Table 2

Laboratory and physiological measurements before and after transfusion

High-haematocrit groupLow-haematocrit group
PretransfusionPost-transfusionp*PretransfusionPost-transfusionp*
Haemoglobin, g/dl13.6 (1.0)16.3 (1.6)<0.00019.1 (1.4)13.1 (1.4)<0.0001
Haematocrit, %39 (7)48 (5)<0.000127 (4)38 (4)<0.0001
RBC count, ×106/μl4.1 (0.7)5.4 (0.6)<0.00012.9 (0.5)4.2 (0.6)<0.0001
Reticulocyte count, ×103/μl53 (20)62 (19)0.41253 (16)61 (21)0.586
Blood lactic acid, mmol/l1.1 (0.2)0.7 (0.1)<0.00011.1 (0.2)0.9 (0.2)0.032
Plasma erythropoietin, mU/ml16 (6)14 (6)0.59616 (7)14 (5)0.609
Cardiac output, ml/min per kg291 (98)277 (91)0.402301 (101)253 (66)0.048
Arterial oxygen content, ml/dl16 (2)20 (3)<0.000112 (2)17 (2)<0.0001
Oxygen consumption, ml/min per kg8.1 (1.5)8.1 (1.1)>0.9910.0 (1.7)9.0 (1.1)0.279
Systemic oxygen transport, ml/min per kg44 (7)57 (12)0.00433 (4)41 (5)0.001
Fractional oxygen extraction0.20 (0.08)0.17 (0.08)0.2500.31 (0.11)0.24 (0.12)0.003
Mean FiO20.31 (0.09)0.32 (0.10)0.5610.32 (0.11)0.31 (0.12)0.055
Mean oxygen saturation, %96 (3)96 (3)0.56396 (3)95 (2)0.333
Mixed venous O2 content, ml/dl13 (2)17 (2)<0.00018 (2)13 (3)<0.0001
  • Values are mean (SD).

  • * Pretransfusion versus post-transfusion.

  • p<0.05, Pretransfusion low versus pretransfusion high.

  • p<0.05, Post-transfusion low versus post-transfusion high.

  • RBC, red blood cells.