Of note, the His bundle electrogram was recorded in the posterior septum of the morphologic right atrium. Baseline intracardiac intervals were normal (atrial-His [AH] 64 ms, His-ventricular [HV ...
Using a retrograde aortic approach a quadripolar electrode catheter was placed across the aortic valve overt the upper left ventricular septum, where a His bundle electrogram was recorded (Fig.
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