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CLINICAL TRIAL, PHASE IV
JOURNAL ARTICLE
MULTICENTER STUDY
RESEARCH SUPPORT, NON-U.S. GOV'T
von Willebrand factor/factor VIII concentrate (Humate-P) for management of elective surgery in adults and children with von Willebrand disease.
von Willebrand disease (VWD) is the most common inherited bleeding disorder. Treatment guidelines recommend the use of von Willebrand factor/factor VIII (VWF/FVIII) concentrate for VWD patients with type 2 or 3 VWD undergoing surgery, and type 1 patients undergoing surgery who are unresponsive, or for whom desmopressin acetate is contraindicated. This prospective, open-label, multinational study evaluated the safety, efficacy and optimal dosing of a VWF/FVIII concentrate (Humate-P) in subjects with VWD undergoing elective surgery. Dosing was based on VWF ristocetin cofactor (VWF:RCo) and FVIII pharmacokinetic assessments performed before surgery. Pharmacokinetic assessments were completed in 33 adults and 9 children. Haemostatic efficacy was assessed on a 4-point scale (excellent, good, moderate/poor or none). Overall effective haemostasis was achieved in 32/35 subjects. Median terminal VWF:RCo half-life was 11.7 h, and median incremental in vivo recovery was 2.4 IU dL(-1) per IU kg(-1) infused. Major haemorrhage occurred after surgery in 3/35 cases despite achieving target VWF and FVIII levels. Median VWF/FVIII concentrate loading doses ranged from 42.6 IU VWF:RCo kg(-1) (oral surgery) to 61.2 IU VWF:RCo kg(-1) (major surgery), with a median of 10 (range, 2-55) doses administered per subject. Adverse events considered possibly treatment-related (n = 6) were generally mild and of short duration. The results indicate that this VWF/FVIII concentrate is safe and effective in the prevention of excessive bleeding during and after surgery in individuals with VWD.
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