Table 1: Arterial blood gas results.
| Values | Baseline (last admission) | Prior to NIV | On BIPAP (1 hour) |
| FiO2 and flow/min | 24% on 2 l | 28% on 4 l | 48%, 20/4 (IPAP/EPAP) |
| H+ | 45.5 | 47.9 | 47.3 |
| PaCO2 | 8.50 | 9.00 | 8.12 |
| PaO2 | 8.55 | 7.35 | 8.62 |
| HCO3- | 32.9 | 34 | 34 |
| CoHb (0.5-2.5%) | 0.5 | 10.0 | 8.0 |