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Table 2 NIRS variables during the vascular occlusion tests.

From: 500 ml of blood loss does not decrease non-invasive tissue oxygen saturation (StO2) as measured by near infrared spectroscopy - A hypothesis generating pilot study in healthy adult women

Blood donors

Before blood donation

After blood donation

 
 

median

IQR

median

IQR

two-tailed p-value

StO2 rate of decrease(%/sec)

-0.19

-0.21 - -0.16

-0.19

-0.23 - -0.15

0.78

StO2 rate of recovery (%/sec)

3.04

2.57 - 3.45

3.29

2.79 - 3.48

0.25

StO2 delta (%)

14.0

12.0 - 15.8

13.5

12.0 - 18.0

0.36

O2Hb rate of decrease (/sec)

-0.033

-0.043 - -0.026

-0.027

-0.055 - -0.021

0.98

O2Hb rate of recovery (/sec)

0.59

0.50 - 0.72

0.63

0.48 - 0.74

0.59

O2Hb delta

4.33

3.47 - 4.97

4.76

4.24 - 5.42

0.06

Control

Before rest period

After rest period (19 minutes)

 
 

median

IQR

median

IQR

two-tailed p-value

StO2 rate of decrease (%/sec)

-0.17

-0.19 - -0.15

-0.15

-0.20 - -0.12

0.43

StO2 rate of recovery (%/sec)

2.64

2.00 - 2.88

2.43

2.00 - 3.47

0.29

StO2 delta (%)

12.5

11.3 - 13.3

13.5

11.5 - 15.25

0.10

O2Hb rate of decrease (/sec)

-0.039

-0.051 - -0.026

-0.031

-0.046 - -0.020

<0.01*

O2Hb rate of recovery (/sec)

0.49

0.39 - 0.63

0.54

0.39 - 0.69

<0.05*

O2Hb delta

3.88

2.43 - 4.20

4.00

3.32 - 5.72

<0.01*

  1. IQR: interquartile range, *: p < 0.05
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Journal of Trauma Management & Outcomes

ISSN: 1752-2897

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