Table 2 Ventilatory measurements at baseline and during conventional ventilation and open lung ventilation

Intrinsic + extrinsic positive end-expiratory pressure (cmH₂O)

5 ± 0.4

6 ± 0.3

14 ± 0.6^*,**

Peak inspiratory airway pressure (cmH₂O)

20 ± 0.5

28 ± 1^**

26 ± 0.4^**

Tidal volume (ml)

271 ± 5

270 ± 6

240 ± 11^*,**

PaO₂/FiO₂ (kPa)

60 ± 5

13 ± 2

72 ± 2^*

-1000 HU to -600 HU (%)

51 ± 3

10 ± 2^**

29 ± 3^*,**

-600 HU to -200 HU (%)

29 ± 2

36 ± 2

57 ± 3^*,**

-200 HU to +200 HU (%)

20 ± 2

52 ± 3^**

13 ± 2^*