Table 1 Patients’ demographic characteristics, anesthesia time and incidence of POD

Demographic and clinical characteristics

 Age (years) mean ± SD

65.88 ± 3.63

65.41 ± 4.26

0.593

 Sex (Female) n (%)

27 (64.29%)

26 (63.41%)

0.934

 Height (cm) mean ± SD

163.80 ± 7.55

163.00 ± 6.91

0.601

 Weight (kg) mean ± SD

67.38 ± 10.29

67.21 ± 11.40

0.942

 Body mass index (kg/m²) mean ± SD

25.07 ± 2.97

25.22 ± 3.38

0.828

 ASA score of 2, n (%)

40 (95.24%)

38 (92.68%)

0.978

Frequency of comorbidities

 Hypertension, n (%)

15 (35.71%)

13 (31.71%)

0.700

 Diabetes, n (%)

10 (23.81%)

6 (14.63%)

0.289

 Coronary artery disease, n (%)

6 (14.29%)

8 (19.51%)

0.525

Serum sodium (mmol/L) mean ± SD

 Pre-operation

138.90 ± 5.78

139.40 ± 5.75

0.661

 1 h after the operation

147.10 ± 2.44

141.00 ± 4.12

 < 0.001^**

 24 h after the operation

140.00 ± 5.29

138.00 ± 4.28

0.069

 Duration of anesthesia (min) mean ± SD

228.50 ± 53.63

231.00 ± 39.47

0.805

 Cerebral desaturation events, n (%)

6 (14.29%)

14 (34.15%)

0.034^*

 Incidence of POD, n (%)

3 (7.14%)

11 (26.83%)

0.036^*

 Need for vasopressors, n (%)

8 (19.05%)

15 (36.59%)

0.074

 Amount of intraoperative fluids (mL) median (IQR)

1300 (1200–1563)

1500 (1300–1600)

0.052