Table 2.
CRT implantation and follow up characteristics
| Target group (n = 6) | Non-target group (n = 9) | p-value | |
|---|---|---|---|
| Distance to target sites | |||
| Distance to target (mm) | 8 [0–22] | 26 [17–46] | 0.04 |
| Distance to infarct (mm) | 22 [21–23] (n = 2) | 26 [14–51] | 0.51 |
| Distance to left phrenic nerve (mm) | 44 [18–54] | 44 [36–n/a] | 0.61 |
| Implantation characteristics | |||
| Implantation duration (min) | 146 ± 38 | 127 ± 35 | 0.38 |
| LV lead implantation duration (min) | 47 ± 18 | 55 ± 28 | 0.57 |
| Fluoroscopy time (min) | 36 ± 15 | 28 ± 12 | 0.30 |
| Total radiation dose (cGycm2) | 6758 ± 4201 | 8242 ± 6446 | 0.70 |
| Pre-procedural 3D-angiogram radiation (cGycm2) | 1188 ± 262 | 1449 ± 452 | 0.41 |
| Post-procedural 3D-angiogram radiation (cGycm2) | 1313 ± 333 | 1491 ± 439 | 0.57 |
| Radiation dose CRT only (cGycm2) | 5753 ± 3038 | 5303 ± 5847 | 0.91 |
| LV lead electrical properties | |||
| Paced QRS duration (ms) | 153 ± 22 | 170 ± 22 | 0.18 |
| Decrease QRS duration (ms) | − 12 ± 13 | − 9 ± 27 | 0.10 |
| Pacing threshold (V) | 0.65 ± 0.39 | 0.58 ± 0.20 | 0.64 |
| QLV (ms) | 150 ± 8 | 130 ± 30 | 0.23 |
| Ratio QLV/QRS (%) | 85 ± 10 | 81 ± 16 | 0.66 |
| Echocardiographic follow up | |||
| LV end-systolic volume change (%) | − 30 ± 10 | − 19 ± 19 | 0.28 |
| LV ejection fraction change from baseline (%) | 15 ± 5 | 10 ± 12 | 0.30 |
Values are in mean ± SD, median [interquartile range]
LV left ventricular, QLV interval from Q on the surface ECG to local sensing at the LV electrogram