Table 2

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

Variable

Baseline

After transfusion

Temperature (°C)

36.8 (36.2 to 37.5)

37 (36.4 to 37.7)

Heart rate (beats/minute)

94 (78 to 114)

94 (77 to 115)

Mean arterial pressure (mmHg)

76 (70 to 83)

80 (74 to 93)*

Central venous pressure (mmHg)

12 (9 to 16)

12 (9 to 16)

Mean pulmonary artery pressure (mmHg)^a

29 (27 to 33)

30 (26 to 39)

Pulmonary artery occlusion pressure (mmHg)^a

17 (15 to 18)

19 (14 to 19)

Cardiac index (l/minute/m²)^a

3.0 (2.7 to 3.4)

3.1 (2.9 to 3.4)

Hemoglobin concentration (g/dl)

7.1 (6.7 to 7.7)

8.4 (7.1 to 9)*

Arterial partial pressure of carbon dioxide (mmHg)

35 (32 to 37)

35 (31 to 38)

Arterial partial pressure of oxygen (mmHg)

94 (85 to 109)

93 (84 to 113)

pH

7.45 (7.39 to 7.48)

7.44 (7.4 to 7.5)

SaO₂ (%)

99 (98 to 99)

99 (98 to 99)

Lactate (mmol/l)

1.2 (0.9 to 2.2)

1.3 (0.8 to 2.1)

Mixed venous oxygen saturation (%)^a

65 (51 to 72)

70 (52 to 74)

Oxygen delivery (ml/minute/m²)^a

306 (259 to 337)

356 (332 to 422)*

Oxygen consumption (ml/minute/m²)^a

116 (85 to 142)

118 (97 to 168)

Oxygen extraction ratio (%)^a

34 (28 to 48)

28 (24 to 46)

Thenar tissue oxygen saturation (%)

90 (81 to 94)

90 (80 to 94)

Tissue hemoglobin index (arbitrary units)

14 (13 to 17)

13 (11 to 18)

Inverse thenar tissue oxygen desaturation slope (%/minute)

22 (17 to 35)

21 (16 to 32)

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

4.1 (2.1 to 5.4)

3.8 (2.9 to 5.1)

Muscle oxygen consumption (arbitrary units)

363 (240 to 536)

373 (215 to 500)

Data are presented as median (25th to 75th percentiles). ^aMeasurements obtained in 14 patients equipped with a pulmonary artery catheter. *P < 0.05 versus baseline.

Creteur et al. Critical Care 2009 13(Suppl 5):S11   doi:10.1186/cc8009