[Ablation]
A L8.5 Swartz sheath was delivered through the right femoral vein access, a saline-irrigated ablation catheter was delivered to the proximity of His bundle via the sheath [Fig2①] . Ablation was initiated from proximity of His bundle with a set of 30 W, 43℃, and a flow rate of 17 ml / min until complete atrioventricular block indicated the success of ablation [Fig2②] . Further lesions were consolidated for 120 s (43℃; 30 W) without complications then followed by withdraw of catheter.
Finally, fixed the pacing lead, connected leads to relative channels, the left ventricular pacing was programmed to 80ms ahead of RV. The total X-ray exposure time was 16 minutes with no occurrence of complications. The outline for the procedure is shown in Table1[Table 1] .