AP19-00729 Abstract View

Methods : Simultaneous intra-operative mapping of endocardial (Endo) and epicardial (Epi) lateral RA wall was performed during sinus rhythm (SR), pacing drive (600ms and 400ms CL) and premature extrastimulation (PES) using two HD Grid catheters (16 electrodes, 3mm spacing). Filtered uniand bipolar electrograms (EGM’s) and electrode locations were exported into MATLAB for analyses. Activation (AM) and phase analyses (PM) were performed on unipolar EGM’s. The finite difference technique was used to assess conduction velocity (CV). Signal fractionation and voltage analyses were performed on bipolar EGM’s and comparisons made between Endo and Epi along the two orthogonal planes (horizontal [H] and vertical [V] bipolar configurations) for SR, pacing drive and PES. Signal phase at each location of the Endo surface was compared to phase timing at the opposing Epi surface. Difference of ≥20ms between paired Endo and Epi electrodes defined dissociation. Bipolar EGM’s fractionation was classified based on previously described criteria.