Table 2 Dead space and its parameters in post-cardiac surgery patients and patients with acute respiratory distress syndrome calculated with different methods

PACO₂, kPa

–

–

4.3 ± 0.6

–

–

–

3.9 ± 0.8

PaCO₂, kPa

5.2 ± 0.5

5.2 ± 0.5

–

5.2 ± 0.5

6.9 ± 1.7

6.9 ± 1.7

–

6.9 ± 1.7

PeCO₂, kPa

2.7 ± 0.2

3.8 ± 0.5^a

2.6 ± 0.4

2.6 ± 0.4

2.2 ± 0.4

2.3 ± 0.7

2.1 ± 0.5

2.1 ± 0.5

V_D/V_T, %

49 ± 4

26 ± 9^b

38 ± 5^c

50 ± 4

67 ± 9

66 ± 10

45 ± 7^d

68 ± 9