Comparison of Two <scp>ICE</scp> ‐Guided Transseptal Puncture Strategies for Zero‐Fluoroscopy <scp>AF</scp> Ablation—A Randomized Controlled Trial

Background: Transseptal puncture (TSP) is a critical step in left atrial (LA) access for atrial fibrillation (AF) ablation. Intracardiac echocardiography (ICE) combined with electroanatomical mapping now enables zero-fluoroscopy TSP in experienced practice. Two ICE-guided TSP strategies are used in contemporary clinical settings; however, their efficiency, safety, and learning curves have not been directly compared. Methods: This prospective randomized controlled trial was conducted at National Taiwan University Hospital between February 2023 and April 2024. Patients undergoing first-time AF ablation were randomized to two TSP strategies: Protocol A advanced the transseptal sheath from the superior vena cava to the fossa ovalis under ICE guidance, whereas Protocol B used a mapping catheter to identify the fossa and guide sheath positioning. Procedural duration, TSP metrics, and learning curve were assessed. Patients were followed for periprocedural complications and AF recurrence for one year. Results: = 0.018). Protocol B exhibited a steeper learning curve, achieving comparable efficiency after approximately 10 cases. Both strategies achieved successful LA access and 100% pulmonary vein isolation, with no differences in complication rates or one-year AF recurrence. Conclusions: Both ICE-guided strategies are safe and effective for zero-fluoroscopy TSP. Protocol A offers greater early efficiency, whereas Protocol B demonstrates rapid adaptability, supporting practical positioning of these complementary strategies in radiation-free AF ablation.