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Severe Congenital Lead Poisoning in Siblings
Suganthinie Velagala1, Aditya Chhikara2, Jennifer Haile2,3
1Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut.
Insights
Congenital lead toxicity, though rare, poses significant risks to fetal development. This case highlights severe outcomes in siblings exposed to lead in utero, emphasizing the need for awareness and intervention.
Area of Science:
- Toxicology
- Pediatrics
- Obstetrics
Background:
- Congenital lead toxicity is uncommon but poses severe risks to fetal development.
- Lead readily crosses the placenta, endangering the fetus.
- Maternal lead exposure can result in spontaneous abortion, low birth weight, and neurodevelopmental impairments.
Purpose of the Study:
- To report a rare case of congenital lead toxicity in siblings.
- To illustrate the clinical course and management of severe lead exposure in neonates.
- To highlight the long-term developmental consequences in affected children.
Main Methods:
- Case report of a mother with pica behaviors and elevated lead levels.
- Treatment of the neonate with dimercaprol and Ca2Na2EDTA chelation therapy.
- Monitoring of blood lead levels in both mother and infants.
- Follow-up assessment of developmental outcomes in both children.
Main Results:
- The first infant presented with a high blood lead level (89 μg/dL) requiring intensive chelation therapy (dimercaprol and Ca2Na2EDTA), with a subsequent rebound.
- The second sibling, born prematurely, had a lower initial lead level (32 μg/dL) that trended down without chelation.
- Both children exhibited developmental delays and required early intervention services.
Conclusions:
- Congenital lead toxicity can lead to significant neurodevelopmental challenges, even after treatment.
- Pica behavior in pregnancy is a critical indicator for lead exposure screening.
- Early intervention is crucial for children affected by prenatal lead exposure.
Abstract:
Congenital lead toxicity is rare. Lead freely crosses the placenta, therefore, placing the developing fetus at a higher risk for lead toxicity. This can lead to adverse consequences, such as spontaneous abortion, low birth weight, low IQ, and neurodevelopmental impairment. We present a rare case of siblings born to a mother with pica behaviors. Her venous lead level was 42 μg/dL at the time of disclosure. The repeat venous level at delivery 2 weeks later was 61 μg/dL. The infant's venous level shortly after birth was 89 μg/dL. The neonate was transferred to the NICU, where he received 9 doses of intramuscular dimercaprol and 5 days of intravenous Ca2Na2EDTA. Seventy-two hours after completing chelation, the blood lead level rebounded to 46 μg/dL. A 19-day course of dimercaptosuccinic acid was then initiated. As of 12 months of age, he has not required additional chelation. Shortly after, the mother conceived another child, who was born prematurely at 29 weeks. Twelve days before delivery, the mother's lead level was 30 ug/dL. The infant's lead level was 32 ug/dL at the time of delivery. The infant's lead trended down without requiring chelation. Both children have since demonstrated developmental delays and have needed early intervention services.
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