Variables | PEEPlow responders (n = 15) | PEEPlow non-responders (n = 12) | p value PEEPlow | PEEPhigh responders (n = 15) | PEEPhigh non-responders (n = 12) | p value PEEPhigh |
---|---|---|---|---|---|---|
Gas exchange | ||||||
FiO2 | 0.62 ± 0.13 | 0.64 ± 0.13 | 0.69 | 0.62 ± 0.13 | 0.64 ± 0.13 | 0.69 |
PaO2 (mm Hg) | 75 ± 18 | 81 ± 25 | 0.68 | 109 ± 21* | 86 ± 25 | < 0.001 |
PaO2/FiO2 ratio (mm Hg) | 127 ± 41 | 138 ± 42 | 0.95 | 182 ± 41* | 129 ± 58 | 0.02 |
PaCO2 (mm Hg) | 65 ± 15 | 68 ± 16 | 0.83 | 66 ± 14 | 70 ± 10 | 0.98 |
ET-CO2 (mm Hg) | 42 ± 11 | 45 ± 10 | 0.91 | 45 ± 12 | 49 ± 11 | 0.75 |
pH | 7.27 ± 0.11 | 7.28 ± 0.09 | 0.98 | 7.26 ± 0.11 | 7.26 ± 0.09 | 0.99 |
BE (mmol/L) | 1.2 ± 5.9 | 1.6 ± 4.2 | 0.89 | 1.0 ± 5.9 | 1.3 ± 4.4 | 0.91 |
Pulmonary mechanics | ||||||
Vt (mL/PBW kg) | 6.5 ± 1.2 | 5.5 ± 2.7 | 0.39 | 6.5 ± 1.2 | 5.5 ± 2.7 | 0.58 |
RR (breaths/min) | 19 ± 3.0 | 19 ± 2.2 | 0.99 | 19 ± 3.0 | 19 ± 2.2 | 0.99 |
Pplat (cm H20) | 27 ± 2.8 | 29 ± 2.7 | 0.78 | 34 ± 6.1* | 38 ± 4.0* | 0.01 |
PEEP (cm H2O) | 11 ± 2.7 | 12 ± 3.2 | 0.58 | 18 ± 3.0* | 18 ± 3.1* | 0.99 |
Pdr (cm H2O) | 15 ± 2.4 | 16 ± 1.8 | 0.78 | 9.5 ± 3.8* | 17 ± 3.8 | < 0.001 |
Crs (mL/cm H2O) | 27 ± 5 | 28 ± 9 | 0.70 | 34 ± 6* | 25 ± 7 | < 0.01 |