Table 1 Patient characteristics, according to postoperative diagnosis of delirium

Male, n (%)

66 (60.6)

35 (72.9)

31 (70.4)

0.082

Body mass index (BMI)

27.1 ± 3.9

27.1 ± 3.3

27.2 ± 4.5

0.91

Mean age, (years)

67.5 ± 8.9

64.5 ± 9

70.8 ± 7.8

0.001

Alcohol abuse, n (%)

10 (10.9)

3 (6.2)

7 (15.9)

0.14

Smoking, n (%)

23 (25)

7 (14.6)

16 (36.3)

0.016

Diabetes, n (%)

21 (22.8)

10 (20.8)

11 (25)

0.63

Arterial hypertension, n (%)

89 (96.7)

46 (95.8)

43 (97.7)

0.34

Chronic obstructive lung disease, n (%)

20 (21.7)

7 (14.6)

13 (29.5)

0.09

Renal insufficiency, n (%)

13 (14.1)

5 (10.4)

8 (18.2)

0.25

Impaired left ventricular function, EF n (%): normal (≥55%)

58 (63)

30 (62.5)

28 (65.1)

0.7

Mild (45-54%)

16 (17.4)

10 (20.8)

5 (11.6)

Moderate (36-44%)

8 (8.7)

3 (6.3)

4 (9.3)

Severe (≤35%)

11 (12.5)

5 (10.4)

6 (14)

History of stroke, n (%)

7 (7.6)

3 (6.3)

4 (9.1)

0.48

Atrial fibrillation preoperative, n (%)

13 (14.1)

6 (12.5)

7 (16.7)

0.22

Long-term glucocorticoid medication, n (%)

5 (5.4)

0 (0.0)

5 (11.4)

0.056

Albumin g/l

43.5 ± 3.4

44.4 ± 3.1

42.3 ± 3.4

0.003

Hemoglobin g/dl

13.2 ± 1.6

13.7 ± 1.5

12.7 ± 1.6

0.005

Urea mg/dl

37.9 ± 19.0

36.1 ± 13.9

40.2 ± 23.5

0.33

Mean number of transfused packs of RBC

3.0 ± 2.3

2.2 ± 1.8

3.8 ± 2.6

0.001

Type of heart surgery (CABG/open heart surgery ± CABG)

47/45

26/22

21/23

0.54

Mean extracorporeal circulation time (min.)

112 ± 41.5

108 ± 41.4

115 ± 42

0.37

Postoperative intubation time (hrs) median (IQR [range])

13 (10-18 [4-91])

11 (9-14 [5-29])

18 (14-23[4-91])

<0.001

Time (days) spent in intensive and intermediate care unit, median (IQR [range])

5 (3-6 [2-17])

4 (3-5 [2-15])

6 (5-8 [2-17])

<0.001

Time (hrs) spent in intensive care unit, median (IQR [range])

23 (20-47 [11-289])

21 (19-24 [12-77])

46 (23-78[11-289])

<0.001

Benzodiazepine intake during the night of the sleep study (yes/no)

22 (25.6)

12 (27.9)

10 (25.6)

0.82