Pulmonary function tests, arterial blood gas tensions and breathing pattern
| Variables | % predicted | |
|---|---|---|
| Vital capacity (ml) | 810 (123) | 19.2 (8.8) |
| Forced expiratory volume in one second (ml) | 745 (259) | 26.3 (10.0) |
| Total lung capacity (TLC) (l) | 3.02 (0.79) | 26.5 (9.3) |
| Functional residual capacity (FRC) (l) | 1.26 (0.93) | 37 (12) |
| FRC/TLC | 41.7 (8.5) | |
| Carbon monoxide transfer factor | 21.4 (10.5) | |
| pH | 7.28 (0.02) | |
| Pao 2/Fio 2 | 5.8 (0.3) | |
| Paco 2 (kPa) | 8.44 (0.82) | |
| Tidal volume (ml/kg) | 3.46 (0.24) | |
| Respiratory rate (breaths/min) | 35.1 (8.8) |
The data are presented as mean (SD). All parameters were recorded just before intubation, except pulmonary function tests which were recorded before the episode of acute respiratory failure.