1. Pugazhendhi Vijayaraman et al. JACEP 2015;1:571-581
Identifying Distal His Bundle Electrogram in Intra-His Atrioventricular Block (A) Twelve-lead electrocardiogram of a patient with 2:1 atrioventricular (AV) block and normal QRS. Pacing from the lead at the His bundle locations shown in the figure results in nonselective His bundle capture with minimal fusion. (B) Intracardiac electrogram from the His bundle pacing lead at the proximal His bundle location (H1) demonstrates 2:1 HV block. The pacing threshold at this site was 3 V at 0.5 ms. (C) Moving the pacing lead slightly more distally identifies the distal His electrogram (H2) beyond the site of intra-His block. Pacing threshold at this site was 1 V at 0.5 ms.
Pugazhendhi Vijayaraman et al. JACEP 2015;1:
American College of Cardiology Foundation