Table 1 Patient characteristics at inclusion

Age (years)

70 (68–80)

Sex M/F

7/4

Body mass index (kg.m^-2)

25.4 (22–30)

 COPD

6 (55%)

 Obesity

5 (45%)

 Bronchiectasis

1 (9%)

 LV dysfunction

1 (9%)

Interstitial pulmonary disease

1 (9%)

APACHE III

20 (17–23.5)

SOFA score total at inclusion

5 (3.5–8)

 respiratory

2 (1.5–3)

 cardiovascular

1 (0–2)

 neurologic

0.5 (0–1)

 hepatic

0 (0–0)

 hematologic

0 (0–1)

 renal

1 (0–1.5)

ICU admission diagnosis

Acute respiratory failure 5 (45%)

Stroke 2 (18%)

Postoperative 1 (9%)

Gastrointestinal bleeding 1 (9%)

Cardiac arrest 1 (9%)

Trauma 1 (9%)

Days from ICU admission

9 (2–15)

Days from initiation of mechanical ventilation

4 (1–13)

pH

7.36 (7.32–7.39)

PaO₂ (mmHg)

102.5 (83–133)

FiO₂

0.5 (0.4–0.5)

PaO₂/FiO₂ (mmHg)

205 (165–338)

PaCO₂ (mmHg)

47 (37.5–51.5)

HCO₃- (mmHg)

29 (22.5–30.5)