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Inter-pregnancy interval and risk of recurrent pre-eclampsia: systematic review and meta-analysis.

TitleInter-pregnancy interval and risk of recurrent pre-eclampsia: systematic review and meta-analysis.
Publication TypeJournal Article
Year of Publication2016
AuthorsCormick, G, Betrán, A, Ciapponi, A, Hall, D, Hofmeyr, J
Corporate AuthorsCalcium and Pre-eclampsia Study Group
JournalReprod Health
Date Published2016 Jul 18
KeywordsAdult, Birth Intervals, CAP, Cohort Studies, Databases, Factual, Eclampsia, Electronic Health Records, Evidence-Based Medicine, Female, Humans, Male, Observational Studies as Topic, Pre-Eclampsia, Pregnancy, Recurrence, Risk, Secondary Prevention, Sexual Partners

BACKGROUND: Women with a history of pre-eclampsia have a higher risk of developing pre-eclampsia in subsequent pregnancies. However, the role of the inter-pregnancy interval on this association is unclear.

OBJECTIVE: To explore the effect of inter-pregnancy interval on the risk of recurrent pre-eclampsia or eclampia.

SEARCH STRATEGY: MEDLINE, EMBASE and LILACS were searched (inception to July 2015).

SELECTION CRITERIA: Cohort studies assessing the risk of recurrent pre-eclampsia in the immediate subsequent pregnancy according to different birth intervals.

DATA COLLECTION AND ANALYSIS: Two reviewers independently performed screening, data extraction, methodological and quality assessment. Meta-analysis of adjusted odds ratios (aOR) with 95 % confidence intervals (CI) was used to measure the association between various interval lengths and recurrent pre-eclampsia or eclampsia.

MAIN RESULTS: We identified 1769 articles and finally included four studies with a total of 77,561 women. The meta-analysis of two studies showed that compared to inter-pregnancy intervals of 2-4 years, the aOR for recurrent pre-eclampsia was 1.01 [95 % CI 0.95 to 1.07, I(2) 0 %] with intervals of less than 2 years and 1.10 [95 % CI 1.02 to 1.19, I(2) 0 %] with intervals longer than 4 years.

CONCLUSION: Compared to inter-pregnancy intervals of 2 to 4 years, shorter intervals are not associated with an increased risk of recurrent pre-eclampsia but longer intervals appear to increase the risk. The results of this review should be interpreted with caution as included studies are observational and thus subject to possible confounding factors.

Alternate JournalReprod Health
Citation Key447
PubMed ID27430353
PubMed Central IDPMC4950816
Grant List001 / / World Health Organization / International