Parameters
Young (<85) N=152 Elderly (≥85) N=37
P value
LBB pacing, n (%) 128 (84.2) 33 (89.2) 0.44
Fluoroscopic time, min 11.4 [7.0, 16.2] 11.5 [7.2, 16.2] 0.93
Fluoroscopic dosage, mGy 130.1 [88.8, 273.7] 117.3 [89.8, 248.0] 0.74
Intrinsic QRS duration, ms 110.5±23.4 113.5±21.0 0.51
Paced QRS duration, ms 107.4±8.8 106.6±10.7 0.15
LBB block, n (%) 12 (8.0) 2 (5.4) 0.87
RBB block, n (%) 23 (15.2) 8 (21.6) 0.34
p-LVAT, ms 75.6±10.2 74.4±8.6 0.57
Lead depth, cm 12 [11, 12] 11 [11, 12] 0.07
Pacing parameters
Threshold, V 0.9±0.6 0.8±0.3 0.12
Sense, mV 12.1±5.0 12.9±5.0 0.43
Impedance, Ω 708.0±168.1 699.8±170.0 0.79