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Table 2 Absolute rSO 2 readings of <50% or a reduction of >20% or >25% below the patient’s baseline rSO 2 observed during the procedure

From: Relationship between intraoperative regional cerebral oxygen saturation trends and cognitive decline after total knee replacement: a post-hoc analysis

rSO2

No. of patients

Baseline rSO2values

 

n (% of 125)

Mean (SD)

Range

P*

Right hemisphere

    

 Absolute value

    

  ≥50%

99 (79.2)

66.7% (6.6%)

53%–78%

<0.0001

  <50%

26 (20.8)

59.1% (6.5%)

44%–78%

 Reduction from baseline

    

  >20%

22 (17.6)

  >25%

11 (8.8)

Left hemisphere

    

 Absolute values

    

  ≥50%

103 (82.4)

66.4% (5.5%)

53%–80%

<0.0001

  <50%

22 (17.6%)

59.9% (5.3%)

47%–70%

 Reduction from baseline

    

  >20%

20 (16)

  >25%

8 (6.4)

  1. *Comparison of baseline rSO2 of patients who reached an absolute rSO2 reading <50% and those who did not.
  2. rSO2 = regional cerebral oxygen saturation.
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BMC Anesthesiology

ISSN: 1471-2253

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