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. 2016 May 24;32(6):499–501. doi: 10.1016/j.joa.2016.04.004

Fig. 1.

Fig. 1.

(A) The patient׳s native cardiac rhythm showing 2:1 AV block with narrow QRS complexes (QRS duration of 90 ms). (B) ECG at admission. Atrial sensed ventricular pacing with QRS duration of 140 ms. (C) ECG immediately after implantation of HB pacing lead. Atrial sensed ventricular pacing (BiV pacing mode) suggesting nonselective HBP (His-capture fused with ventricular septal capture) evidenced by a narrow QRS with a duration of 110 ms and the presence of a slurred upstroke immediately after pacing spike indicating local myocardial capture. Also note T-wave changes suggesting cardiac memory. (D) ECG at the 1-week follow-up recorded at pacing output setting of 0.75 V/0.4 ms (HB threshold). Note the isoelectronic interval between the pacing spike and QRS onset and QRS morphology similar to native QRS, suggesting pure HB capture. (E) ECG at the 6-month follow-up. AV sequential pacing (BiV pacing mode) showing nonselective HBP with QRS duration of 105 ms.