Table 3.
Electrical parameters in the different subgroups
| Overall |
Patients without structural heart disease |
Last 100 patients |
||||
|---|---|---|---|---|---|---|
| LLL (n = 655) | SDL (n = 270) | LLL (n = 280) | SDL (n = 151) | LLL (n = 100) | SDL (n = 100) | |
| Implant electrical parameters | ||||||
| Sensed R-wave amplitude (mV) | 10.9 ± 5.8 | 10.3 ± 5.3 | 11.2 ± 5.5 | 10.4 ± 5.4 | 9.9 ± 5.4 | 10.5 ± 5.4 |
| Unipolar pacing threshold (V) | 0.80 ± 0.34 | 1.0 ± 0.46∗ | 0.79 ± 0.34 | 0.96 ± 0.41∗ | 0.96 ± 0.42 | 1.0 ± 0.55 |
| Unipolar lead impedance (Ω) | 948 ± 235 | 822 ± 208∗ | 940 ± 239 | 788 ± 201∗ | 1041 ± 202 | 838 ± 211∗ |
| Paced QRS duration (from pacing spike) (ms) | 156 ± 20 | 153 ± 17∗ | 149 ± 17 | 149 ± 15 | 164 ± 20 | 154 ± 15∗ |
| Paced QRS duration (only QRS) (ms) | 115 ± 15 | 114 ± 15 | 111 ± 13 | 111 ± 14 | 121 ± 14 | 115 ± 14∗ |
| Last follow-up electrical parameters† | ||||||
| Sensed R-wave amplitude (mV) | 15.4 ± 7.2 | 13.4 ± 5.4∗ | 15.9 ± 7.5 | 12.9 ± 5.1∗ | 17.1 ± 8.5 | 13.1 ± 5.3∗ |
| Unipolar pacing threshold (V) | 0.84 ± 0.94 | 0.88 ± 0.34 | 0.88 ± 0.87 | 0.95 ± 0.37 | 0.85 ± 0.36 | 1.01 ± 0.36∗ |
| Unipolar lead impedance (Ω) | 481 ± 102 | 508 ± 123∗ | 505 ± 101 | 534 ± 102∗ | 512 ± 74 | 556 ± 89∗ |
Values are given as mean ± SD.
Abbreviations as in Table 1.
∗
Indicates statistical significance (P <.05) in comparison of LLLs vs SDLs.
†
Median follow-up 16.4 [9.6–24.6] months.