Table 2 Changes in respiratory mechanics and gas exchange at 5 and 15 cmH₂O of PEEP in patients divided according to the radiological pattern

Δ_15–5 End-inspiratory airway pressure (cmH₂O)

10 [8 to 11]

8 [7 to 11]

Δ_15–5 Driving pressure (cmH₂O)

0 [− 1 to 2]

− 1 [− 2 to 1]

Δ_15–5 Respiratory system elastance (cmH₂O/L)

1 [− 2 to 5]

− 1[− 4 to 2]

Δ_15–5 Lung elastance (cmH₂O/L)

1 [− 2 to 2]

− 1 [− 5 to 3]

Δ_15–5 Chest Wall elastance (cmH₂O/L)

1 ± 4

0 ± 3

Δ_15–5 PaCO₂ (mmHg)

0 [− 1 to 2]

0 [− 2 to 2]

Δ_15–5 PaO₂/FiO₂

31 [3 to 49]

62 [31 to 106]

Δ_15–5 Physiological dead space

0.02 ± 0.04

0.00 ± 0.04