Fig. 1

Mapping and ablation of PVCs from L-RCC LIT. a. 12-lead electrocardiogram of PVCs; b. RF energy had been applied on the site with earliest Purkinje potential in left ventricular anterosuperior septum, but the PVCs was not ablated. During PVCs, the earliest ventricular activation preceding the QRS onset by 25 ms was found in L-RCC interleaflet triangle and no Purkinje potential was recorded at this site. c1~c2 and d1~d2 The target site was confirmed by both angiography and three-dimension electroanatomical system. e. The PVCs diappeared within 10s during discharging on target site and the radiofrequency delivery was continued for 60 to 180 s. The patient has been followed up for 2.4 years without recurrence of PVCs. Annotation: PP=Purkinje potential, ABL=Ablation, RAO=Right anterior oblique position, LAO=Left anterior oblique position, RCC= Right coronary cusp, LCC=Left coronary cusp, NCC=noncoronary cusp, ILT=Interleaflet triangles, RFon=Radiofrequency on