Overall group (n = 50) HBP LBBAP P
Bundle branch block, n 26 24 .98
RBBB, n (%) 14 (53.8) 13 (54.2)
LBBB, n (%) 12 (46.2) 11 (45.8)
Overall success, n (%) 20 (76.9%) 22 (91.7) .25
RBBB success, n (%) 12 (87.5) 11 (84.6) 1
LBBB success, n (%) 8 (66.7) 11 (100) .09
Overall success (n = 42) HBP (n = 20) LBBAP (n = 22) P
Baseline QRS, ms 172 ± 36 164 ± 19 .42
Paced QRS, ms 124 ± 20 109 ± 8 <.01
QCI, % –26 ± 14 –33 ± 8 .07
QRS ≥ 120 ms after implantation, n (%) 12 (60) 4 (18.2) .01
LBBB success (n = 20) HBP (n = 8) LBBAP (n = 11) P
Baseline QRS, ms 190 ± 39 172 ± 19 .27
Paced QRS, ms 127 ± 26 112 ± 9 .16
QCI, % –32 ± 13 –34.8 ± 4.8 .59
QRS ≥ 120 ms after implantation, n (%) 6 (75) 3 (27.3) .07
RBBB success (n = 32) HBP (n = 12) LBBAP (n = 11) P
Baseline QRS, ms 159 ± 30 156 ± 16 .73
Paced QRS, ms 122 ± 16 107 ± 7 <.01
QCI, % –21 ± 14 –31 ± 10 .09
QRS ≥ 120 ms after implantation, n (%) 6 (50) 1 (9.1) .07