Table 2.
Baseline tissue oxygen saturation, deoxygenation and reoxygenation rates between sites and between probe sizes
| Probe | Thenar eminence | Coefficient of variability (%) | Forearm | Coefficient of variability (%) | P valuea |
|---|---|---|---|---|---|
| 15 mm | |||||
| Absolute StO2 (%) | 90.4 (85.2, 93.5), 76.6 to 95.3b | 5.6 | 85.2 (80.7, 90.2), 65.8 to 93.6b | 7.8 | 0.031 |
| DeO2 (%O2/minute) | -12.8 (-16.2, -11.3) | 26.1 | -8.5 (-10.3, -7.8) | 42.7 | 0.011 |
| ReO2 (%O2/minute) |
297.2 (213.7, 328.6) | 21.5 | 98.6 (53.7, 157.8) | 68.4 | < 0.0001 |
| 25 mm | |||||
| Absolute StO2 (%) | 92.7 (89.4, 94.7), 81.9 to 95.9b | 4.6 | 87.3 (81.7, 90.9), 76.0 to 95.2b | 6.7 | 0.016 |
| DeO2 (%O2/minute) |
-18.0 (-24.1, -14.8) | 36.5 | -9.9 (-15.3, -6.5) | 53.6 | < 0.0001 |
| ReO2 (%O2/minute) | 401.6 (331.7, 543.2) | 28.2 | 160.5 (132.3, 366.9) | 66.8 | 0.012 |
| Comparison of 15 mm vs. 25 mm probe (P value) | |||||
| StO2 | 0.020 | ||||
| DeO2 | < 0.0001 | ||||
| ReO2 | < 0.0001 | ||||
Baseline tissue oxygen saturation (StO2), deoxygenation rate (DeO2) and reoxygenation rate (ReO2) between the thenar eminence versus forearm and between the 15 mm probe versus 25 mm probe. Data presented as the median (interquartile range). aThenar eminence versus forearm comparison. bAbsolute StO2 range.