P61 VIP–AF. CORRELATION BETWEEN VOLTAGE AND IMPEDANCE MAPPING IN PATIENTS AFFECTED BY ATRIAL FIBRILLATION: A FURTHER STEP TOWARDS SUBSTRATE CHARACTERIZATION

Abstract Background Pulmonary veins isolation (PVI) represents the main strategy for paroxysmal atrial fibrillation (AF) treatment. Due to poor clinical outcomes of PVI in case non–paroxysmal AF, significant efforts have been made develop new ablative strategies modify substrate. Up now, order characterise substrate, only bipolar voltage maps used and impedance mapping has never evaluated. Purpose Our aim is demonstrate potential correspondence among wall thickness, impedance. Atrial could represent an additional tool substrate characterization, providing further information on tissue conductive properties confirming analysis. Methods The study includes retrospective analysis 60 electro–anatomical (EA) patients with (40 patients) persistent (20 AF admitted our institution procedures performed support CARTO3 system. Map points collected Navistar RMT Thermocool ablation catheter enable evaluation values. To perform between map map, endocardial surface divided six sections. Before ablation, all a computed tomography evaluate thickness. Parameters interest that evaluated this are EGMs amplitude (mV) fractionation (> five deflections per signal) corresponding value (Ohm) at considered acquisition point. Results In PAF cases no voltages lower than 0.5 mV reported. values ranged from 140.6 169.9 Ohm, average 151.5 ± 5.4 Ohm. PsAF cases, instead, inferior 0.05 reported posterior wall, anterior roof 19/20 patients. these low areas, long duration fractionated signals dropped 129.1 3.8 ranging 110.2 Ohm 139.6 Conclusion supports association left This allows correct uncertain thanks provided by mapping.