Preterm birth risk strongly linked to pre-eclampsia

Date:
December 9, 2021
Source:
Curtin University
Summary:
Women who gave birth to a premature baby after developing
pre-eclampsia were 17 times more likely to experience another
preterm birth if pre- eclampsia emerged again, new research
has found.



FULL STORY ========================================================================== Women who gave birth to a premature baby after developing pre-eclampsia
were 17 times more likely to experience another preterm birth if
pre-eclampsia emerged again, new Curtin University research has found.


==========================================================================
The study, published in the British Journal of Obstetrics and Gynaecology, examined more than 125,000 women who experienced two consecutive singleton births in Western Australia from 1998 to 2015.

About 27,000 babies are born prematurely -- or before 37 weeks' gestation
- - across Australia each year, with preterm birth the leading cause
of death and morbidity in children up to five years of age in the
developed world.

Lead author and PhD candidate Jennifer Dunne, from Curtin's School of Population Health, said the findings showed the strongest link between
preterm birth and pregnancies complicated by pre-eclampsia, a serious
pregnancy condition that is usually characterised by high blood pressure, protein in the urine and severe swelling.

"When both pregnancies were complicated by pre-eclampsia, the risk of a subsequent preterm birth increased 10-fold after an initial term birth
and 17- fold when the first birth was preterm, compared to women who
had an uncomplicated first pregnancy," Ms Dunne said.

"This study also found that there was a three-fold higher risk of women experiencing a subsequent case of pre-eclampsia after a preterm birth
in the first pregnancy that was not complicated by pre-eclampsia.

"Until recently, a first birth at full term was considered a reduced risk
for a preterm delivery in the next pregnancy. However, there is emerging evidence that a complicated first pregnancy, regardless of whether the
baby was delivered early or at full term, increases the subsequent risk
of a baby being born prematurely." Ms Dunne said the main pregnancy complications examined included pre-eclampsia, placental abruption (the detachment from the wall of the womb), small-for- gestational age and
perinatal death (a stillbirth or a neonatal death in the first 28 days).

"Having any of the four complications in their first pregnancy puts
women at an increased risk of a preterm birth in their next pregnancy, regardless of whether that first birth ended at full term or preterm,"
Ms Dunne said.

"Likewise, women whose first pregnancy ended in a preterm delivery were at
an increased risk for each pregnancy complication in the second pregnancy.

"The findings of this study will help clinicians to better identify
women who are at an increased risk of a either a preterm birth or
complications in their subsequent pregnancies. Further research is
now needed to reveal the specific pathways that explain these strong
links between pregnancy complications and preterm births, whether they
be genetic, pathological, and behavioural or other recurrent issues."
The research was supervised by Professor Gavin Pereira and co-authored
by Dr Gizachew Tessema, also from Curtin's School of Population Health.

========================================================================== Story Source: Materials provided by Curtin_University. Original written
by Yasmine Phillips.

Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. J Dunne, GA Tessema, G Pereira. The role of confounding in the
association between pregnancy complications and subsequent preterm
birth: a cohort study. BJOG: An International Journal of Obstetrics
& Gynaecology, 2021; DOI: 10.1111/1471-0528.17007 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2021/12/211209095624.htm

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