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The von Willebrand syndrome
British Journal of Haematology
|April 1, 1975
Summary
This study differentiates classical von Willebrand's disease from emerging subgroups. It proposes distinct terminology for patients with reduced factor VIII related protein and Ristocetin aggregation versus those with varying abnormalities.
Area of Science:
- Hematology
- Genetics
Background:
- Von Willebrand's disease (VWD) is a heterogeneous bleeding disorder.
- Classical VWD is characterized by reduced levels of factor VIII related protein and impaired Ristocetin-induced platelet aggregation.
Observation:
- Five patients presented with atypical features compared to classical VWD.
- Two patients had normal factor VIII related protein but reduced Ristocetin aggregation, with one showing a plasma defect and the other a platelet abnormality.
- Three severely affected patients lacked familial evidence of classical VWD.
Findings:
- Cryoprecipitate infusion corrected abnormalities in two patients.
- One patient showed a secondary rise in factor VIII, while the other exhibited a rise in both factor VIII and factor VIII related protein post-infusion.
- The study identified distinct patient groups based on factor VIII related protein levels, aggregation patterns, and family history.
Implications:
- Suggests refining the classification of von Willebrand's disease.
- Proposes using "von Willebrand's syndrome" for emerging subgroups with diverse clinical and laboratory findings.
- Highlights the importance of comprehensive diagnostic evaluation, including genetic and functional assays, for accurate VWD diagnosis and subtyping.