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Platelet activation in preeclampsia.

M L Socol, C P Weiner, G Louis

    American Journal of Obstetrics and Gynecology
    |February 15, 1985
    PubMed
    Summary
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    Elevated beta-thromboglobulin indicates platelet activation in preeclampsia and chronic hypertension with superimposed preeclampsia. This suggests microvascular platelet consumption, not intrinsic platelet changes, is the cause.

    Area of Science:

    • Obstetrics and Gynecology
    • Hematology
    • Nephrology

    Background:

    • Preeclampsia and chronic hypertension with superimposed preeclampsia are significant pregnancy complications.
    • Platelet activation plays a crucial role in the pathophysiology of these hypertensive disorders.
    • Understanding platelet behavior is key to managing these conditions.

    Purpose of the Study:

    • To assess platelet activation markers in hospitalized third-trimester patients with preeclampsia or chronic hypertension with superimposed preeclampsia.
    • To compare platelet activation between these patient groups and healthy pregnant controls.
    • To investigate the relationship between platelet activation markers and indicators of disease severity.

    Main Methods:

    • Measured plasma beta-thromboglobulin, platelet factor 4, platelet aggregate ratio, and collagen-induced aggregation (Kd).

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  • Included 11 patients with preeclampsia, 11 with chronic hypertension with superimposed preeclampsia, and 10 healthy controls.
  • Correlated beta-thromboglobulin levels with urinary protein loss and serum creatinine.

    • Main Results:

    • Significantly elevated plasma beta-thromboglobulin levels were observed in both preeclampsia and chronic hypertension with superimposed preeclampsia groups compared to controls.
    • Beta-thromboglobulin levels correlated with increased urinary protein loss and serum creatinine, and decreased creatinine clearance in preeclampsia patients.
    • Platelet aggregate ratio and collagen-induced aggregation (Kd) did not differ, suggesting no intrinsic platelet responsiveness change.

    Conclusions:

    • Elevated beta-thromboglobulin is a marker of platelet activation in preeclampsia and chronic hypertension with superimposed preeclampsia.
    • The findings suggest increased beta-thromboglobulin is secondary to platelet consumption in the microvasculature.
    • Altered renal function may contribute to elevated beta-thromboglobulin in preeclampsia.