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A and B: Distinct proximal/distal para-Hisian AP potentials without atrial/ventricular EGM fusion on distal C/A spline micro-electrodes with close 2-mm spacing and far-field His signal (arrow). C: Antegrade His bundle activation along F spline micro-electrodes with close 2-mm spacing during pre-excitation and RBBB. The first QRS complexes are aligned to enable EGM timing comparison.
