I NHIBITORS to factor VIII develop in approximately 1 5% of patients with hemophilia with an incidence of approximately 8 per 1,000 patient-years of observation.’ Clinically, these can be divided into high response inhibitors, which exhibit an anamnestic response after exposure to factor VIII, and low response inhibitors, which do not exhibit significant anamnesis.2 Because of their neutralizin...

Seven new cases of pregnancy combined with von Willebrand's disease have been reported. Altogether the patients had 11 deliveries, and one abortion after 10 weeks' gestation. The diagnosis was based on the determination of the bleeding time, factor VIII coagulant activity (VIII C), factor VIII-related antigen (VIII RAg) and the ristocetin cofactor (VIII RCoF). Two of our 6 parturients showed pr...

Factor VIII coagulant activity (VIII(C)) and the von Willebrand's disease antigen (Factor VIII-like antigen, vW-Ag) are biologically linked, and it has been suggested that they reside on the same molecule. However, insolubilized human isoantibody to VIII(C) and rabbit antiserum containing antibodies to VIII(C) and vW-Ag differentially bind and remove these entities from plasma, thus physically ...

PERSISTENT or uncontrolled bleeding is one of the most feared consequences of any surgical procedure. Numerous factors can contribute to its etiology. Among these, both inherited and acquired disorders of coagulation and/or thrombocyte function need to be taken into account. Acquired hemophilia can be caused by antibodies to coagulation factors. Antibodies can arise in hemophilic or nonhemophil...

In the Chapel Hill colony of factor VIII-deficient dogs, abnormal sequence (ch8, for canine hemophilia 8, GenBank no. ) follows exons 1-22 in the factor VIII transcript in place of exons 23-26. The canine hemophilia 8 locus (ch8) sequence was found in a 140-kb normal dog genomic DNA bacterial artificial chromosome (BAC) clone that was completely outside the factor VIII gene, but not in BAC clon...

Hemophilia A is caused by a defect in coagulation factor VIII, a protein that undergoes extensive proteolysis during its activation and inactivation. To determine whether some cases of hemophilia are caused by mutations in important cleavage sites, we screened patient DNA samples for mutations in these sites by a two-step process. Regions of interest were amplified from genomic DNA by repeated ...

Previous studies suggest elevated factor VIII is a common, independent risk factor for venous thromboembolism (VTE); however, these studies included secondary and idiopathic VTE. We sought to explore the association between elevated factor VIII and VTE in Canadian patients with idiopathic thrombosis, and confirm the current upper factor VIII reference range was appropriate. We enrolled 300 cons...

I NHIBITORS to factor VIII develop in approximately 1 5% of patients with hemophilia with an incidence of approximately 8 per 1,000 patient-years of observation.’ Clinically, these can be divided into high response inhibitors, which exhibit an anamnestic response after exposure to factor VIII, and low response inhibitors, which do not exhibit significant anamnesis.2 Because of their neutralizin...