2.5 Criteria of successful LBB capture.
Successful LBB capture was considered in the presence of a narrow paced
QRS (<120ms) or in the presence of a left bundle branch
potential on the sensed electrogram. When absent, short and stable pLVAT
at differential high and low pacing output was used to confirm LBB
capture. This was defined as pLVAT <85ms (for narrow native
QRS) or <100ms (for wide native QRS or a complete AV block at
baseline).[8–10]