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. 2022 Sep 30;9:1006966. doi: 10.3389/fcvm.2022.1006966

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Copyright © 2022 Zhu, Li, Liu, Chang and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Flowchart for confirming LBB capture. LBB, left bundle branch; LBBB, LBB block; NSLBBP, non-selective LBB pacing; SLBBP, selective LBB pacing; LVSP, left ventricular septal pacing; HF, heart failure; Stim-LVAT, stimulus artifact to left ventricular activation time in lead V5 or V6; LVAT, left ventricular activation time; IDT, the native V6 intrinsicoid deflection time, measured from the earliest QRS onset in any surface lead (global method), not to the point of the highest amplitude, but to the end of the slur/plateau in QRS, that is to the beginning of the final rapid downsloping phase of R wave in lead V6; TCT, the transseptal conduction time, measured from earliest QRS onset in any surface lead to the endocardial indication of the arrival of the depolarization wavefront to the LBB area; ΔStim-LVAT, the Stim-LVAT discrepancy between His bundle pacing and LBBP or LVSP; ΔStim-LVAT%, ΔStim-LVAT divided by Stim-LVAT of His bundle pacing.