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  • Title: Successful treatment for patients with von Willebrand disease undergoing urgent surgery using factor VIII/VWF concentrate (Humate-P).
    Author: Thompson AR, Gill JC, Ewenstein BM, Mueller-Velten G, Schwartz BA, Humate-P Study Group.
    Journal: Haemophilia; 2004 Jan; 10(1):42-51. PubMed ID: 14962219.
    Abstract:
    von Willebrand disease (VWD) is characterized by insufficient von Willebrand factor (VWF) activity. It has been proposed that VWF:ristocetin cofactor (VWF:RCo) activity may be useful in evaluating the response to VWD treatment in patients who require replacement therapy. This prospective, open-label, non-randomized study evaluated the safety and efficacy of a factor VIII (FVIII)/VWF concentrate (Humate-P) used in treatment regimens based on VWF:RCo activity in subjects with VWD in situations requiring urgent and necessary surgery. This article summarizes the results for 39 subjects with 42 evaluable surgical treatment events, 100% of which were rated as excellent/good for overall efficacy (achievement of haemostasis). The median loading dose based upon VWF:RCo activity was 82.3 international units/kilogram (IU kg(-1); range 32.5-216.8 IU kg(-1)), and the median maintenance dose per infusion was 52.8 IU kg(-1) (range 24.2-196.5 IU kg(-1)) for a median of 3 days (range 1-50 days). The median number of infusions per event was 6 (range 1-67 infusions). Three unanticipated adverse events (peripheral oedema, extremity pain and pseudo-thrombocytopenia) from two surgical treatment events were reported that were potentially treatment-related. No serious drug-related adverse events (AEs) were observed, and no thrombotic events were reported in this study. This study supports the safety and efficacy of the FVIII/VWF concentrate Humate-P for the prevention of surgical haemorrhage in patients with VWD when administered in doses calculated in VWF:RCo units.
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