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Table 1 Characterizing measures of preoperative cerebral and arterial oxygen saturation and intraoperative cerebral oxygen saturation in patients with or without postoperative delirium

From: Preoperative regional cerebral oxygen saturation is a predictor of postoperative delirium in on-pump cardiac surgery patients: a prospective observational trial

Parameter

Delirium

n= 62

Control

n= 169

Pvalue

ScO2room

58.1 (7.7)

63.1 (7.2)

≤ 0.001a

SaO2room

96.5 (1.9)

96.1 (2.0)

0.175a

ScO2base

62.8 (7.8)

67.6 (6.9)

≤ 0.001a

SaO2base

99.5 (0.7)

99.4 (0.9)

0.539a

ScO2base - ScO2room

4.6 (3.9)

4.4 (2.8)

0.663a

SaO2base - SaO2room

3.5 (1.8)

2.9 (1.6)

0.053a

ScO2ind

57.6 (7.5)

63.1 (7.4)

≤ 0.001a

Intraoperative ScO2

   

   Lowest value, ScO2min

48.6 (9.3)

55.1 (8.6)

≤ 0.001b

   Highest value

77.4 (6.9)

81.4 (6.4)

≤ 0.001b

   < 80% of baseline, minimum

3.5 (12.2)

3.9 (15.2)

0.183b

   < 80% of baseline, AUC

17.2 (48.5)

22.8 (93.9)

0.095b

   < 50% absolute value, minimum

9.4 (23.3)

3.0 (11.8)

≤ 0.001b

   < 50% absolute value, AUC

41.6 (114.9)

19.5 (94.9)

≤ 0.001b

ScO2base - ScO2min

13.6 (10.0)

12.6 (8.4)

0.540a

ScO2room - ScO2min

9.1 (9.8)

7.9 (7.7)

0.428a

  1. Data other than P values are presented as mean (standard deviation). aStudent t test; bMann-Whitney U test. AUC, area under the curve; SaO2base, arterial oxygen saturation with patient breathing 4 L per minute supplemental oxygen; SaO2room, arterial oxygen saturation with patient breathing room air; ScO2, cerebral oxygen saturation; ScO2ind, regional cerebral oxygen saturation immediately before induction of anesthesia; ScO2base, regional cerebral oxygen saturation with patient breathing 4 L per minute supplemental oxygen; ScO2room, regional cerebral oxygen saturation with patient breathing room air.