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A Asakura, J Harrison, E Gomperts and C Abildgaard
Type IIA von Willebrand's Disease (vWD) is the most common type II variant,
and all reported cases (56 individuals in 26 families) have had autosomal
dominant inheritance. An eight-year-old female with an increased bleeding
tendency since infancy was found to have laboratory values typical of type
IIA vWD, but her parents and siblings were asymptomatic. With the exception
of uniformly decreased levels of ristocetin cofactor in relation to von
Willebrand factor antigen, the results of family studies were normal
including the presence of large multimeric forms of von Willebrand factor
antigen. These findings are consistent with the propositus having the
homozygous state of an autosomal recessive trait. Desmopressin infusion in
the propositus was followed by a significant increase of factor VIII
coagulant and von Willebrand factor antigen but a limited change in
ristocetin cofactor with no development of large multimers.
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| Copyright © 1987 by American Society of Hematology Online ISSN: 1528-0020 | |||||||||