PO-04-099 OUTCOME AFTER PULSED FIELD ABLATION IN PATIENTS WITH COMPLEX CONSECUTIVE ATRIAL TACHYCARDIA IN CONJUNCTION WITH ULTRA-HIGH DENSITY MAPPING

Catheter-ablation (CA) of consecutive left atrial tachycardias (LAT) can be challenging. Pulsed field ablation (PFA) yields a novel non-thermal CA technology for treatment fibrillation (AF). There is no data regarding PFA LAT. This study sought to investigate the outcome in LAT following prior AF. Consecutive patients with underwent ultra-high-density (UHDx) mapping. Subsequent identification AT mechanism, was performed at assumed critical sites maintenance. Continuous lines were if required and evaluated pre- post HDx-mapping. Follow up conducted by telephone interview, routine 24hrs Holter-ECGs control implantable cardiac devices, applicable. Fifteen (age 70±10, male 73%) who 3±2 AF-CA procedures included. The total mean procedure fluoroscopy times 141±43 18±10 minutes, respectively. All 19 (100%) successfully ablated PFA. Two located right atria RF-ablation. identified as localized reentry (n=1) macro-reentry (n=18) targeted terminated either sinus rhythm (9/15) or secondary (6/15 subsequently SR); 63% (12/19) first PFA-application. (13 roof, 11 anterior, 1 mitral) blocked. LA-posterior-wall isolation (LAPWI) achieved when (10/10). Preliminary AF/AT free survival 80% (12/15) after 153 [88-207] days follow-up. No related complications occurred. feasible safe promising outcome. Successful creation LAPWI short time. may offer opportunity effective arrhythmias beyond