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Moderate lead poisoning: trends in blood lead levels in unchelated children
M E Markowitz1, P E Bijur, H A Ruff
1Department of Pediatrics, Albert Einstein College of Medicine, Bronx, NY 10467, USA.
Insights
Comprehensive intervention programs effectively lower blood lead (Pb) levels in moderately poisoned children, even without chelation therapy. Environmental remediation and education significantly reduce lead exposure risks over six months.
Area of Science:
- Pediatric Environmental Health
- Toxicology
- Public Health Interventions
Background:
- Clinical management of moderate childhood lead (Pb) poisoning requires further investigation.
- Understanding blood Pb (BPb) level changes without chelation therapy is crucial for effective treatment strategies.
Purpose of the Study:
- To determine the pattern of blood lead (BPb) level changes in moderately poisoned children over six months.
- To assess the impact of a comprehensive intervention program, excluding chelation therapy, on BPb levels.
- To evaluate the correlation between home environmental scores (HES) and BPb levels.
Main Methods:
- Followed 79 moderately Pb-poisoned children (initial BPb 1.21-2.66 mumol/l) for 6 months with repeated BPb measurements.
- Interventions included health department notification for hazard remediation, educational outreach, and iron therapy for iron deficiency.
- Quantified lead paint hazards using a home environmental score (HES) combining visual assessment and X-ray fluorescence (XRF).
Main Results:
- Blood Pb (BPb) levels declined by an average of 27% over the 6-month study period.
- Home environmental scores (HES) decreased significantly, but only 20% of children achieved a score of 0.
- BPb levels fell despite ongoing lead exposure and iron deficiency, indicating intervention effectiveness.
Conclusions:
- A comprehensive intervention program, including environmental remediation and education, can effectively lower blood lead (BPb) levels in moderately poisoned children.
- The home environmental score (HES) is a valuable tool for quantifying lead hazards and its correlation with BPb is significant prior to intervention.
- Clinical management can achieve significant BPb reduction without chelation therapy, highlighting the importance of environmental and educational strategies.
Abstract:
The appropriate clinical management of children who are moderately poisoned with lead (Pb) is under active investigation. To determine the pattern of change in blood Pb (BPb) levels in the absence of chelation therapy, we followed moderately Pb-poisoned children (initial blood Pb levels 1.21-2.66 mumol/l or 25-55 micrograms/dl) for 6 months with repeated BPb level measurements. Chelation therapy was not administered because all the children had negative lead mobilization tests indicating limited response to the chelating agent, calcium disodium edetate (CaNa2EDTA). Eligible children received the following interventions: notification of the health department to remediate lead hazards; reinforced educational efforts about the toxicity sources and treatment of Pb during 10 clinic and 3 home visits; and iron therapy for children with ferritin levels less than 16 micrograms/l. To quantify the lead paint hazards in the home, we combined a visual rating of the surfaces (intact to peeling) with an X-ray fluorescence (XRF) measurement of the lead content of the painted surface. The sum of these assessments is termed the home environmental score (HES). Data were analyzed from 79 children. BPb levels declined by 27%, on average, over 6 months. HES was correlated with BPb at enrollment, but neither the initial nor later HES measurements predicted BPb at other time points. The HES was highest at enrollment and declined by 50% and 75% at the second and third home visits, respectively. However, only a minority of the children (20%) achieved an HES of 0, indicating no lead paint hazards at home. Despite some ongoing Pb exposure, a parallel fall in BPb levels was observed in subgroups of children with either initially low or high HES (above or below the median HES of 37). Iron status did not account for the change in BPb levels. These data provide evidence that our measure, the HES, is quantifiably related to BPb levels in children, that this correlation is significant only prior to intervention; and that BPb levels decline in children who are moderately poisoned with Pb after they are enrolled in a comprehensive intervention program, even in the absence of chelation therapy and in the presence of ongoing lead paint exposure and Fe deficiency.