Pacing, sensing characteristics, and impedance at implantation and follow up
| Group A: children weighing ≤15 kg | Group B: children weighing >15 kg | |||||
|---|---|---|---|---|---|---|
| Endocardial lead | Epicardial lead | p Value | Endocardial lead | Epicardial lead | p Value | |
| Data are mean (SD) or n. | ||||||
| –, no statistical analysis possible because of small number of measurements. | ||||||
| Atrial leads | ||||||
| Acute (n) | 5 | 3 | 51 | 9 | ||
| Stimulation threshold (V) | 0.92 (0.57) | 1.13 (0.09) | – | 0.73 (0.33) | 0.90 (0.40) | >0.10 |
| Impedance (ohm) | 639 (148) | 552 (129) | – | 563 (163) | 615 (142) | >0.10 |
| Sensing threshold (mV) | 2.9 (1.1) | 4.5 (1.6) | – | 3.4 (1.6) | 3.0 (1.6) | >0.10 |
| Chronic (n) | 4 | 2 | 19 | 9 | ||
| Stimulation threshold (V) | 0.57 (0.11) | 0.85 (0.35) | – | 0.74 (0.35) | 0.91 (0.53) | >0.10 |
| Impedance (ohm) | 626 (136) | 609 (152) | – | 612 (189) | 591 (116) | >0.10 |
| Sensing threshold (mV) | 3.0 (1.8) | 3.9 (1.5) | – | 3.1 (1.5) | 3.9 (2.0) | >0.10 |
| Ventricular leads | ||||||
| Acute (n) | 9 | 13 | 55 | 11 | ||
| Stimulation threshold (V) | 0.84 (0.54) | 1.59 (0.64) | <0.014 | 0.72 (0.48) | 1.48 (0.58) | <0.001 |
| Impedance (ohm) | 697 (162) | 610 (180) | >0.10 | 656 (183) | 683 (197) | >0.10 |
| Sensing threshold (mV) | 9.7 (4.9) | 12.8 (7.2) | >0.10 | 9.1 (6.2) | 12.6 (7.4) | >0.10 |
| Chronic (n) | 7 | 8 | 24 | 10 | ||
| Stimulation threshold (V) | 0.64 (0.24) | 1.65 (0.69) | <0.003 | 0.88 (0.46) | 1.55 (0.96) | <0.009 |
| Impedance (ohm) | 716 (282) | 548 (225) | >0.10 | 633 (183) | 625 (178) | >0.10 |
| Sensing threshold (mV) | 9.6 (1.9) | 9.6 (3.3) | >0.10 | 9.1 (5.2) | 14.2 (6.4) | <0.02 |