Pulsed Field Ablation in the Coronary Sinus: Feasibility and Safety of a Novel Approach for Mitral Isthmus Block

Why This Study Is Important * Many patients with atrial fibrillation (AF) continue to experience abnormal heart rhythms even after receiving standard treatments. * Standard heat-based energy can be difficult to use in these areas because fast blood flow cools the tissue, and excessive heat may damage nearby structures like the right coronary artery. Our Approach * Investigators are testing a newer technology called pulsed field ablation (PFA). * Unlike traditional methods, PFA uses ultra-short electrical pulses rather than heat to target heart cells specifically while protecting neighboring nerves and blood vessels. * This study focuses on applying this energy within the coronary sinus to help achieve a more complete and lasting electrical block for the mitral isthmus. What To Expect * This study involves 30 participants who are already undergoing a catheter ablation procedure for atrial fibrillation. * The research team will monitor how successful the procedure is at immediately stopping the abnormal electrical signals. * Participants will have follow-up visits over six months to check for any returning heart rhythm issues and will receive a specialized heart scan (CTA) to ensure the nearby coronary arteries remain healthy

NCT Number	NCT07577544
Lead Sponsor	Shanghai Zhongshan Hospital
Conditions	Atrial Fibrillation (AF)
Enrollment	30 participants
Start Date	2026-05-15
Primary Completion	2026-05-31 (estimated)
Study Completion	2026-06-30 (estimated)
Updated on ClinicalTrials.gov	2026-05-13