Table 2 Changes in respiratory mechanics and gas exchange at 5 and 15 cmH₂O of PEEP between high and low respiratory system compliance group

Δ_15-5 Plateau pressure, cmH₂O

10 [7–12]

11 [10–13]

Δ_15-5 Driving pressure, cmH₂O

0 [− 3 to 2]

1 [0–3]

Δ_15-5 Respiratory system elastance, cmH₂O/L

− 1 [− 5 to 4]

2 [0–6]

Δ_15-5 Lung elastance, cmH₂O/L

2 [− 2 to 5]

2 [0–5]

Δ_15-5 Chest wall elastance, cmH₂O/L

0 [− 2 to 2]

0 [− 1 to 0]

Δ_15-5 Lung stress, cmH₂O

9 [6–11]

9 [8–12]

Δ_15-5 Mechanical power, J/min

9 [8–12]

9 [8–11]

Δ_15-5 Mechanical Power_Compliance_rs, J/min/(mL/cmH₂O)

0.26 [0.12–0.40]

0.23 [0.16–0.35]

Δ_15-5 PaO₂, mmHg

20 [13–38]

20 [6–30]

Δ_15-5 PaO₂/FiO₂, mmHg

28 [16–51]

30 [10–50]

Δ_15-5 Right-to-left shunt, %

− 12 [− 23 to − 1]

− 9 [− 18 to − 5]

Δ_15-5 PvO₂, mmHg

4.0 [2.3–8.8]

2.0 [1.0–8.1]

Δ_15-5 ScvO₂, %

5.5 [1.0–10.8]

2.5 [0.0–8.1]

Δ_15-5 C_a-vO₂, mL

1.0 [0.3–1.7]

0.6 [0.2–1.3]

Δ_15-5 PaCO₂, mmHg

1 [− 1 to 3]

2 [1–4]

Δ_15-5 Ventilatory ratio

0.04 [− 0.10 to 0.10]

0.08 [0.02–0.20]

Δ_15-5 Estimated physiological dead space

0.01 [− 0.01 to 0.03]

0.02 [0.01–0.05]