von willebrand’s disease - hemepathreviewhemepathreview.com/heme-review/chap28b-vwd.pdf ·...
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![Page 1: Von Willebrand’s Disease - HemePathReviewhemepathreview.com/Heme-Review/Chap28B-vWD.pdf · 2016-08-10 · von Willebrand’s Disease Amy Sanchez, M.D. July 12th, 2004 . Introduction](https://reader034.vdocuments.us/reader034/viewer/2022042303/5ece15a276ae9231b56f48ec/html5/thumbnails/1.jpg)
von Willebrand’s Disease
Amy Sanchez, M.D.
July 12th, 2004
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Introduction
• Disorder of primary hemostasis first described in
1926 by Eric von Willebrand
• Most common inherited disorder of bleeding in
humans with an estimated prevalence of 1%
• Most types are inherited in a autosomal dominant
fashion – males and females equally affected
• Majority type I (70%) with 20% type II
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Hemostasis Review
vasoconstriction
1. exposed ECM
2. platelet adhesion
3. granule release
4. aggregation
1. coagulation cascade
2. fibrin polymerization
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Symptoms
• Spectrum of clinical severity- many are subclinical
• Recurrent mucocutaneous bleeding, often spontaneous
• Excessive bleeding from wounds
• Menorrhagia
• Do not have intramuscular or deep subcutaneous bleeding or hemarthroses
• All in the setting of prolonged bleeding time with
normal platelet count
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von Willebrand Factor
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Type I
• Most common, 70% are Type I
• Reduced quantity of circulating vWF
• AD with reduced penetrance and variable expressivity, heterozygous
• Clinical symptoms usually mild
• Factor VIII activity (VIII:C), vWF antigen (vWF:Ag), and the ristocetin cofactor activity (vWF:RCoF) decreased
• Normal spectrum of multimers
• Responds to DDAVP
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Type II –General
• Autosomal dominant, heterozygous
• Much less common with several variants
• Characterized by normal levels of
dysfunctional protein
• Lack of larger multimers in plasma while
retaining smaller multimers
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Type IIA
• Absence of large and medium-sized multimers in
plasma and platelets
• Small multimers cannot bind to the GPIb receptor
on platelets in the presence of ristocetin
• VIII:C , vWF:Ag , vWF:RCoF , bleeding
time
• Clinical symptoms usually moderate to severe
• DDAVP ineffective
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Type IIB
• Much less common than Type IIA
• Autosomal dominant
• Absence of large multimers in plasma but
not in platelets due to abnormal affinity for
platelet adhesion – creates secondary
thrombocytopenia
• Adverse response to DDAVP
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Type III
• Rare, very severe, autosomal recessive form,
1:1,000,000
• Usually offspring of two parents with mild type I
disease
• May be compound heterozygous or homozygous
for one defect
• No detectable vWF activity
• Severe mucosal bleeding with occasional
hemarthroses
• No response to DDAVP
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Acquired vWD
• Sporadic form
• Associated with immunologic disorders (lymphoma, SLE, MM, myeloproliferative d/o, benign monoclonal gammopathy)
• IgG autoantibodies to the VIII:vWF complex or absorption by malignant cells
• Treat the underlying disorder i.e. corticosteroid therapy or radiation
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Platelet Type (Pseudo) vWD
• Similar picture to that of Type IIB
• Mutation in the GPIb gene that produces
increased affinity of platelets to vWF
• Lack of large multimers secondary to
clearance by platelet binding
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Testing Parameter Type 1 Type 2A Type 2B Type 3
Bleeding
time or N
Platelet
count N N or N N
vWF:Ag or N or N
vWF:RCoF , N or
Multimers N Abn Abn ND
VIII or N or N
RIPA or N
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Ristocetin Induced Aggregation
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Ristocetin Induced Aggregation
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Treatment
• Type I – DDAVP usually sufficient for transient
control of bleeding for minor surgical procedures
• Type 2A – cryopercipitate or purified factor VIII
• Type 2B – cryoprecipitate or purified factor VIII,
DDAVP contraindicated
• Type 3 – cryopercipitate or purified factor VIII
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References
• McClatchey, Kenneth D., Clinical Laboratory
Medicine. Second edition, 1013-1016.
• Kjeldsberg, Carl. Practical Diagnosis of
Hematologic Disorders. Third Edition, 751-773.
• Jandl, James H. Blood: Textbook of Hematology.
Second Edition, 1382-1391
• Fauci et al. Harrison’s Principals of Internal
Medicine. 14th Edition, 732-734.