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Placenta weight in pre-eclampsia.

Berit Dahlstrøm1, Pål Romundstad, Pål Øian

  • 1Faculty Division Akershus University Hospital, University of Oslo, Norway. berit.dahlstrom@ahus.no

Acta Obstetricia Et Gynecologica Scandinavica
|June 24, 2008
PubMed
Summary

Small placentas are linked to pre-eclampsia, particularly preterm pre-eclampsia. Term pre-eclampsia shows a U-shaped association with placenta weight, with both low and high weights being more common.

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Area of Science:

  • Obstetrics and Gynecology
  • Perinatal Medicine
  • Reproductive Health

Background:

  • Preterm and term pre-eclampsia may have distinct etiologies.
  • Placental characteristics, such as weight, could reflect these underlying differences.
  • Investigating placenta weight variations can offer insights into pre-eclampsia subtypes.

Purpose of the Study:

  • To compare placenta weight in pregnancies complicated by preterm or term pre-eclampsia with those in uncomplicated pregnancies.
  • To determine if placenta weight differences correlate with the timing of pre-eclampsia onset (preterm vs. term).

Main Methods:

  • A population-based study utilizing the Medical Birth Registry of Norway.
  • Inclusion of 317,688 singleton pregnancies from 1999-2004.
  • Comparison of placenta weight z-scores (adjusted for offspring sex and gestational length) across groups: no pre-eclampsia, preterm pre-eclampsia, and term pre-eclampsia.

Main Results:

  • Preterm pre-eclampsia was associated with significantly lower placenta weight (over-representation in the lowest weight tenths).
  • Term pre-eclampsia showed a U-shaped association with placenta weight, with over-representation in both the lowest and highest weight tenths.
  • Mean placenta weight z-score was higher in term pre-eclampsia compared to controls.

Conclusions:

  • Reduced placental weight is a significant finding in pre-eclampsia, more pronounced in preterm cases.
  • Term pre-eclampsia exhibits a complex relationship with placenta weight, involving both smaller and larger placentas.
  • These findings suggest distinct placental pathologies in different forms of pre-eclampsia.