Table 2 Resting arterial blood gases and RHC-derived data

Resting arterial blood gases breathing ambient room air

 pH

7.38 ± 0.03

7.37 ± 0.04

7.38 ± 0.03

0.34

 PaO₂, mmHg

62.4 ± 10.6

59.6 ± 10.0*

65.0 ± 10.6

0.03

 PaCO₂, mmHg

49.7 ± 6.0

50.8 ± 6.1

48.8 ± 5.8

0.19

 HCO3⁻

29.7 ± 3.9

30.6 ± 4.4

28.8 ± 3.1

0.06

 SaO₂, %

90 ± 5

90 ± 5

91 ± 4

0.24

Selected RHC measurements, median (IQR)

 Systolic PAP, mmHg

34.0 (28.8–40.0)

40.0 (37.0–45.0) *

29.0 (24.5–33.0)

 < 0.001

 Diastolic PAP, mmHg

17.0 (13.8–21.0)

21.0 (19.8–24.0) *

14.0 (11.0–16.0)

 < 0.001

 Mean PAP, mmHg

22.0 (19.3–27.3)

27.3 (25.6–29.4) *

19.5 (16.7–21.0)

 < 0.001

 PAWP, mmHg

6.0 (4.0–8.0)

7.0 (4.0–9.3)

6.0 (4.5–7.0)

0.12

 CO, L/min

5.25 (4.75–5.96)

5.07 (4.56–5.96)

5.46 (4.89–5.97)

0.30

 CI, L/min/m²

3.10 (2.68–3.45)

2.99 (2.56–3.35)

3.10 (2.75–3.63)

0.52

 PVR, WU

2.94 (2.32–4.32)

4.31 (3.53–5.36) *

2.39 (1.77–3.84)

 < 0.001