Fig. 3

Mapping and ablation of PVCs from Failure group. a. 12-lead electrocardiogram of PVCs; b. The earliest Purkinje potential preceded the QRS onset by 22 ms in sinus rhythm and preceded the QRS onset by 24 ms in PVCs, RF on the site of earliest Purkinje potential did not terminate the PVCs; c. Pacing the sites mapped with earliest ventricular activation led to a poor match, pacing reproduced QRS morphology was similar to the clinical PVCs in just 9 leads of 12 leads, RF on the site of earliest ventricular activation did not terminate the PVCs