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Related Experiment Videos

Complement activation in relation to development of preeclampsia.

M Haeger1, M Unander, A Bengtsson

  • 1Department of Obstetrics and Gynecology, Sahlgren Hospital, Göteborg, Sweden.

Obstetrics and Gynecology
|July 1, 1991
PubMed
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Complement activation, measured by anaphylatoxins (C3a, C5a) and C5b-9 complexes, was studied in pregnancy. Elevated levels were found at delivery in preeclampsia and HELLP syndrome, but not before clinical signs, indicating they are not early predictors.

Area of Science:

  • Obstetrics and Gynecology
  • Immunology
  • Maternal-Fetal Medicine

Background:

  • Preeclampsia and HELLP syndrome are serious pregnancy complications.
  • The role of complement system activation in these conditions is not fully understood.
  • Early detection of preeclampsia remains a clinical challenge.

Purpose of the Study:

  • To investigate complement activation during pregnancy in relation to preeclampsia and HELLP syndrome.
  • To determine if complement activation markers can predict preeclampsia development.
  • To assess complement activation at different stages of pregnancy and postpartum.

Main Methods:

  • Longitudinal study of 685 primigravidas, with complement activation markers measured at four time points during pregnancy.

Related Experiment Videos

  • Analysis of plasma for anaphylatoxins (C3a, C5a) and terminal C5b-9 complement complexes.
  • Comparison of marker levels between women who developed preeclampsia/HELLP syndrome and uncomplicated controls at delivery and postpartum.

    • Main Results:

    • Significantly elevated plasma C5a and C3a levels were observed at delivery in women with preeclampsia compared to controls.
    • Elevated C3a, C5a, and C5b-9 were found in the one woman with HELLP syndrome at delivery.
    • No complement activation elevations were detected before clinical signs of preeclampsia appeared.
    • Terminal C5b-9 complexes were not altered in preeclampsia but were elevated in HELLP syndrome at delivery.

    Conclusions:

    • Systemic complement activation does not occur early in pregnancy in relation to preeclampsia.
    • Plasma concentrations of C3a, C5a, or C5b-9 are not reliable predictors for preeclampsia.
    • Complement activation markers may be elevated in severe cases like HELLP syndrome at the time of delivery.