Table 2 Comparison of pulmonary artery wedge and mixed venous blood in pulmonary arterial hypertension patients (n = 63)

pH

7.53 ± 0.08

7.40 ± 0.03

0.13

0.11 to 0.15

<0.001

pCO₂ (mmHg)

27.1 ± 8.2

41.9 ± 5.7

− 14.80

−16.42 to − 13.10

<0.001

pO₂ (mmHg)

104.4 ± 53.5

39.6 ± 4.7

64.85

51.40 to 78.30

<0.001

pO₂ ^a (mmHg)

82.5 ± 24.9

40.1 ± 4.8

42.48

38.01 to 50.96

<0.001

HCO₃- (mmoL/L)

22.3 ± 4.0

25.7 ± 3.3

−3.39

− 3.83 to − 2.96

<0.001

O₂Hb (%)

93.6 ± 5.4

68.3 ± 7.3

25.28

22.95 to 27.61

<0.001

O₂Hb ^a (%)

92.7 ± 6.5

70.5 ± 6.3

22.20

19.11 to 25.28

<0.001

COHb (%)

1.76 ± 1.18

1.59 ± 1.1

0.16

0.06 to 0.26

0.002

COHb ^b (%)

1.52 ± 0.79

1.33 ± 0.61

0.16

0.07 to 0.24

<0.001

metHb (%)

0.83 ± 0.43

0.95 ± 0.50

− 0.12

− 0.23 to − 0.01

0.03

Hb (g/dL)

12.7 ± 2.4

12.8 ± 2.3

− 0.11

− 0.29 to + 0.07

0.24

Lactate (mmoL/L)

0.94 ± 0.35

0.82 ± 0.36

0.12

0.08 to 0.15

<0.001