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Essential thrombocythemia in a child: platelet ultrastructure and function

M I Barnhart, T H Kim, B L Evatt

    American Journal of Hematology
    |January 1, 1980
    PubMed
    Summary

    Essential thrombocythemia can cause hemoptysis in children. This study details a rare case, revealing significant platelet defects including abnormal structure and aggregation, potentially linked to membrane issues.

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    Area of Science:

    • Hematology
    • Pediatric Thrombosis
    • Platelet Biology

    Background:

    • Essential thrombocythemia is a myeloproliferative neoplasm characterized by elevated platelet counts.
    • Hemoptysis is a rare but serious complication, particularly in pediatric cases.
    • Understanding platelet dysfunction is crucial for managing thrombotic disorders.

    Observation:

    • A nine-year-old girl with essential thrombocythemia presented with hemoptysis.
    • Ultrastructural analysis revealed megathrombocytes and defects in platelet organelles, including faulty microtubular systems and reduced alpha granules.
    • Spontaneous platelet aggregation was abnormal, lacking compactness.

    Findings:

    • Platelet aggregation studies showed subnormal responses to ADP, epinephrine, and collagen, but normal aggregation with ristocetin.

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  • Qualitative and quantitative defects in platelet organelles were identified.
  • A potential platelet membrane abnormality is hypothesized as the cause of defective aggregation.

    • Implications:

    • This case highlights a rare presentation of essential thrombocythemia in a child.
    • Findings suggest a link between specific platelet structural and functional defects and bleeding complications.
    • Further research into platelet membrane abnormalities may offer new therapeutic targets for thrombotic disorders.