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Fetal lead exposure at each stage of pregnancy as a predictor of infant mental development

Howard Hu1, Martha María Téllez-Rojo, David Bellinger

  • 1Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA. howardhu@umich.edu

Environmental Health Perspectives
|November 17, 2006
PubMed

Insights

Prenatal lead exposure negatively impacts infant neurodevelopment, particularly during the first trimester. Measuring maternal blood or plasma lead in early pregnancy best identifies this risk.

Area of Science:

  • Environmental Health
  • Neurodevelopmental Toxicology
  • Reproductive Health

Background:

  • Prenatal lead exposure's effects on neurodevelopment are not fully understood.
  • Key uncertainties include the most vulnerable period and optimal exposure assessment methods.

Purpose of the Study:

  • To investigate the impact of prenatal lead exposure on neurodevelopment.
  • To assess the relationship using repeated maternal blood and plasma lead measurements.

Main Methods:

  • Maternal whole blood and plasma lead levels were measured across trimesters.
  • Umbilical cord blood lead and offspring blood lead at 12 and 24 months were assessed.
  • The Bayley Scales of Infant Development were administered to offspring; multivariate regression was used for analysis.

Main Results:

  • First-trimester maternal plasma and whole blood lead levels significantly predicted lower Mental Development Index (MDI) scores.
  • First-trimester plasma lead showed a stronger association with MDI scores than whole blood lead or lead levels in later trimesters.
  • A 1-SD increase in first-trimester plasma lead was linked to a 3.5-point decrease in MDI scores.

Conclusions:

  • Fetal lead exposure adversely affects neurodevelopment.
  • The first trimester appears to be the most sensitive period for lead's neurodevelopmental impact.
  • Maternal plasma or whole blood lead measurements during early pregnancy are effective for assessing fetal lead dose.
Abstract

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