Table 1 Weekly medians and interquartile ranges (IQR) of electrode impedances for all USEAs. Post-hoc testing between the first and final post-implant sessions revealed a significant pairwise drop in impedance for electrodes on S4’s median-nerve USEA (p < 0.0001; two-tailed Wilcoxon’s signed-rank test, denoted with a), but did not reveal a statistically significant pairwise change for the remaining 3 USEAs (p = 0.82 S3 ulnar, p = 0.12 S3 median, p = 0.99 S4 ulnar)
USEA | Number of non-failed electrodes | Week 1 | Week 2 | Week 3 | Week 4 |
|---|---|---|---|---|---|
S3 Median Array | 41 | 96 kΩ (65 kΩ) | 81 kΩ (41 kΩ) | 89 kΩ (36 kΩ) | 99 kΩ (47 kΩ) |
S3 Ulnar Array | 81 | 171 kΩ (79 kΩ) | 141 kΩ (107 kΩ) | 110 kΩ (52 kΩ) | 188 kΩ (96 kΩ) |
S4 Median Array | 60 | 167 kΩ (117 kΩ) | 186 kΩ (70 kΩ) | 337 kΩ (71 kΩ) | 85 kΩ (69 kΩ) a |
S4 Ulnar Array | 59 | 127 kΩ (69 kΩ) | 143 kΩ (99 kΩ) | 194 kΩ (101 kΩ) | 118 kΩ (96 kΩ) |