Table 2.
Gas exchange at different study times
| Before intubation | 30 seconds after intubation | 5 minutes after intubation | 30 minutes after intubation | |
|---|---|---|---|---|
| pH | ||||
| Control group (n = 20) | 7.27 ± 0.1 | 7.22 ± 0.1 | 7.22 ± 0.2 | 7.27 ± 0.1 |
| RM group (n = 20) | 7.36 ± 0.1 | 7.29 ± 0.1 | 7.29 ± 0.1 | 7.30 ± 0.1 |
| PaCO2 (mmHg) | ||||
| Control group (n = 20) | 49 ± 12 | 53 ± 10 | 52 ± 8 | 46 ± 6 |
| RM group (n = 20) | 44 ± 12 | 54 ± 15 | 51 ± 12 | 51 ± 11 |
| PaO2 (mmHg) | ||||
| Control group (n = 20) | 79 (73-87) | 89 (78-116) | 85 (74-109) | 95 (82-125) |
| RM group (n = 20) | 73 (63-92) | 71 (56-105) | 246 (128-303)*# | 171 (119-241)*# |
| SaO2 (%) | ||||
| Control group (n = 20) | 94 ± 4 | 93 ± 4 | 92 ± 5 | 96 ± 4 |
| RM group (n = 20) | 92 ± 5 | 90 ± 9 | 97 ± 3*# | 97 ± 3 |
All PaO2 values were sampled at a fraction of inspired oxygen of 1, except before intubation, when oxygen flow delivery was 10 to 15 L/min.
Data are presented as means ± standard deviation. * P < 0.05 compared with the value obtained before intubation. # P < 0.05 for a difference between groups. All data are mean ± standard deviation expect for PaO2 median (75-25).
PaCO2: partial pressure of arterial carbon dioxide; PaO2: partial pressure of arterial oxygen; RM: recruitment manœuvre; SaO2: arterial oxygen saturation.