency analysis of QRS and ST segments
INSERM U121 and Division of Clinical Electrophysiology, Hôpital Cardiologique Louis Pradel Lyon, France
BACKGROUND: Late potentials (LPs) in the terminal portion of the QRS complex are commonly sought to identify post-myocardial infarction patients prone to ventricular tachyarrthythmias (VT) or sudden death. More recent time–frequency signal processing tools have been shown to provide new parameters for the quantification of LPs and abnormal activities buried within the QRS complex.
METHODS AND RESULTS: The study population comprised 23 myocardial infarction patients with documented sustained VT (MI+VT), 40 myocardial infarction patients without VT (MI–VT) and 31 normal subjects. The reproducibility of the method was tested in an additional set of 66 patients. The signal-averaged high-resolution electrocardiograms (HRECGs) were quantified by deconstructing the unfiltered X, Y and Z leads using a 511-orthogonal wavelet network. Using receiver operating characteristics (ROC) curves and discriminant analysis applied to the wavelet coefficients, we extracted the most significant wavelets to classify the post MI patients. These wavelets detected time–frequency alterations both in the ST segment and within the QRS complex, characterizing patients prone to VTs. The same statistical methods were applied to the conventional time-domain measurements. The combined application in our population of the orthogonal wavelet deconstruction method and discriminant analysis had 91% sensitivity and 95% specificity, an improvement of 22% and 25%, respectively, compared with the conventional time–domain method. Reproducibility was 82%.
CONCLUSIONS: In post-myocardial infarction patients, orthogonal wavelet transforms can detect alterations in high-frequency components within the QRS and ST segment. Our findings support the view that waveletrelated parameters are more relevant than those of the time–domain method in predicting subsequent malignant tachyarrhythmias.
Key Words: Orthogonal wavelet transform, high-resolution electrocardiograms, ventricular tachycardia, step by step linerar discriminant analysis, ROC curves
Correspondence: J. P. Couderc, PhD, 601 Elmwood Av., Box 653, Rochester, New York 14642, U.S.A.
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