Table 1 Main characteristics of patients (n = 56)

Age (years)

57 ± 13

54 ± 14

60 ± 11

Sex, M/F (n)

21/35

16/27

5/8

Height (cm)

168 ± 9

169 ± 9

169 ± 11

Weight (kg)

72 ± 15

73 ± 15

67 ± 16

Ideal body weight (kg)

62 ± 10

62 ± 9

63 ± 11

Tidal volume (ml)

455 ± 66

441 ± 55

500 ± 79

Tidal volume (ml/kg of ideal body weight)

7.4 ± 0.8

7.2 ± 0.7

8.0 ± 0.7

Respiratory rate (cycles/min)

13 ± 1

13 ± 1

12 ± 1

Positive end-expiratory pressure (cmH₂O)

5 [5–6]

5 [5–6]

6 [5–8]

F_IO₂ (%)

45 [40–50]

45 [40–50]

45 [40–45]

Driving pressure (cmH₂O)

11 ± 3

11 ± 3

8 ± 2

ASA status I/II/III

7/16/33

5/9/29

2/7/4

Surgery (n)

 Neurosurgery

43

43

0

 Abdominal surgery

13

0

13

Comorbidities

 Arterial hypertension

17

16

1

 Smoking

5

4

1

 Diabetes

4

4

0

 Stroke

2

2

0

Medications

 ACE inhibitors

9

7

2

 Statins

5

5

0

 Calcium blockers

5

4

1

 ARB

5

4

1

 Antidiabetic drug

3

3

0

 Beta-blockers

2

2

0