Fig. 1
Radiofrequency catheter ablation of PVCs rising from MSPA 16 mm above PLC. a ECG of the PVCs. The PVCs exhibited a left bundle branch block (LBBB) morphology and inferior axis deviation, r morphology in lead I, QS morphology in both aVL and aVR with QSaVR>QS aVL, rS pattern in lead V1-V2, R morphology in lead II, III, aVF and V4-V6 with an ascending notch, precordial transition zone between lead V2-V3. High R wave was recorded in inferior leads with an average amplitude more than 3.0 mV. b Activation mapping of the PVCs. Activation mapping in MSPA above PLC showed a local ventricular activation with initial discrete potential preceding the QRS onset by 32 ms. c Pace mapping of the target site. Pacing mapping performed on the site with earliest ventricular activation showed an excellent pace match between paced QRS and clinical PVCs. d PVCs disappeared after energy application on target site for 6 s. e, f Left anterior oblique projection of the target site (the tip of the catheter). g Right anterior oblique projection of the target site (the tip of the catheter)