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Henrik U Irgens Medical Birth Registry of Norway, Locus for Registry
Based Epidemiology, Department of Public Health and Primary Health
Care, University of Bergen, Haukeland Hospital, N5021 Bergen, Norway
Correspondence to: L M Irgens lorentz.irgens{at}mfr.uib.no
Objective:
To assess whether mothers and fathers have a higher long term risk of death, particularly from cardiovascular disease and cancer, after the mother has had pre-eclampsia.
What is already known on this topic
What this study adds
Design:
Population based cohort study of registry data.
Subjects:
Mothers and fathers of all 626 272
births that were the mothers' first deliveries, recorded in the
Norwegian medical birth registry from 1967 to 1992. Parents were
divided into two cohorts based on whether the mother had pre-eclampsia during the pregnancy. Subjects were also stratified by whether the
birth was term or preterm, given that pre-eclampsia might be more
severe in preterm pregnancies.
Main outcome measures:
Total mortality and
mortality from cardiovascular causes, cancer, and stroke from 1967 to
1992, from data from the Norwegian registry of causes of death.
Results:
Women who had pre-eclampsia had a
1.2-fold higher long term risk of death (95% confidence interval 1.02 to 1.37) than women who did not have pre-eclampsia. The risk in women with pre-eclampsia and a preterm delivery was 2.71-fold higher (1.99 to
3.68) than in women who did not have pre-eclampsia and whose
pregnancies went to term. In particular, the risk of death from
cardiovascular causes among women with pre-eclampsia and a preterm
delivery was 8.12-fold higher (4.31 to 15.33). However, these women had
a 0.36-fold (not significant) decreased risk of cancer. The long term
risk of death was no higher among the fathers of the pre-eclamptic
pregnancies than the fathers of pregnancies in which pre-eclampsia did
not occur.
Conclusions:
Genetic factors that increase the
risk of cardiovascular disease may also be linked to pre-eclampsia. A possible genetic contribution from fathers to the risk of pre-eclampsia was not reflected in increased risks of death from cardiovascular causes or cancer among fathers.
Maternal and fetal genes (including those inherited from the
father) may contribute to pre-eclampsia, which occurs in 3-5% of
pregnancies
Women who have pre-eclampsia during a pregnancy that ends in a preterm
delivery have an eightfold higher risk of death from cardiovascular
disease compared with women who do not have pre-eclampsia and whose
pregnancy goes to term
© BMJ 2001
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