Evidence map›Paper›PMID 33870708›Full record

SynthesisJournal of the American Heart Association2021

Impact of Chronic Hypertension and Antihypertensive Treatment on Adverse Perinatal Outcomes: Systematic Review and Meta-Analysis.

Sukainah Y Al Khalaf, Éilis J O'Reilly, Peter M Barrett, Debora F B Leite, Lauren C Pawley, Fergus P McCarthy, Ali S Khashan

Open access · goldAbstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in Journal of the American Heart Association, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 42 papers, 5 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
42citing papers in PubMed, 5 pooled it
8.8field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

42 citing papers in PubMed, 5 syntheses or guidelines pooled it, 69 citations in OpenAlex.

  1. Pooled it
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  4. Optimal blood pressure target to prevent severe hypertension in pregnancy: A systematic review and meta-analysis.Hypertension research : official journal of the Japanese Society of Hypertension · 2022
    Pooled it
  5. Pooled it
  6. Journal of cell communication and signaling · 2026
    Article
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  14. Does geographical location impact the efficacy of oral antihypertensive therapy in pregnancy?Journal of the Turkish German Gynecological Association · 2025
    Article
  15. Kidney disease and reproductive health.Nature reviews. Nephrology · 2025
    Review
  16. Review
  17. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 3 institutions in 3 countries.

Sukainah Y Al KhalafSchool of Public Health University College Cork Cork Ireland.
Éilis J O'ReillySchool of Public Health University College Cork Cork Ireland.
Peter M BarrettSchool of Public Health University College Cork Cork Ireland.
Debora F B LeiteFederal University of Pernambuco Recife Brazil.
Lauren C PawleyDepartment of Anatomy and Neuroscience University College Cork Cork Ireland.
Fergus P McCarthyINFANT Research Centre University College Cork Ireland.
Ali S KhashanSchool of Public Health University College Cork Cork Ireland.
University College Cork · IEHarvard University · USUniversidade Federal de Pernambuco · BR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Background Maternal chronic hypertension is associated with adverse pregnancy outcomes. Previous studies examined the association between either chronic hypertension or antihypertensive treatment and adverse pregnancy outcomes. We aimed to synthesize the evidence on the effect of chronic hypertension/antihypertensive treatment on adverse pregnancy outcomes. Methods and Results Medline/PubMed, EMBASE, and Web of Science were searched; we included observational studies and assessed the effect of race/ethnicity, where possible, following a registered protocol (CRD42019120088). Random-effects meta-analyses were used. A total of 81 studies were identified on chronic hypertension, and a total of 16 studies were identified on antihypertensive treatment. Chronic hypertension was associated with higher odds of preeclampsia (adjusted odd ratio [aOR], 5.43; 95% CI, 3.85-7.65); cesarean section (aOR, 1.87; 95% CI, 1.6-2.16); maternal mortality (aOR, 4.80; 95% CI, 3.04-7.58); preterm birth (aOR, 2.23; 95% CI, 1.96-2.53); stillbirth (aOR, 2.32; 95% CI, 2.22-2.42); and small for gestational age (SGA) (aOR, 1.96; 95% CI, 1.6-2.40). Subgroup analyses indicated that maternal race/ethnicity does not influence the observed associations. Women with chronic hypertension on antihypertensive treatment (versus untreated) had higher odds of SGA (aOR, 1.86; 95% CI, 1.38-2.50). Conclusions Chronic hypertension is associated with adverse pregnancy outcomes, and these associations appear to be independent of maternal race/ethnicity. In women with chronic hypertension, those on treatment had a higher risk of SGA, although the number of studies was limited. This could result from a direct effect of the treatment or because severe hypertension during pregnancy is a risk factor for SGA and women with severe hypertension are more likely to be treated. The effect of antihypertensive treatment on SGA needs to be further tested with large randomized controlled trials.

Indexed as

Antihypertensive AgentsFemaleHumansInfant, NewbornPre-EclampsiaPregnancyPregnancy OutcomeRisk FactorsAntihypertensive Agentsantihypertensivechronic hypertensionfetal outcomemeta‐analysisneonatal outcomepregnancysystematic review

Identifiers

PMID33870708
PMCPMC8200761
OpenAlexW3156868799

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.