Table 2. Polysomnogram characteristics.
| Total (N=16) | Obstructive Apnea (N=8) | Central Apnea (N=8) | p | |
|---|---|---|---|---|
| Sleep efficiency, % | 70.8±11.1 | 70.3±11.3 | 71.4±11.7 | 0.846 |
| Arousal index/hour | 32.7±16.1 | 31.5±16.1 | 34.0±17.2 | 0.763 |
| AHI, number/hour | 45.5±21.6 | 31.7±17.6 | 59.3±16.1 | 0.006 |
| AHI REM, number/hour | 31.8±30.8 | 22.2±34.7 | 41.5±24.9 | 0.223 |
| AHI nREM, number/hora | 47.1±24.9 | 31.0±19.6 | 63.2±18.8 | 0.005 |
| AHI supine | 46.3±26.8 | 32.5±27.3 | 60.1±19.0 | 0.034 |
| AHI lateral | 38.1±21.2 | 34.4±18.0 | 41.7±24.8 | 0.510 |
| CAI, number/hour | 25.9±22.7 | 7.4±8.9 | 44.4±15.7 | <0.001 |
| %CA | 45.5±32.2 | 17.5±16.1 | 73.6±12.8 | <0.001 |
| CAI REM, number/hour (N=9) | 7.4±10.0 | 0.3±0.5 | 11.0±10.7 | 0.057 |
| CAI nREM, number/hour (N=9) | 40.3±27.6 | 10.0±2.0 | 55.5±19.8 | 0.006 |
| Cheyne-Stokes Respiration | 7 (43.8) | 1 (12.5%) | 6 (75.0%) | 0.041 |
| OAI, number/hour | 4.6±4.1 | 5.6±4.4 | 3.6±3.8 | 0.331 |
| MAI, number/hour | 3.6±3.4 | 3.3±3.4 | 4.0±3.6 | 0.727 |
| HI, number/hour | 11.4±7.1 | 15.4±7.4 | 7.4±4.0 | 0.018 |
| T90, % | 74.2±28.3 | 71.6±36.0 | 76.8±20.2 | 0.157 |
| ODI | 53.5±26.5 | 44.3±31.9 | 64.1±14.4 | 0.157 |
| SpO2 wakefulness, % | 87.8±4.1 | 87.3±5.5 | 88.4±2.3 | 0.601 |
| SpO2 events, % | 80.6±5.5 | 81.0±7.6 | 80.3±2.4 | 0.794 |
Values as mean ± DE o N (%)
AHI: Apnea hypopnea index; CAI: Central apnea index;OAI: Obstructive apnea index;
HI: Hypopneas index; SpO2: Oxygen saturation; ODI: oxygen desaturation index.
p=differences between obstructive and central apnea.