Table 2.
Polysomnography parameters results.
| Total (n = 32) | Group A (n = 20) | Group B (n = 12) | P value between groups | |||||
|---|---|---|---|---|---|---|---|---|
| LP | OP | P value | LP | MFP | P value | |||
| AHI, events/h | 34.9 ± 22.6 | 39.0 ± 27.7 | 42.2 ± 32.5 | 0.279 | 28.0 ± 5.9 | 26.6 ± 9.0 | 0.301 | 0.173 |
| Non-REM, % | 34.8 ± 24.3 | 40.2 ± 29.1 | 41.5 ± 33.8 | 0.514 | 26.0 ± 8.4 | 27.0 ± 10.6 | 0.340 | 0.498 |
| REM, % | 40.8 ± 22.5 | 38.3 ± 24.6 | 44.3 ± 26.8 | 0.247 | 44.9 ± 18.9 | 35.1 ± 15.4 | 0.032 | 0.946 |
| Body position distribution desaturation at | ||||||||
| Left, % | 31.1 ± 34.2 | 28.0 ± 11.4 | 16.7 ± 8.6 | 0.001 | 68.9 ± 27.4 | 46.2 ± 29.3 | 0.013 | <0.001 |
| Right, % | 51.9 ± 43.8 | 47.2 ± 54.3 | 14.3 ± 5.1 | 0.001 | 59.8 ± 14.3 | 59.5 ± 21.3 | 0.875 | 0.934 |
| Up, % | 51.3 ± 68.4 | 67.1 ± 83.2 | 83.4 ± 88.1 | 0.274 | 25.0 ± 5.5 | 6.5 ± 3.1 | 0.005 | 0.145 |
| Averages values in HR during awakening, bpm | 77.1 ± 10.2 | 75.2 ± 12.0 | 78.5 ± 22.9 | 0.247 | 80.4 ± 4.0 | 84.6 ± 5.2 | 0.003 | 0.799 |
| Averages values in HR non-REM stage, bpm | 66.6 ± 9.3 | 68.0 ± 8.3 | 69.4 ± 7.7 | 0.305 | 64.3 ± 10.8 | 72.2 ± 4.7 | 0.003 | 0.051 |
| Averages values in HR REM stage, bpm | 72.1 ± 10.2 | 69.8 ± 11.7 | 72.1 ± 16.3 | 0.191 | 75.8 ± 6.0 | 80.3 ± 9.1 | 0.003 | 0.459 |
| Desaturation index during sleep | 34.8 ± 25.0 | 40.3 ± 29.9 | 43.7 ± 35.3 | 0.296 | 25.6 ± 8.9 | 23.3 ± 8.6 | 0.017 | 0.140 |
| Desaturation duration, min | 14.4 ± 9.9 | 16.0 ± 12.5 | 16.3 ± 12.9 | 0.747 | 11.8 ± 3.5 | 10.9 ± 3.8 | 0.054 | 0.253 |
| Averages values in SaO2 per respiratory event, % | 90.0 ± 3.8 | 89.6 ± 4.7 | 88.7 ± 4.9 | 0.038 | 90.8 ± 1.2 | 90.7 ± 1.1 | 0.011 | 0.143 |
| Minimum SaO2 per respiratory event, % | 83.0 ± 7.2 | 83.2 ± 8.7 | 81.6 ± 8.8 | 0.192 | 82.7 ± 3.7 | 84.8 ± 2.9 | 0.006 | 0.159 |
| Awakening index, n/h | 37.5 ± 24.6 | 41.5 ± 30.1 | 53.9 ± 29.8 | <0.001 | 31.0 ± 7.9 | 30.0 ± 10.0 | 0.301 | 0.031 |
| Snoring duration, min | 36.8 ± 21.2 | 33.6 ± 26.2 | 30.2 ± 17.2 | 0.911 | 42.2 ± 5.0 | 37.5 ± 3.7 | 0.002 | 0.356 |
| Snoring events | 100.3 ± 48.8 | 96.8 ± 60.6 | 94.5 ± 55.6 | 0.852 | 106.0 ± 17.8 | 55.8 ± 23.7 | 0.002 | 0.058 |
Data are expressed as mean ± standard deviation or percentages changes. AHI, apnea-hypopnea index; HR, heart rate; Left: Desaturation during sleep in left body position; LP, laboratory pillow; MFP, memory foam pillow; OP, own-pillow; REM, rapid eye movement during sleep; Right: Desaturation during sleep in right body position; Up: Desaturation during sleep in supine body position.