Table 2.
Procedure details
| Overall (N = 925) | LLL (n = 655) | SDL (n = 270) | P value | |
|---|---|---|---|---|
| Implanted device type | <.001 | |||
| Single-chamber PM | 75 (8) | 53 (8) | 22 (8) | |
| Dual-chamber PM | 709 (77) | 479 (73) | 230 (85) | |
| CRT device | 141 (15) | 123 (19) | 18 (7) | |
| LBBAP lead implant time (min) | 23 ± 11 | 24 ± 23 | 21 ± 15 | .006 |
| LBBAP implant fluoroscopy (min) | 11 ± 9 | 12 ± 9 | 10 ± 8 | .010 |
| No. of screw attempts | 2.6 ± 1.8 | 2.6 ± 1.8 | 2.5 ± 1.8 | .644 |
| No. of lead turns >15∗ | 308 (51)a | 283 (63)a | 25 (16)a | <.001 |
| LBBAP success | 852 (92) | 624 (95) | 228 (84) | <.001 |
| LBBAP criteria | <.0001 | |||
| LBBP criteria | 575 (62) | 427 (65) | 148 (55) | |
| LVSP criteria | 277 (30) | 197 (30) | 80 (30) | |
| "r" prime in lead V1 | 810 (88) | 588 (90) | 222 (82) | .009 |
| LB potential | 401 (43) | 311 (47) | 90 (33) | <.0001 |
| QRS transition during pacing threshold | 385 (42) | 278 (42) | 107 (40) | .508 |
| V6 RWPT (ms) | 82 ± 16 | 82 ± 16 | 81 ± 15 | .365 |
| V1–V6 interpeak (ms) | 40±13 | 40±13 | 39 ±13 | .379 |
| Paced QRS axis | <.001 | |||
| Inferior | 311 (34) | 246 (38) | 65 (24) | |
| Intermediate | 322 (35) | 227 (35) | 95 (35) | |
| Superior | 264 (29) | 171 (26) | 93 (34) | |
| Septal lead position | <.001 | |||
| Basal | 108 (12) | 83 (13) | 25 (9) | |
| Mid-basal | 699 (76) | 511 (78) | 188 (69) | |
| Mid-apical | 70 (8) | 32 (5) | 38 (14) | |
| R-wave sensing (mV) | 10.8 ± 5.7 | 10.9 ± 5.8 | 10.3 ± 5.3 | .112 |
| Pacing threshold (V) | 0.86 ± 0.39 | 0.80 ± 0.34 | 1.0 ± 0.46 | <.001 |
| Impedance (Ω) | 912 ± 34 | 948 ± 235 | 822 ± 208 | <.001 |
| Final paced QRS duration (from pacing spike) (ms) | 155 ± 19 | 156 ± 20 | 153 ± 17 | .016 |
| Final paced QRS duration (only QRS) (ms) | 115 ± 15 | 115 ± 15 | 114 ± 15 | .193 |
Values are given as n (%) or mean ± SD unless other indicated.
LB = left bundle; LBBAP = left bundle branch area pacing; LBBP = left bundle branch pacing; LVSP = left ventricular septal pacing; PM = pacemaker; RWPT = R-wave peak time; other abbreviations as in Table 1.
∗
Number of lead turns was evaluated in 610 patients (450 with LLLs and 160 with SDLs).