Effect of transfusion on oxygen transport in critically ill patients.

The role of isolated blood transfusion as a means toward improving oxygen transport was evaluated in 19 critically ill patients having sepsis syndrome as defined by standard criteria. ICU therapies were unchanged during transfusion and hemodynamic profiles with serum lactate levels were obtained before and after packed red blood cells were given. Blood transfusions in these patients did not cause a change in hemodynamic status. Arterial lactate determination was normal before and after transfusion was administered. Oxygen uptake failed to increase with transfusion, corresponding to increased arterial and mixed venous oxygen content. In the presence of sepsis, patients having oxygen delivery and uptake above normal without evidence of ischemia (normal lactate) will not increase oxygen consumption by raising the hemoglobin.