Summary
A heat-treated factor VIII (F VIII) concentrate (Haemate P) has been administered to patients with various types of von Willebrand's disease (vWD). The 4 activities of F VIII/vWF as well as change in the multimeric structure of vWF were then studied. In 4 patients with type I vWF who were given a Ristocetin cofactor (Rcof) dose of 42–78 U/kg, there was a clear reduction of the bleeding time and an increase of F VIII:C, F VIII:Ag, Ag, Rcof and vWF: Ag for several hours. The recovery of Rcof. after 1 h was 50–75%. Although the multimeric composition of vWF in these patients was similar to that of normal plasma, the density of each multimer band was very low. After infusion, however, the density of all multimer bands increased for several hours, to decrease again after 24 h. In 4 patients with type II A vWD who received a dose of Rcof of 55–76 U/kg, the 4 activities of F VIII/vWF increased similarly as was the case in type I. All patients had only 3–4 smaller multimer bands. New larger and intermediate multimers appeared for several hours after infusion of the preparation. Two patients with type III vWD who received doses of Rcof of 52 and 65 U/kg showed also a similar increase in the 4 activities of F VIII/vWF after infusion. All the multimers lacking in these patients appeared for several hours after infusion.
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Fukui, H., Nishino, M., Terada, S. et al. Hemostatic effect of a heat-treated factor VIII concentrate (Haemate P) in von Willebrand's disease. Blut 56, 171–178 (1988). https://doi.org/10.1007/BF00320748
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DOI: https://doi.org/10.1007/BF00320748