PO-01-166 OUTCOMES FROM REDO ABLATION OF PERSISTENT AF USING SPATIOTEMPORAL DISPERSION MAPPING IN AN INTERNATIONAL TWO CENTRE SERIES

Strategies for redo ablation of persistent atrial fibrillation are debated. This has led to emergence additional beyond the pulmonary veins targeting dynamically mapped mechanisms. Spatiotemporal dispersion is such a technique using stable electrograms spanning more than 75% cycle length over multipolar catheter and shown benefit in recent trials. We set out study an international two centre series clinical outcomes this ablations. recruited consecutive patients between September 2018 2021 undergoing AF. Patients were all Pentaray mark areas spatio-temporal (STD) criteria before any ablation. After confirming vein isolation, or re-isolation if connections present, STD was performed. Areas remapped patient remained AF, prove impact local ablation, including right atrium. If termination AT occurred, conventional methods. who terminated sinus underwent reinduction pacing protocols map further AF inducible. followed up at 12 months with 5-7 days continuous event monitor. In total 168 studied (age 66, 68% male, LA diameter 4.8cm). They had undergone 1.4 procedures on average. Over 50% isolated start case. Termination rhythm (42%) flutter tachycardia (41%) obtained 140 (83%). Mean procedure duration 267 min, average number sites 2.7. The atrium 79 (46%) patients, 1.2 locations treated At months, freedom from 74% overall. Of recurrences, only 11 (7%) 93% recurring AFL. Figure shows patterns (green arrows) Pentarray 67 year old man inferior left (A), where (B). ablations, use mapping increased rates acute months. Clinical recurrences most often organised tachycardia. Our informs real world application common scenario when already isolated.