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Unexplained periparturient thrombocytopenia.

J Freedman, E Musclow, B Garvey

    American Journal of Hematology
    |April 1, 1986
    PubMed
    Summary
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    Periparturient thrombocytopenia (PPT) affects 4.6% of women, causing low platelet counts near delivery. While usually benign, its exact cause remains unclear, necessitating further investigation.

    Area of Science:

    • Hematology
    • Obstetrics
    • Immunology

    Background:

    • Automated platelet counting has revealed unexplained periparturient thrombocytopenia (PPT) in a notable number of women around labor and delivery.
    • A significant percentage of periparturient women exhibit lower platelet counts compared to general blood donors and non-periparturient women.

    Purpose of the Study:

    • To investigate the incidence and characteristics of unexplained periparturient thrombocytopenia (PPT).
    • To explore potential immunological mechanisms and clinical implications of PPT.

    Main Methods:

    • Retrospective analysis of platelet counts in blood donors, prenatal, and postpartum women.
    • Evaluation of platelet radioactive antiglobulin tests (PRAT) in women with PPT and controls.
    • Assessment of serum complement levels and immune complexes in women with PPT.

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    Main Results:

    • 4.6% of 1,621 periparturient women had unexplained PPT (mean platelet count 122 +/- 24 X 10(9)/L).
    • Platelet counts typically normalized within a week postpartum, but persisted in 10% of cases.
    • 90% of women with PPT had positive indirect PRAT, often with anti-C3, differing from autoimmune thrombocytopenic purpura (AITP) patterns.

    Conclusions:

    • The etiology and mechanism of PPT remain unclear, with autoimmune or alloimmune causes not definitively excluded but showing distinct immunological patterns.
    • PPT is generally benign with no excessive bleeding, though some cases present with markedly reduced platelet counts.
    • Recognition of PPT is important in obstetrics due to its prevalence and potential for persistent thrombocytopenia.