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Hemodialysis induces thrombocytopenia and activation of coagulation. The severity of this reaction depends on the kind of membrane. In this study, we present the results of determination of platelet count, and of different factors of coagulation in 10 stable dialysis patients. Measurements were performed at the start and after 15 and 45 min of dialysis. Samples were taken before and after the dialyzer. All 10 patients were treated consecutively and in a random order during 14 days with the following membranes: polyacrylonitrile (Filtral 12, Hospal), hemophan (GFS 120 Plus, Gambro, and Bio-Nephros HF Andante, Organon), polysulfone (F6, Fresenius), cuprammonium (AM50-BIO, Asahi) and cellulose acetate (Duo-Flux, Cordis-Dow). The cellulose acetate membrane induced a small but significant drop of mean platelet count [results are mean (SEM)]: from 245,000 (17,000) to 224,000 (16,000)/μl after 15 min. With the same membrane a dramatic increase after 15 min was noted of 6-keto-PGF1α from 56.3 (9) to 146.7 (35.7) pg/ml. The other membranes did not influence significantly prostanoid levels and platelet count. During dialysis no significant changes of fibrinopeptide A (FPA) and von Willebrand factor (VWF) were observed. Nevertheless, predialysis FPA and β-thromboglobulin (βTG) concentrations were lowest after 14 days of treatment with cellulose acetate and polyacrylonitrile membranes. It is concluded that the activation of coagulation depends on the membrane used. The activation may be dominated by one single system (e.g. prostanoids). The different predialysis concentration of some of the factors suggests interference of the dialysis membrane with the activation of coagulation during the interdialytic period.

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