Table 1 Characteristics of patients. *p < 0.05 versus responder

Age (mean ± SD, years)

71 ± 14

72 ± 14

71 ± 15

Gender (male/female, no. of patients)

21/13

7/7

14/6

Patients sources

 Emergency department

12

5

7

 Surgical department

19

8

11

 Internal medicine

3

1

2

APACHE II score

19 ± 7

19 ± 5

21 ± 7

Type of shock (no. of patients)

 Septic

22

9

13

 Hypovolemic

10

5

5

 Obstructive

1

0

1

 Cardiogenic

0

0

0

 Neurogenic

1

0

1

Duration of shock prior to study inclusion (h)

13 ± 7

12 ± 7

14 ± 6

Patients receiving norepinephrine (no. of patients, %)

22 (65%)

10 (71%)

12 (60%)

Mechanical ventilation, n (%)

29 (85%)

13 (93%)

16 (80%)

Blood gas analysis

 pH

7.42 ± 0.07

7.45 ± 0.06

7.39 ± 0.07

 PaO₂ (mean ± SD, mmHg)

159 ± 43

159 ± 47

159 ± 42

 PaCO₂ (mean ± SD, mmHg)

29 ± 5

29 ± 6

29 ± 5

 Hemoglobin (mean ± SD, g/l)

9.4 ± 1.7

9.2 ± 1.7

9.5 ± 1.7

 FiO₂ (%)

48 ± 7

47 ± 5

50 ± 8

 ScvO₂ (mean ± SD, %)

82 ± 6

81 ± 5

83 ± 6

 Lactate (25–75% interquartile range, mmol/L)

1.0 (0.7–2.0)

0.9 (0.7–1.8)

0.9 (0.7–1.5)

PtcO₂ (mean ± SD, mmHg)

106 ± 38

92 ± 37

114 ± 37

PtcCO₂ (mean ± SD, mmHg)

41 ± 11

39 ± 8

42 ± 13

ICU stay (25–75% interquartile range, day)

10 (4–14)

7 (4–13)

10 (5–16)

In-hospital mortality, n (%)

15 (44%)

7 (50%)

8 (40%)