4.5 | The feasibility of CTI block
In our study, CTI block with PFA was successfully achieved in a high percentage of patients (96.9%). CTI ablation using a focal PFA catheter routinely provokes subclinical right coronary vasospasm,17,18 which was not observed for no coronary angiography was performed in our series. Pouches among CTI were commonly observed via intracardiac echocardiography during the procedure.19 These pouches increase the difficulty of obtaining a complete CTI block, which are potential risk of cardiac tamponade for RFCA. PFA could be a good alternative to obtain CTI block when pouches were observed in CTI. So PFA could be recommended in the case of typical atrial flutter.