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[Blood lead in a population of children with iron deficiency]
M J Redondo Granado1, F J Alvarez Guisasola, A Blanco Quirós
1Departamento de Pediatría, Hospital Universitario, Valladolid.
Insights
Iron deficiency in children significantly increases blood lead levels and the risk of lead poisoning. Iron therapy effectively reduces these lead levels, highlighting iron status as a critical factor in childhood lead exposure.
Area of Science:
- Pediatric Environmental Health
- Nutritional Toxicology
- Hematology
Background:
- Iron metabolism plays a crucial role in children's health.
- Understanding the relationship between iron status and environmental toxin exposure is vital.
Purpose of the Study:
- To investigate the association between iron deficiency and blood lead levels in children.
- To evaluate the impact of iron therapy on blood lead levels.
Main Methods:
- Cross-sectional study of 89 iron-deficient children and 41 controls (ages 6 months-14 years).
- Subgroup analysis of iron-deficient children with and without anemia.
- Longitudinal assessment of blood lead levels before and after iron therapy in 18 children.
Main Results:
- Iron-deficient children had significantly higher blood lead levels (9.41 µg/dL) compared to controls (6.88 µg/dL).
- Children with iron deficiency anemia showed markedly elevated blood lead levels (12.30 µg/dL).
- Lead poisoning prevalence was higher in iron-deficient children (8%) versus controls (0%), decreasing significantly after iron therapy.
Conclusions:
- Iron deficiency is a significant predisposing factor for lead poisoning in children.
- Iron repletion can effectively lower blood lead levels in deficient children.
- Monitoring iron status is crucial for managing lead exposure risks in pediatric populations.
Background:
Analysis of blood lead levels in relation to the state of iron metabolism was carried out in children.
Methods:
A transversal study of blood lead levels was designed in 89 iron deficient children (serum ferritin < 15 micrograms/l) (group F). Fifty seven of the children did not have anemia (sub-group FS) and 32 had anemia (sub-group AF) with ages ranging between 6 months and 14 years, and 41 children of the same age with normal iron metabolism (group C). A longitudinal study was also carried out by the determination of blood lead levels prior and after iron therapy in 18 of the iron deficient children.
Results:
A significant difference was seen between the mean of blood lead levels in iron deficient children (group F), 9.41 micrograms/dl and normal children (group C), 6.88 micrograms/dl (p < 0.01). The mean of blood lead levels of the sub-group FS was 7.79 micrograms/dl and the sub-group AF, 12.30 micrograms/dl (p < 0.01). The prevalence of lead poisoning (blood lead levels > 20 micrograms/dl) was 8% in group F (2% in sub-group FS, 19% in sub-group AF) and 0 in group C (p < 0.01). A significant decrease was found in the longitudinal study in the mean of blood lead levels following iron therapy from 14.12 micrograms/dl to 7.51 micrograms/dl (p < 0.05).
Conclusions:
The iron deficient state may constitute a predisposing factor of lead poisoning in childhood.