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Very low lead exposures and children's neurodevelopment

David C Bellinger1

  • 1Children's Hospital Boston, Harvard Medical School, Harvard School of Public Health, Boston, Massachusetts 02115, USA. david.bellinger@childrens.harvard.edu

Current Opinion in Pediatrics
|March 12, 2008
PubMed

Insights

No safe blood lead level exists for children. Even low exposure levels are linked to neurodevelopmental deficits, underscoring the need for primary prevention strategies to protect child health.

Area of Science:

  • Environmental Health
  • Neuroscience
  • Pediatrics

Background:

  • Lead exposure continues to pose a significant threat to children's neurodevelopment.
  • Current screening guidelines for blood lead levels (BLLs) are being re-evaluated based on emerging evidence.
  • Eliminating lead-associated neurodevelopmental morbidities remains a critical public health goal.

Purpose of the Study:

  • To evaluate the scientific basis for reducing the Centers for Disease Control and Prevention's (CDC) screening guideline for blood lead levels.
  • To review current evidence on the neurodevelopmental effects of lead exposure in children at various BLLs.

Main Methods:

  • Systematic review of recent scientific literature.
  • Analysis of studies investigating neurodevelopmental outcomes at different blood lead levels.
  • Evaluation of functional imaging and therapeutic intervention data.

Main Results:

  • Adverse neurodevelopmental outcomes, including reduced IQ and academic deficits, are observed at BLLs below 10 microg/dl.
  • Increased lead exposure is associated with neuropsychiatric disorders like attention deficit hyperactivity disorder (ADHD) and antisocial behavior.
  • Functional imaging studies are providing insights into the neural mechanisms underlying lead's neurotoxic effects.

Conclusions:

  • No safe threshold for lead exposure has been identified; even low BLLs are associated with neurodevelopmental deficits.
  • Current chelation therapy protocols are largely ineffective in preventing lead-induced neurodevelopmental harm.
  • Primary prevention of lead exposure is the most effective strategy for mitigating its adverse health impacts in children.
Abstract

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