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Pre-eclampsia/eclampsia in twin pregnancies

A McFarlane, J S Scott

    Journal of Medical Genetics
    |June 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Twin pregnancies show a threefold higher risk of pre-eclampsia/eclampsia compared to singleton pregnancies. This increased risk in twin gestations may exceed the combined risk of two singleton pregnancies.

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    Area of Science:

    • Obstetrics and Gynecology
    • Perinatal Medicine
    • Immunology in Pregnancy

    Background:

    • Pre-eclampsia/eclampsia is a serious pregnancy complication.
    • Twin pregnancies are known to have a higher risk of complications compared to singleton pregnancies.
    • The role of zygosity in the incidence of pre-eclampsia/eclampsia in twin gestations requires further investigation.

    Purpose of the Study:

    • To investigate the relationship between zygosity and the incidence of pre-eclampsia/eclampsia in twin pregnancies.
    • To compare the risk of pre-eclampsia/eclampsia in twin pregnancies versus singleton pregnancies.
    • To explore potential immunological factors contributing to increased gestosis risk in twin pregnancies.

    Main Methods:

    • Analysis of data from 1045 twin gestations.

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  • Classification of twin gestations by known or likely zygosity (dizygous, presumed monozygous, estimated monozygous).
  • Comparison of pre-eclampsia/eclampsia incidence across zygosity groups and with singleton pregnancies.

    • Main Results:

    • No significant differences in pre-eclampsia/eclampsia incidence were found between known dizygous and presumed monozygous twins.
    • A notable exception was observed in 'estimated' monozygous twins of multigravidae.
    • A threefold increase in pre-eclampsia/eclampsia incidence was observed in twin pregnancies compared to singleton pregnancies.

    Conclusions:

    • Zygosity does not appear to be a primary differentiating factor for pre-eclampsia/eclampsia risk in most twin gestations.
    • The elevated risk of gestosis in twin pregnancy is greater than the sum of risks in two singleton pregnancies.
    • Increased conceptus-mother antigenic differences are suggested as a potential contributing factor to the higher incidence of pre-eclampsia/eclampsia in twin pregnancies.