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Table 3 Levels of positive end-expiratory pressure achieved and corresponding levels of gastric mucosal pH, and partial tissue and arterial carbon dioxide tension gap

From: Gastric intramucosal pH is stable during titration of positive end-expiratory pressure to improve oxygenation in acute respiratory distress syndrome

    pHi P(t-a)CO2
Patient number PEEPopt (cmH2O) PEEPmax (cmH2O) At PEEPbaseline At PEEPopt At PEEPmax At PEEPbaseline At PEEPopt At PEEPmax
1 7 9 7.46 7.4 7.4 -1.7 -1 -3.5
2 13 15 7.45 7.43 7.33 -1.7 6.7 17.5
3 17 17 7.26 7.28 7.28 3 -2 -2
4 5 15 7.19 7.19 7.16 10.2 8 13
5 7 11 7.45 7.37 7.32 -3.4 3.4 11
6 15 15 7.23 7.05 7.05 -0.7 11.6 12.6
7 7 15 7.24 7.26 7.23 1.5 0.9 16.1
8 9 13 7.18 7.18 7.24 11.2 14 10.8
9 17 17 7.45 7.44 7.44 -1 10 5
10 15 17 7.15 7.23 7.2 4.6 10.5 13.2
11 11 15 7.45 7.42 7.29 -4.7 5 8.9
12 13 15 7.50 7.43 7.46 -0.3 8 -3.6
13 13 13 7.27 7.46 7.46 -3.5 1 7.3
14 5 9 7.36 7.36 7.27 3.4 3.8 7.4
15 7 9 7.38 7.37 7.37 2.1 13 16
16 5 13 7.14 7.14 7.08 7 -3.8 -2.6
17 9 9 7.15 7.46 7.46 26.6 0.5 -1
  1. Positive end-expiratory pressure (PEEP) at baseline was 5 cmH2O. pHi, gastric mucosal pH; P(t-a)CO2, gap between partial tissue and arterial carbon dioxide tension.