Pulsed field ablation (PFA), a promising technology for ablating arrhythmias, has significantly better efficiency and potentially greater safety than traditional ablation techniques using thermal injury. However, most clinical research on PFA for ablation to date has used basket- or flower-shaped catheters, thus requiring a large introducing sheath and catheter location under fluoroscopic guidance. Herein, we describe our initial experience in using a three-dimensional PFA system integrating mapping and ablation, and an annular catheter.