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Increased factor VIII/vWf levels in patients with reduced platelet number

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Summary

Factor VIII/von Willebrand factor (VIII/vWf) related properties were studied in twenty six patients with thrombocytopenia. Fifteen patients were affected by idiophatic thrombocytopenic purpura (ITP) and 11 patients by thrombocytopenia of a different nature or non-ITP (n-ITP). All patients showed an enhancement of platelet associated IgG (PAIgG). A significant increase of factor VIII ristocetin cofactor (VIII R: RCoF) and factor VIII related antigen (VIII R: Ag) was found in ITP patients while normal values were observed for factor VIII coagulant (VIII: C). All factor VIII/vWf components, on the contrary, were increased in n-ITP group with a prevalence of VIII R: RCoF as observed in ITP group even though with lower mean values. Multimeric analysis of VIII/vWf demonstrated a higher concentration of all multimeric components, with major representation of higher molecular weight multimers (HMWM) in patients of both groups.

Two patients were studied before and after improvement in platelet count. A decrease of vWf related properties (VIII R : RCoF and VIII R : Ag) concomitant with the increase in platelet count was found. In n-ITP patients a statistical correlation between VIII R : RCoF and PAIgG was also observed while no correlation was found between other factor VIII/vWf components and PAIgG both in ITP and n-ITP patients.

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Authors and Affiliations

  1. Institute of Medical Semeiotics and Second Chair of Medicine, University of Padua, Medical School, Padua, Italy

    A. Casonato, F. Fabris, M. Boscaro & A. Girolami

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  1. A. Casonato
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  2. F. Fabris
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  3. M. Boscaro
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  4. A. Girolami
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Casonato, A., Fabris, F., Boscaro, M. et al. Increased factor VIII/vWf levels in patients with reduced platelet number. Blut 54, 281–288 (1987). https://doi.org/10.1007/BF00320876

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