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His bundle mapping on the right septum. Twelve-lead electrocardiogram and intracardiac electrograms from the His bundle pacing lead and right ventricle are shown. His (H) to ventricle intervals are 65, 60, and 50 ms in the proximal, mid, and distal His locations on the right side. Pacing from the distal His location did not correct the left bundle branch block (LBBB).
