Baseline characteristics
Patients underwent pacemaker implantation for sick sinus syndrome, high
degree atrioventricular block, complete heart block and/or cardiac
resynchronization therapy. There were no significant differences amongst
indications in HBP vs LBBAP groups. Equal numbers of patients in both
groups (20%) developed indications for pacing following transcatheter
aortic valve replacement. Patients undergoing HBP were younger than
those who underwent LBBAP (73.2±15.3 vs 78.2±9.2 years, p = 0.047).
Though there was a non-significant trend towards more patients in the
HBP group with ischemic or non-ischemic cardiomyopathy, the HBP group
had a lower LV ejection fraction compared to the LBBAP group (51.0±15.9
vs 57.0±13.1%, p = 0.044). There was no significant difference between
pre-procedural intrinsic QRS width (135.4±29.1 vs. 131.0±34.6 ms, p =
0.505), incidence of right bundle branch block or left bundle branch
block (37.5 vs. 42.0%, p = 0.649; 25.0 vs. 22.0%, p = 0.726) between
groups (Table 1 ).