Procedural characteristics His Pacing LBBA Pacing P-value
Intrinsic QRS (ms) 135.4 ± 29.1 131.0 ± 34.6 p = 0.505
Post-implant paced QRS (ms) 119.8 ± 21.2 116.7 ± 15.2 p = 0.443
Reduction in QRS Duration 0.86 ± 0.18 0.91 ± 0.23 p = 0.314
Follow up QRS Duration (ms) 120.1 ± 20.5 115.9 ± 13.5 p = 0.336
Reduction in QRS Duration 0.87 ± 0.19 0.91 ± 0.24 p = 0.519
QRS ≤ 120 ms 26/42 (61.9%) 29/44 (65.9%) p = 0.622
R-wave peak time (ms) 80 ± 22.9 76.4 ± 14.5 p = 0.370
Procedure duration (min) 124.7 ± 50.4 105 ± 28.8 p = 0.023
Fluoroscopy time (min) 19.8 ± 15.9 13.7 ± 7.4 p = 0.019
Pacing Parameters
Post procedure
Threshold Amplitude (V @ 0.5 ms) 1.1 ± 1.0 0.54 ± 0.3 p < 0.001
R-Wave Amplitude (mV) 8.7 ± 6.1 11.9 ± 5.7 p = 0.035
Impedance (ohms) 615.3 ± 209.8 715.0 ± 154.2 p = 0.012
First follow up
Days from implant 43.4 ± 38.3 44 ± 30.2 p = 0.944
Threshold Amplitude (V @ 0.5 ms) 1.4 ± 1.046 0.7 ± 0.3 p < 0.001
R-Wave Amplitude (mV) 8.6 ± 6.4 16.0 ± 4.9 p < 0.001
Impedance (Ohms) 454.0 ± 118.4 540.3 ±59.6 p < 0.001
Last Follow-Up
Days from implant 398.8 ± 259.3 228 ± 124.3 p < 0.001
Paced QRS duration 123.0 ± 20.5 116 ± 16.1 p = 0.186
Left Ventricular Ejection Fraction 50.6 ± 13.9 55.5 ± 13.1 p = 0.207
Bipolar Pacing at Most Recent Follow-Up 38/41 (92.7%) 43/43 (100%) p = 0.071
Unipolar Pacing at Most Recent Follow-Up 3/41 (7.3%) 0/43 (0%) p = 0.071
Threshold Amplitude (V @ 0.5 ms) 2.1 ± 2.2 0.8 ± 0.3 p < 0.001
R-Wave Amplitude (mV) 8.90 ± 6.6 16.1 ± 4.5 p < 0.001
Impedance (Ohms) 434.2 ± 108.1 535.5 ± 56.8 p < 0.001
Lead revision (%) 6/45 (13.3%) 0/42 (0.0%) p = 0.014