Evidence map›Paper›PMID 33445519›Full record

ArticleInternational journal of environmental research and public health2021

Prenatal Environmental Metal Exposure and Preterm Birth: A Scoping Review.

Rasheda Khanam, Ishaan Kumar, Opeyemi Oladapo-Shittu, Claire Twose, Asmd Ashraful Islam, Shyam S Biswal, Rubhana Raqib, Abdullah H Baqui

Open access · goldAbstract readScoping Review
In one paragraph

Article in International journal of environmental research and public health, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 46 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
46citing papers in PubMed, 2 pooled it
6.1field-weighted citation impact, top 3% 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

46 citing papers in PubMed, 2 syntheses or guidelines pooled it, 75 citations in OpenAlex.

  1. FIGO good practice recommendations on preconception care: A strategy to prevent preterm birth.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2025
    Guideline
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  14. Lead exposure at the feto-maternal interface: a cause for concern for fetal membrane trophoblasts.Toxicological sciences : an official journal of the Society of Toxicology · 2025
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  15. Joint effects of prenatal PMFrontiers in public health · 2025
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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

8 authors at 4 institutions in 2 countries.

Rasheda KhanamInternational Center for Maternal and Newborn Health, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.
Ishaan KumarDepartment of Chemistry, Georgetown University, Washington, DC 20057, USA.ORCID 0000-0002-6770-9933
Opeyemi Oladapo-ShittuInternational Center for Maternal and Newborn Health, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.ORCID 0000-0002-9845-8647
Claire TwoseWelch Medical Library, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Asmd Ashraful IslamProjahnmo Research Foundation, Dhaka 1213, Bangladesh.
Shyam S BiswalDepartment of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.
Rubhana RaqibInternational Center for Diarrheal Disease Research, Mohakhali, Dhaka 1212, Bangladesh.
Abdullah H BaquiInternational Center for Maternal and Newborn Health, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.
Johns Hopkins University · USBiomedical Research Foundation · BDGeorgetown University · USInternational Centre for Diarrhoeal Disease Research · BD

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Preterm birth (PTB) and its complications are the leading causes of under-five year old child deaths, accounting worldwide for an estimated one million deaths annually. The etiology of PTB is complex and multifactorial. Exposures to environmental metals or metalloids are pervasive and prenatal exposures to them are considered important in the etiology of PTB. We conducted a scoping review to determine the extent of prenatal exposures to four metals/metalloids (lead, mercury, cadmium and arsenic) and their association with PTB. We reviewed original research studies published in PubMed, Embase, the Cochrane Library, Scopus, POPLINE and the WHO regional indexes from 2000 to 2019; 36 articles were retained for full text review. We documented a higher incidence of PTB with lead and cadmium exposures. The findings for mercury and arsenic exposures were inconclusive. Metal-induced oxidative stress in the placenta, epigenetic modification, inflammation, and endocrine disruptions are the most common pathways through which heavy metals and metalloids affect placental functions leading to PTB. Most of the studies were from the high-income countries, reflecting the need for additional data from low-middle-income countries, where PTB rates are higher and prenatal exposure to metals are likely to be just as high, if not higher.

Indexed as

MercuryMetals, HeavyPremature BirthCadmiumChildChild, PreschoolEnvironmental ExposureFemaleHumansInfant, NewbornPregnancyCadmiumMercuryMetals, Heavyarseniccadmiumleadmercuryprenatal exposurepreterm birthscoping review

Identifiers

PMID33445519
PMCPMC7827269
OpenAlexW3119148055

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.