Child neurodevelopment in a Bolivian mining city

Area of Science:

• Environmental health
• Pediatric neurodevelopment
• Toxicology

Background:

• Children living near mining industries may face risks from environmental contaminants.
• Prenatal exposure to trace elements can impact infant neurodevelopment.
• Assessing neurodevelopmental outcomes in vulnerable populations is crucial.

Purpose of the Study:

• To evaluate the neurodevelopment of infants exposed prenatally to mining-related trace elements.
• To determine the association between maternal blood trace element levels and infant neurodevelopmental outcomes.
• To investigate potential risks in children residing in a contaminated mining area.

Main Methods:

• Prospective cohort study in Oruro, Bolivia, recruiting pregnant women.
• Maternal blood trace element levels (including lead and antimony) measured pre-delivery.
• Infant neurodevelopment assessed using the Bayley Scales of Infant Development (BSID) at 10.5–12.5 months.
• Socioeconomic status and medical history collected via questionnaires.

Main Results:

• Maternal blood lead levels were low (geometric mean 1.76 μg/dL), comparable to non-contaminated areas.
• Antimony levels were relatively elevated (geometric mean 1.03 μg/dL).
• No significant mental or psychomotor abnormalities were detected in infants based on BSID scores.
• A positive association was observed between low maternal blood lead levels and higher infant BSID performance.

Conclusions:

• Women in the studied mining area showed low overall exposure to most trace elements, including lead.
• Infant neurodevelopmental outcomes were not adversely affected at the observed exposure levels.
• Unexpectedly, low-level prenatal lead exposure correlated with enhanced infant cognitive and psychomotor development.