Figure 1.

LVAT‐95 times during intrinsic rhythm and HBP in patients with LBBB. The dotted line represents the upper limit of normal (70 ms) derived from subjects with normal, narrow QRS complexes. Patients in green did not shorten LVAT‐95 by at least 10 ms with HBP (failed His‐CRT). Patients in blue shortened LVAT‐95 by at least 10 ms with HBP but did not achieve LVAT‐95 in the normal range. Patients in red shortened LVAT‐95 by at least 10 ms with HBP and achieved a LVAT‐95 within the normal range. CRT, cardiac resynchronization therapy; HBP, His bundle pacing; LBBB, left bundle branch block; LVAT‐95, left ventricular activation time of 95% of activations