Table 2.
Variables of arterial blood gas analyses during different time periods
| Variable | T1 | T2 | T3 |
|---|---|---|---|
| Pre | Hyperoxia | Post | |
| FiO2 (%) | 25 (21–30) | 90 (90–90) | 21 (21–25) |
| Arterial blood gas analysesa | |||
| SaO2 (%) | 94.9 (1.9) | 99.0 (0.3)*** | 95.7 (1.8) |
| PaO2 (mmHg) | 83.5 (12.2) | 390.2 (93.2)*** | 87.8 (21.5) |
| PaCO2 (mmHg) | 39.8 (8.1) | 36.0 (7.9)** | 34.5 (8.7)*** |
| Hb (mmol L−1) | 7.2 (0.8) | 7.4 (0.7) | 7.4 (0.8) |
| Ht (L L−1) | 0.34 (0.04) | 0.35 (0.03) | 0.35 (0.04) |
| Glucose (mmol L−1) | 7.5 (1.6) | 7.4 (1.7) | 7.7 (1.8) |
| Lactate (mmol L−1) | 1.25 (0.38) | 1.20 (0.40) | 1.25 (0.34) |
Data are means (SD). For FiO2, medians (interquartile range) are provided
FiO 2 fraction of inspired oxygen, SaO 2 arterial oxygen saturation, PaO 2 partial pressure of arterial oxygen, PaCO 2 partial pressure of arterial carbon dioxide, Hb hemoglobin, Ht hematocrit
* P < 0.01; ** P < 0.001; *** P < 0.0001 for paired comparison between indicated outcome and baseline (T1)
aArterial blood gas samples analyzed prior to the start of hemodynamic measurement