Table 3 Blood gas analysis before surgery

pH

7.44 (7.36,7.49)

7.42 (7.36,7.5)

7.39 (6.97,7.53)

0.459

PaO₂ (mmHg)

193.5 (156,317)

198.7 (158,251)

194.2 (112,271)

0.898

PaCO₂ (mmHg)

33.81 ± 3.07

34.97 ± 8.17

37.01 ± 3.63

0.426

BE (mmol/l)

−1.07 ± 2.47

−1.66 ± 2.81

−1.83 ± 9.14

0.952

HCO₃ ⁻ (mmol/l)

22.49 ± 1.67

22.94 ± 2.9

22.45 ± 6.55

0.96

K⁺ (μmol/l)

3.37 ± 0.5

3.43 ± 0.32

3.63 ± 0.55

0.412

Na⁺ (μmol/l)

141.6 ± 2.72

141.26 ± 2.86

137.9 ± 3.6^a

0.022

Ca²⁺ (μmol/l)

1.07 ± 0.07

1.08 ± 0.38

1.11 ± 0.06

0.233

Hb (g/l)

110.1 ± 39.71

100.7 ± 41.73

95.9 ± 34.72

0.408

Hct (%)

37.1 ± 6.52

33.3 ± 8.35

29 ± 10.71

0.134