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Hereditary hemorrhagic telangiectasia. A family study
D Steel1, E G Bovill, E Golden
1Department of Pathology, University of Vermont College of Medicine, Burlington 05405.
American Journal of Clinical Pathology
|September 1, 1988
Summary
This study found no platelet or Factor VIII abnormalities in hereditary hemorrhagic telangiectasia (HHT) patients. However, severe HHT cases showed increased Factor VIIIc and shortened APTTs with elevated antithrombin III.
Area of Science:
- Hematology
- Genetics
- Vascular Biology
Background:
- Hereditary hemorrhagic telangiectasia (HHT) is a genetic disorder affecting blood vessels.
- The hemostatic system's role in HHT pathogenesis requires further elucidation.
- Previous studies suggested potential hemostatic abnormalities in HHT.
Purpose of the Study:
- To conduct a comprehensive evaluation of the hemostatic system in HHT patients.
- To investigate potential links between HHT severity and specific coagulation factors.
- To re-examine platelet aggregation and Factor VIII complex function in HHT.
Main Methods:
- Analysis of the hemostatic system in eight related HHT patients.
- Assessment of platelet aggregation.
- Evaluation of Factor VIII complex activity and levels (Factor VIIIc).
- Measurement of activated partial thromboplastin times (APTTs) and antithrombin III levels.
Main Results:
- No evidence of platelet aggregation abnormalities was found.
- No qualitative abnormalities of the Factor VIII complex were identified.
- A subgroup of severely affected patients exhibited increased Factor VIIIc levels.
- Shortened APTTs and mild elevations in antithrombin III were observed in this subgroup.
Conclusions:
- The hemostatic system in HHT may not be universally impaired in terms of platelet function or Factor VIII quality.
- Elevated Factor VIIIc, shortened APTTs, and increased antithrombin III may characterize a subset of severe HHT cases.
- These findings suggest a complex interplay between HHT genetics and coagulation dynamics.