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A: Earliest ventricular activation without atrial/ventricular EGM fusion with a possible para-Hisian AP potential on the distal H spline micro-electrodes with close 2-mm spacing. A and B: distal His localization with identical stim to His interval on G/H spline micro-electrodes during pre-excitation and narrow QRS. The first QRS complexes are aligned to enable EGM timing comparison.
