Table 3.
R-wave amplitudes and noise burden (Home Monitoring Service Center data)
| R wave and noise by ICM position | N= | Mean ± SD | Median (IQR) |
|---|---|---|---|
| R-wave amplitude, mV | |||
| All insertion positions | 621 | 0.73 ± 0.40 | 0.60 (0.42–0.97) |
| Parallel to the heart's long axis† | 339 | 0.80 ± 0.43 | 0.71 (0.46–1.09) |
| Parasternal position† | 259 | 0.62 ± 0.34 | 0.53 (0.38–0.77) |
| Noise burden, minutes/day | |||
| All insertion positions | 621 | 43.3 ± 102.4 | 9.4 (0.3–36.4) |
| Parallel to the heart's long axis‡ | 339 | 36.3 ± 102.7 | 3.7 (0.0–26.8) |
| Parasternal position‡ | 259 | 53.3 ± 104.8 | 14.5 (3.5–49.1) |
| R-wave amplitude stability: SD/mean, % | 621 | 8.6 ± 6.5 | 7.0 (5.1–9.6) |
ICM = insertable cardiac monitor; IQR = interquartile range; SD, standard deviation.
†
P < .001 (t test) and
‡
P < .001 (Mann–Whitney U test).