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Baseline pacing trans-isthmus interval of 118 ms as measured from the pacing stimuli on electrode 1/2 of the HALO catheter to the atrial electrogram detected by electrode 9/10 on the coronary sinus catheter. In basal conditions the electrical impulse from the posterolateral tricuspid spreads around the tricuspid with two wave fronts, one in a clockwise direction (along the side wall) and another counterclockwise (along the rear wall and medial).
