| Lower Crs N = 16 | Higher Crs N = 24 | P Crs | P Phase | P Crs*Phase |
---|---|---|---|---|---|
pH |  |  |  < 0.0001 |  < 0.0001 |  < 0.0001 |
Supine | 7.33 ± 0.02# | 7.38 ± 0.02 |  |  |  |
Supine + weight | 7.34 ± 0.02# | 7.38 ± 0.02 |  |  |  |
Prone | 7.34 ± 0.02# | 7.39 ± 0.02 |  |  |  |
Prone + weight | 7.35 ± 0.02°# | 7.39 ± 0.02 |  |  |  |
PaO2 (mmHg) |  |  | 0.0425 |  < 0.0001 |  < 0.0001 |
Supine | 67.9 ± 5.5 | 69.6 ± 3.8 |  |  |  |
Supine + weight | 76.1 ± 6.8°# | 62.3 ± 2.4 |  |  |  |
Prone | 91.8 ± 9.4°*# | 107 ± 15.2°* |  |  |  |
Prone + weight | 100 ± 12.2°*§# | 87.1 ± 9.5°* |  |  |  |
PaCO2 (mmHg) |  |  |  < 0.0001 |  < 0.0001 |  < 0.0001 |
Supine | 57.6 ± 4.10# | 43.0 ± 2.88 |  |  |  |
Supine + weight | 56 ± 4.20# | 43.8 ± 2.98 |  |  |  |
Prone | 55.8 ± 4.07°# | 42.4 ± 3.12 |  |  |  |
Prone + weight | 55 ± 4.53°# | 43.5 ± 3.04 |  |  |  |
PaO2/FiO2 (mmHg) |  |  |  < 0.0001 |  < 0.0001 |  < 0.0001 |
Supine | 107 ± 15.4# | 129 ± 15.3 |  |  |  |
Supine + weight | 120 ± 18.5° | 116 ± 13.1 |  |  |  |
Prone | 146 ± 27.0°*# | 198 ± 34.9°* |  |  |  |
Prone + weight | 159 ± 30.4°*§ | 162 ± 25.1°* |  |  |  |
EtCO2 (mmHg) |  |  |  < 0.0001 |  < 0.0001 |  < 0.0001 |
Supine | 42.4 ± 2.58# | 36.9 ± 1.65 |  |  |  |
Supine + weight | 43.1 ± 2.78# | 36.7 ± 1.58 |  |  |  |
Prone | 43.4 ± 2.92# | 36.8 ± 1.76 |  |  |  |
Prone + weight | 44.1 ± 2.98°# | 36.5 ± 1.61 |  |  |  |
Ventilatory ratio |  |  |  < 0.0001 |  < 0.0001 |  < 0.0001 |
Supine | 2.12 ± 0.28# | 1.45 ± 0.22 |  |  |  |
Supine + weight | 2.07 ± 0.27°# | 1.48 ± 0.23 |  |  |  |
Prone | 2.06 ± 0.28°# | 1.43 ± 0.23 |  |  |  |
Prone + weight | 2.03 ± 0.27°*§# | 1.47 ± 0.22 |  |  |  |
Alveolar dead space (%) |  |  |  < 0.0001 |  < 0.0001 |  < 0.0001 |
Supine | 26.4 ± 2.45# | 14.1 ± 3.13 |  |  |  |
Supine + weight | 22.9 ± 3.10°# | 16.2 ± 3.27 |  |  |  |
Prone | 21.9 ± 3.51°# | 16.9 ± 1.14 |  |  |  |
Prone + weight | 19.8 ± 4.34°*§# | 15.8 ± 3.68 |  |  |  |
Airway plateau pressure (cmH2O) |  |  |  < 0.0001 |  < 0.0001 |  < 0.0001 |
Supine | 27.1 ± 1.8# | 17.4 ± 1.2 |  |  |  |
Supine + weight | 23.4 ± 2.2°# | 20.6 ± 1.1° |  |  |  |
Prone | 23.3 ± 2.1°# | 16.9 ± 1.1* |  |  |  |
Prone + weight | 21.4 ± 2.8°*§# | 19.9 ± 1.1§ |  |  |  |
Airway driving pressure (cmH2O) |  |  |  < 0.0001 |  < 0.0001 |  < 0.0001 |
Supine | 16.8 ± 1.8# | 8.67 ± 1.3 |  |  |  |
Supine + weight | 13.2 ± 2.4°# | 11.9 ± 1.0° |  |  |  |
Prone | 13.1 ± 2.4°# | 8.17 ± 1.2* |  |  |  |
Prone + weight | 11.1 ± 3.3°*§# | 11.1 ± 1.2§ |  |  |  |
Respiratory system compliance (ml/cmH2O) |  |  |  < 0.0001 |  < 0.0001 |  < 0.0001 |
Supine | 23.9 ± 3.56# | 64.8 ± 10.0 |  |  |  |
Supine + weight | 30.9 ± 5.7°# | 46.8 ± 4.8° |  |  |  |
Prone | 31.1 ± 5.7°# | 68.9 ± 11.4* |  |  |  |
Prone + weight | 37.8 ± 8.7°*§# | 50.0 ± 6.2§ |  |  |  |