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Passovoy factor deficiency in five Western Australian kindreds
Pathology
|July 1, 1981
Summary
Passovoy factor deficiency, an inherited bleeding disorder, affects 5 Australian families. This autosomal dominant condition causes easy bruising and bleeding after injury, with mild APTT prolongation often missed in diagnostics.
Area of Science:
- Hematology
- Genetics
- Coagulation Disorders
Background:
- Passovoy factor deficiency is an inherited coagulation abnormality impacting the intrinsic pathway.
- This condition presents with a bleeding tendency, particularly after trauma.
- It is inherited in an autosomal dominant pattern.
Observation:
- The defect was identified in five distinct kindreds within Western Australia.
- Patients exhibit easy bruising and significant blood loss post-surgery (e.g., dental extraction, tonsillectomy).
- Activated partial thromboplastin time (APTT) is prolonged, often mildly, potentially leading to underdiagnosis.
Findings:
- Fresh frozen plasma is effective for surgical prophylaxis.
- The mild degree of APTT prolongation contributes to its infrequent reporting.
- A significant portion (approx. one-third) of participants in a 1980 quality assurance program failed to detect this abnormality.
Implications:
- The prevalence in five kindreds suggests Passovoy factor deficiency may be relatively common in Australia.
- Careful identification and follow-up of minor APTT abnormalities are crucial during screening for inherited bleeding disorders.
- Improved diagnostic awareness is needed among hematology professionals.