TABLE 3.
Arterial blood gases and exhaled alveolar gas measurements
| Acute (n=30)# | Recovered (n=17) | Healthy (n=13) | |
| pH | 7.48±0.04 (7.42–7.60) | 7.44±0.03 (7.39–7.51) | 7.43±0.02 (7.41–7.49) |
| PaCO2 (mmHg) | 34.8±4.2 (26.5–43.0) | 34.4±3.7 (26.7–40.6) | 37.0±2.8 (31.4–40.8) |
| PaO2 (mmHg) | 68.3±12.6 (52.3–105.8) | 100.6±13.6 (84.0–131.3) | 105.0±8.3 (94.5–120.0) |
| PAO2 (mmHg) | 113.3±5.7 (102.2–122.3) | 113.6±6.3 (100.2–125.3) | 119.5±5.1 (112.7–127.3) |
| PACO2 (mmHg) | 30.3±4.0 (23.4–37.3) | 31.4±3.1 (24.9–38.7) | 35.2±2.9 (29.1–39.9) |
| PA−aO2 (mmHg) | 41.4±16.3 (−3.5–69.3) | 13.0±9.7 (−6.0–30.2) | 6.5±6.9 (−5.8–21.4) |
| Pa−ACO2 (mmHg) | 6.0±4.2 (−2.3–13.4) | 3.0±2.3 (−2.2–8.9) | 1.8±1.9 (−1.4–6.0) |
| SaO2 (%) | 94.3±0.2 (89.4–98.7) | 98.7±0.5 (97.7–99.5) | 98.9±0.2 (98.4–99.3) |
Data are presented as mean±sd (range). #: all acute patient gas partial pressures are expressed at body temperature. PaCO2: arterial partial pressure of carbon dioxide; PaO2: arterial partial pressure of oxygen; PAO2: alveolar partial pressure of oxygen; PACO2: alveolar partial pressure of carbon dioxide; PA−aO2: alveolar–arterial partial pressure difference for oxygen; Pa−ACO2: alveolar–arterial partial pressure difference for carbon dioxide; SaO2: arterial oxygen saturation.