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Table 2 Arterial blood gas values and ventilation during the minimal-distention (low PEEP) and high-recruitment (high PEEP) periods

From: Accuracy and precision of end-expiratory lung-volume measurements by automated nitrogen washout/washin technique in patients with acute respiratory distress syndrome

 

Low PEEP

High PEEP

p value

pH

7.37 (7.32; 7.44)

7.36 (7.30; 7.41)

0.014

PaO2/FiO2

135 (106; 175)

174 (122; 220)

< 0.0001

SaO2 (%)

95 (93; 97)

97 (95; 99)

0.0001

PaCO2 (mm Hg)

41 (36; 46)

42 (36; 48)

0.1

PEEPtot (cm H2O)

6 (5; 6)

15 (13; 17)

< 0.0001

Pplat (cm H2O)

18 (16; 22)

29 (29; 31)

< 0.0001

Cstat (ml/cm H2O)

33.3 (25.0; 39.9)

28.6 (23.9; 33.8)

0.003

Clin (ml/cm H2O)

36.0 (26.0; 42.7)

30.0 (24.8; 34.5)

< 0.0001

EELV (ml)

908 (693; 1,180)

1573 (1,025; 1,905)

< 0.0001

PEEP-volume (ml)

186 (120; 261)

815 (473; 1,122)

< 0.0001

  1. Cstat, static compliance computed as tidal volume/(Pplat at low PEEP-low PEEP); Clin, linear compliance measured on the linear part of the pressure-volume curve; values of p for the comparison were calculated for low PEEP versus high PEEP; values are expressed as median (interquartile range).