Table 3.
Respiratory function during wakefulness between patients with obstructive sleep apnea syndrome (OSAS) and patients with overlap syndrome (OS).
| OSAS Patients n = 163 |
Overlap Syndrome Patients n = 163 |
p | |
|---|---|---|---|
| FEV1 (% predicted) | 97.8 (86.8–110) | 68.1 (51.4–79.3) | <0.001 |
| FVC (% predicted) | 87.9 (77–100) | 73.3 (57.9–89) | <0.001 |
| FEV1/FVC (%) | 85.8 (82.2–90.4) | 67.2 (62.3–69.2) | <0.001 |
| Airflow limitation | |||
| Mild (%) | - | 24.5% | - |
| Moderate (%) | - | 57.7% | - |
| Severe (%) | - | 17.8% | - |
| pH | 7.42 (7.40–7.44) | 7.42 (7.41–7.44) | 0.827 |
| pO2 (mmHg) | 77 (70–83.2) | 71.6 (64–79.5) | <0.001 |
| pCO2 (mmHg) | 41 (39–44) | 43 (39–44) | 0.040 |
Abbreviations: FEV1: forced expiratory volume in the first second; FVC: forced vital capacity; pCO2: partial carbon dioxide pressure; pO2: partial oxygen pressure.