[Spatial distribution of high-frequency components in the terminal QRS complex in patients with ventricular tachycardia and previous myocardial infarction--comparison of late potential map and spectral analysis].

It is clinically important to predict the ventricular tachycardia (VT) for the prognosis in patients with previous myocardial infarction. Low-amplitude high-frequency components observed at the end of QRS complex, termed "late potentials" are associated with VT. The use of signal-averaged body surface mapping technique enabled us to study spatial distributions of high-frequency components in the QRS terminal portion. In this paper, we investigated body surface distributions of high-frequency components in the terminal QRS complex, compared with late potential map and spectral analysis. Signal-averaged body surface mapping will provide new electrical information regarding understanding of the high-frequency components in the QRS complex.