This study seeks to assess the acute durability of the CTI block when PEF energy is used. Second goal is to establish the optimal waiting time for the conduction recovery after PEF CTI ablation and to assess the utility of routine adenosine testing for dormant conduction. Moreover, this study aims to investigate the differences in acute efficacy and adverse events (hemolysis, coronary vasospasm) between the two available configurations (basket or flower) of the pentaspline Farawave catheter (Farapulse-Boston Scientific Inc, USA).