Table 1 Demographic and respiratory parameters of patients included in the study

Age (yr)

55.8 ± 8.8 (34–66)

Male (%)

10 (66)

Body mass index (kg/m²)

28 ± 7 (17–40)

Obesity (%)

6 (40)

Diagnosis:

 ARDS SARS-CoV-2 (%)

6 (40)

 Neurological injury (intracerebral hemorrhage, stroke, post-anoxic) (%)

6 (40)

 Non-ARDS pulmonary injury (COPD, pneumonia) (%)

3 (20)

Extracorporeal membrane oxygenation (%)

2 (13)

SAPS III

60 ± 11 (45–84)

Parameters in volume-controlled mode (n = 15):

 Tidal volume (ml/kg predicted body weight)

6.1 ± 1.3 (2.7–7.4)

 Plateau pressure (cmH₂O)

19 ± 4 (12–25)

 PEEP (cmH₂O)

7 ± 3 (5–10)

 Respiratory rate (min⁻¹)

19 ± 5 (15–34)

 PaO₂/FiO₂ (mmHg)

172 ± 88 (63–380)

 PaCO₂ (cmH₂O)

52 ± 15 (34–92)

 Respiratory system elastance (cmH₂O/(ml/kg))

1.8 ± 1.2 (0.9–5.5)

Parameters in pressure support (n = 13):

 PEEP (cmH₂O)

5 ± 1 (5–10)

 Inspiratory pressure (cmH₂O)

8 ± 3 (2–12)

 Respiratory rate (min⁻¹)

18 ± 4 (13–25)

 PaO₂/FiO₂ (%)

184 ± 53 (81–267)

 PaCO₂ (mmHg)

46 ± 10 (34–67)