Learning Curve Analyses for Left Bundle Branch Area Pacing with Conventional Stylet-Driven Pacing Leads
Table 3
Procedural outcomes of LBBAP before and after reaching the learning curve.
All (N = 50)
Early (1–24th case)
Late (25–50th case)
value
Acute outcome
Success of LBBAP
50/50 (100.0%)
24/24 (100.0%)
26/26 (100.0%)
1.000
Success of LBBP
49/50 (98.0%)
23/24 (95.8%)
26/26 (100.0%)
0.968
Procedural characteristics
LBB potential
31 (62.0%)
13 (54.2%)
18 (69.2%)
0.451
Stim-LVAT (ms)
73.0 ± 10.7
73.1 ± 14.0
73.0 ± 6.8
0.959
Transition from nonselective LBB capture to selective LBB capture
6 (12.0%)
3 (12.5%)
3 (11.5%)
1.000
Numbers of attempts (n)
2.0 ± 0.9
1.8 ± 0.8
2.1 ± 1.1
0.604
Numbers of sheath change (n)
0.2 ± 0.5
0.2 ± 0.6
0.1 ± 0.3
0.319
Fluoroscopy time (min)
15.1 ± 13.5
20.5 ± 17.7
10.0 ± 3.6
0.009
Procedure time (min)
59.9 ± 24.8
68.1 ± 32.4
52.4 ± 10.9
0.032
Pacing parameters
Sensed R wave amplitude (mV)
10.8 ± 4.8
11.8 ± 4.9
9.9 ± 4.6
0.186
Ventricular capture threshold (V)
1.0 ± 1.2
0.8 ± 0.3
1.2 ± 1.6
0.221
Ventricular pacing impedance (Ω)
675.7 ± 97.5
689.5 ± 84.3
663.0 ± 108.3
0.340
QRS duration
Baseline QRS duration (ms)
127.7 ± 29.6
135.2 ± 29.5
120.8 ± 28.6
0.086
Post-LBBAP QRS duration (ms)
117.2 ± 19.0
113.2 ± 20.9
120.8 ± 16.6
0.156
Complications
Complication
4 (8.0%)
2 (8.3%)
2 (7.7%)
1.000
Major complication
2 (4.0%)
2 (8.3%)
0 (0.0%)
0.435
Values are presented as mean ± standard deviation or n (%). LBBAP, left bundle branch area pacing; LBBP, left bundle branch pacing; LBB, left bundle branch pacing; stim-LVAT, stimulus to left ventricular activation time.
