Patients receiving multiple whole blood transfusions often experience adverse clinical symptoms caused by leukocytes. In the present study, the efficacy and safety of a polyester filter for leukocytes (Sepacell R-500) was evaluated. Donor units of whole blood and red cell concentrate stored for varying lengths of time were filtered. Emphasis was placed on humoral parameters indicative of release and/or activation reactions of granulocytes (neutral proteinase elastase, lysozyme, aggregation, chemiluminescence) and erythrocytes (lactate dehydrogenase, plasma haemoglobin). Nonspecific adsorption effects were investigated by plasma protein determinations (albumin, alpha 2-macroglobulin). A complete blood cell count as well as values of haemoglobin and haematocrit were determined. Sepacell R-500 proved to be a highly efficient filter to the leukocyte depletion of blood. Our results of erythrocyte and granulocyte related humoral parameters provided no significant evidence of filtration mediated activation or releasing reactions of clinical consequence.
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