PO-03-096 DEFINING RECORDING ANTENNA FOR ATRIAL ELECTRODES BY ENDOCARDIAL AND EPICARDIAL COMPUTER MAPPING

Mapping arrhythmias and concretely atrial fibrillation (AF) is complicated by our inability to determine local from far field electrograms, as interfere with the identification of activity in specific electrode location. In particular, how “local” on any catheter not yet biophysically defined. We tested hypothesis that EGM conformation configurations can be explained modelling biophysical relation between size separation active myocardial tissue. modelled laminar conduction tissue 30x30x3 mm a 1 electrode, discretized into 100.000 100 nodes respectively (fig. A) simulating propagation waves constant direction at different velocities. The was constructed using electric potential transfer equation this for each node evaluate individual contributions regions construct unipolar (fig B) bipolar C) signals. This allowed unify near definition all types electrodes contributing least 30% respect maximal contribution. Figure B, recorded circle radius 8 endocardially, 2.7 transmurally 1.9 ratio endo-to-epicardial amplitude. Bipolar showed directional antennas aligned radii 1.7, 5.7 8.3 2, 5, 10 spacing C). less transmural variability antenna, 2 D). These data show signals clinical catheters represent 1.7 ∼8 spheres. Studies are required define optimal map AF, ventricular fibrillation, tachycardia.