| PS15 | PS5 | PS0 | P |
---|---|---|---|---|
Tidal volume, ml | 836 ± 250 | 496 ± 210 | 456 ± 182 | <0.001 |
Respiratory rate, min−1 | 10.7 ± 4.3 | 16.0 ± 6.8 | 16.7 ± 7.6 | 0.003 |
Minute ventilation, l/min | 8.2 ± 2.1 | 7.4 ± 2.5 | 6.8 ± 2.1 | 0.119 |
Mean airway pressure, cmH2 O | 11.8 ± 2.9 | 8.7 ± 2.0 | 7.6 ± 1.9 | <0.001 |
Mean arterial pressure, mmHg | 77.9 ± 8.8 | 78.8 ± 10.6 | 80.2 ± 11.4 | 0.751 |
Heart rate, min−1 | 63.9 ± 19.1 | 65.7 ± 19.4 | 66.5 ± 21.0 | 0.899 |
pH | 7.39 ± 0.05 | 7.37 ± 0.04 | 7.36 ± 0.04 | 0.090 |
PaO2 , mmHg | 176.7 ± 48.3 | 179.3 ± 50.0 | 175.2 ± 61.9 | 0.967 |
PaCO2 , mmHg | 42.2 ± 5.3 | 43.8 ± 4.4 | 45.1 ± 5.1 | 0.147 |
Base excess, mmol/L | 1.0 ± 2.9 | 0.7 ± 2.9 | 0.6 ± 3.0 | 0.899 |