Table 1.
Prone-supine differences in perfusion index, instantaneous pulse oximeter heart rate (HR-P); RR-interval heart rate (HR-M); oxygen saturation (SpO2); flank, forearm, leg and environment temperatures; and central-to-peripheral (flank-to-forearm and flank-to-leg) temperature gradients (mean ± SD)
| Variables | Quiet sleep
|
Active sleep
|
||||
|---|---|---|---|---|---|---|
| Prone | Supine | p | Prone | Supine | p | |
| Perfusion index | 3.7 ± 0.9 | 3.1 ± 0.7 | <0.0005 | 2.9 ± 0.9 | 2.3 ± 0.9 | <0.0001 |
| HR-P (bpm) | 157.0 ± 7.9 | 153.1 ± 9.1 | <0.0001 | 162.5 ± 9.5 | 159.5 ± 8.1 | <0.001 |
| HR-M (bpm) | 158.4 ± 8.9 | 154.1 ± 8.8 | <0.005 | 162.7 ± 9.5 | 160.2 ± 7.7 | 0.007 |
| SpO2 (%) | 95.8 ± 2.6 | 95.2 ± 2.6 | <0.03 | 94.8 ± 2.4 | 94.2 ± 2.5 | <0.02 |
| Flank temperature (°C) | 36.7 ± 0.4 | 36.5 ± 0.4 | <0.05 | 36.6 ± 0.3 | 36.5 ± 0.4 | NS |
| Forearm temperature (°C) | 36.1 ± 0.6 | 35.5 ± 0.4 | <0.0001 | 35.9 ± 0.3 | 35.4 ± 0.5 | <0.0001 |
| Leg temperature (°C) | 35.4 ± 0.7 | 34.7 ± 0.7 | <0.001 | 35.2 ± 0.4 | 34.6 ± 0.7 | <0.0001 |
| Environment temperature (°C) | 27.1 ± 1.0 | 27.2 ± 0.9 | NS | 27.1 ± 1.1 | 27.2 ± 1.0 | NS |
| Flank-to-forearm gradient (°C) | 0.6 ± 0.4 | 0.9 ± 0.3 | <0.005 | 0.7 ± 0.3 | 1.0 ± 0.4 | <0.005 |
| Flank-to-leg gradient (°C) | 1.3 ± 0.6 | 1.8 ± 0.7 | <0.005 | 1.4 ± 0.4 | 1.9 ± 0.5 | <0.0001 |