To clarify the etiology of the prepotentials (PPs) between the end of P wave and the onset of QRS complex (P'-R segment) in signal averaged electrocardiogram (SAECG), SAECG was recorded in 26 healthy volunteers and 15 patients with idiopathic left ventricular tachycardia (VT) and electrophysiologic study (EPS) was done in those 15 VT patients. The PPs which had three components (PP1, PP2, PP3) ...
