Table 2 Physiologic and near-infrared spectroscopy-derived variables before and 1 hour after red blood cell transfusion

Baseline

After Transfusion

Baseline

After Transfusion

n

Mean (SD)

Mean (SD)

p

n

Mean (SD)

Mean (SD)

p

Hemoglobin (g/dl)

21

7.2 (0.8)

8.7 (1.1)

0.00

11

7.5 (0.8)

8.9 (1.1)

0.00

Heart Rate (beats/min)

21

91

(15)

91 (15)

0.34

11

91 (18)

89 (18)

0.14

Temperature (°F)

21

97.8 (1.2)

97.7 (1.2)

0.65

11

98.1 (1.2)

98.1 (1.2)

0.96

Mean arterial pressure (mmHg)

21

69.6 (8.7)

73.5 (11.1)

0.08

11

67.3 (7.9)

73.2 (12.1)

0.02

Central venous pressure (mmHg)

12

16 (5.7)

16.2 (4.3)

0.79

7

15.2 (4.3)

16.1 (5)

0.34

Lactate (mmol/l)

12

4.1 (3.5)

3.9 (3.4)

0.47

6

3.7 (2.1)

3.8 (2.4)

0.73

Arterial partial pressure of oxygen (mmHg)

6

124.6 (97.6)

95.2 (29.2)

0.49

3

164 (137.1)

101 (38)

0.5

pH

6

7.3(0.1)

7.3 (0.1)

0.62

3

7.3(0.1)

7.3(0.1)

0.24

Central venous oxygen saturation (%)

10

59.1 (9.2)

63.8 (8.8)

0.11

6

62.3 (9.2)

64.6 (8.9)

0.48

SaO₂/FiO₂

21

264.1 (114.8)

270.9 (97.2)

0.46

11

249.5 (105.9)

259.1 (91.5)

0.19

Thenar tissue oxygen saturation (%)

21

76.2 (9.3)

75.8 (8.1)

0.80

11

76.8 (8.4)

75.8 (8.8)

0.69

Tissue hemoglobin index (arbitrary units)

21

10.7 (3.4)

12.2 (3.5)

0.01

11

10.9 (3.1)

12.2 (4.1)

0.07

Thenar tissue oxygen saturation upslope of the reperfusion phase (%/second)

21

2.5 (1.3)

2.6 (1.5)

0.39

11

2.2 (1)

2.1 (1.1)

0.78

Muscle oxygen consumption (arbitrary units)

21

113.6 (56.43)

124.1 (43.6)

0.26

11

104.4 (41.1)

112.5 (40.3)

0.5