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) |