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Pharmacology Environmental Toxicology Intermediate
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Lead Poisoning Manifestations: LEAD

LEAD
LINES
Clinical signs of environmental lead toxicity in pediatric and occupational populations.

Lead binds to sulfhydryl groups on enzymes, directly inhibiting ferrochelatase and delta-aminolevulinic acid dehydratase (ALA-D) in heme biosynthesis, causing microcytic sideroblastic anemia and direct neurotoxicity.

Systematic Breakdown

L

Lead Lines on Gingiva & Metaphyses

Burton lines (blue-purple lines along gum-tooth margin from lead sulfide precipitation) and dense radiopaque bands on long bone metaphyses.

E

Encephalopathy & Erythrocyte Basophilic Stippling

Headache, memory loss, seizures, coma in children; coarse blue ribonucleic acid precipitates on peripheral blood smear.

A

Anemia (Microcytic Sideroblastic) & Abdominal Colic

Inhibition of heme synthesis leading to anemia and severe episodic colicky abdominal pain.

D

Drop (Wrist & Foot Drop)

Motor peripheral neuropathy predominantly affecting the radial nerve (wrist drop) and peroneal nerve (foot drop).

High-Yield Clinical Pearls & Exam Tips
  • First-line chelating agents: Succimer (oral DMSA) for children with blood lead levels 45-69 mcg/dL; Dimercaprol (BAL) + IV Calcium Disodium EDTA for acute encephalopathy (>70 mcg/dL).
  • Children absorb ~50% of ingested lead compared to ~10% in adults; lead easily crosses the blood-brain barrier in developing brains causing permanent cognitive deficits.
Related Pharmaceuticals
Succimer Calcium Disodium EDTA Dimercaprol
Related Clinical Conditions
Lead Toxicity Sideroblastic Anemia Radial Neuropathy
Authoritative Sources: Goldfrank's Toxicologic Emergencies 11e · AAP Policy Statement: Prevention of Childhood Lead Toxicity

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