Intervention
Medicolegal Pitfalls
- Failure to recognize lead poisoning might lead to irreversible neurologic deficit. The symptoms and signs of lead toxicity are subtle and easily overlooked, and the presenting clinical features are nonspecific. The radiologist may be the first to suggest the diagnosis when conventional radiographs are reviewed.
- In acute lead encephalopathy, brain edema occurs predominantly in the cerebellar vermis, which may act as a midline posterior fossa mass that occludes the fourth ventricle. This presentation may mimic that of brain tumor, which, if considered, may have disastrous consequences. The resultant transient obstructive hydrocephalus may require emergency drainage of cerebrospinal fluid. The hydrocephalus is transient, because the vermis edema subsides with medical treatment.
- Pappas et al reviewed a case of lead poisoning in a 9-month-old child.85 Obstructive hydrocephalus was clinically and radiographically in evidence at the time of presentation. Edema of the cerebellum sufficient to cause obstruction of the ventricular system represented a particularly unusual presentation of this disease process. The investigators reviewed the literature for similar cases of lead encephalopathy.
Special Concerns
- The persons most vulnerable to lead exposure are pregnant women, infants, and young children.
- Pregnant women may transfer their body burden of lead to the growing fetus, because there is no placental barrier to heavy metals. Because lead crosses the placenta throughout pregnancy, the fetus is at risk of lead poisoning. BLLs tend to remain constant throughout pregnancy in women who were previously exposed to lead, even if they are no longer exposed to lead. Further lead exposure may result in harm to the fetus.
- Lead in bone has implications for toxicology during pregnancy and lactation. Mobilization of lead from bone is likely to occur during periods of altered mineral metabolism. Because calciotropic factors determine the uptake and storage of lead in this compartment, changes in calcium-related regulatory factors are likely to affect lead compartmentalization.
- Calcium metabolism significantly changes during pregnancy and lactation. Although relatively little is known of lead kinetics during these critical periods, bone lead may be mobilized and transferred to the more bioavailable compartment of the maternal circulation, with potential toxic effects on the fetus and mother.86
- After birth, the child may continue to be exposed through the mother's milk.
- Children are especially at risk for exposure to lead by playing with painted toys, by repeatedly ingesting non-food substances, and by engaging in similar activities.
- The CDC has progressively lowered the BLLs of concern for lead exposure. Although the evidence is not definitive, several studies have demonstrated neurobehavioral impairment in lead-exposed children with BLLs as low as 10-14 mcg/dL, and there may not be a threshold. If 12% or more children in a given community have BLLs of 10 mcg/dL or higher (or if 27% or more of the housing stock is built before 1950), the CDC recommends universal screening; community-wide interventions should be considered by the appropriate agencies.
- Lead poisoning is a preventable condition that may affect almost every system of the body. The toxic effects include subtle, common childhood symptoms, but lead poisoning may also cause severe illness, leading to death. Lead poisoning may mimic common childhood illnesses.
- Clinicians need to be aware of the many sources of lead intoxication, particularly the use of folk remedies in ethnic minorities.
- Symptoms of lead encephalopathy may involve focal signs that mimic those of a cerebral or cerebellar neoplasm. The importance of good history taking cannot be overemphasized.
- Lead may have a deleterious effect on the CNS of a child when the BLL is as low as 0.48 µmol/L (10 mcg/dL). Lead-induced encephalopathy is a serious, end-stage disorder of lead poisoning that occurs when the BLL is around 3.86 µmol/L (80 mcg/dL).
- In adults, lead poisoning predominantly affects the peripheral nervous system; it usually manifests as peripheral neuropathy.
- Pearl and Boxt described a full-term asymptomatic child born with congenital lead poisoning secondary to maternal pica.87 Radiographic findings of an opaque cranial vault, lead lines, and delayed skeletal and deciduous dental development were noted at birth. After chelation therapy when the patient was 7 months old, radiographs revealed normal skeletal maturation. Tooth eruption did not occur until 15 months of age.
- Hu studied the long-term consequences of childhood plumbism among 35 survivors of lead poisoning from the period 1930-1944.88 The participants were interviewed, along with 22 control subjects matched for age, sex, and town of residence. The results suggested that women with a history of childhood lead poisoning may be at risk for spontaneous abortions or stillbirths and for having children with significant learning disabilities.
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Further Reading
Guidelines and clinical trials:
Preventing lead poisoning in young children. Centers for Disease Control and Prevention - Federal Government Agency [U.S.]
Department of Health and Human Services (U.S.) - Federal Government Agency [U.S.]
Public Health Service (U.S.). 2005 Aug. 101 pages. NGC:004567
Lead exposure in children: prevention, detection, and management. American Academy of Pediatrics. 2005 Oct. 11 pages. NGC:004538
Interpreting and managing blood lead levels <10 micrograms/dL in children and reducing childhood exposures to lead: recommendations of CDC's Advisory Committee on childhood lead poisoning prevention. Centers for Disease Control and Prevention - Federal Government Agency [U.S.]. 2007 Nov. 16 pages. NGC:006029
Screening for elevated blood lead levels in children and pregnant women: recommendation statement. United States Preventive Services Task Force - Independent Expert Panel. 1996 (revised 2006). 12 pages. NGC:005433
Penicillamine Chelation for Children With Lead Poisoning
The Combined Effect of 2,3-Dimercaptosuccinic Acid and Multi-Nutrients on Children in Lead Poisoning
Social Network Based Intervention to Reduce Lead Exposure Among Native American Children
Exposure, Dose, Body Burden and Health Effects of Lead
Randomized Study of Succimer (Dimercaptosuccinic Acid) on Growth of Lead-Poisoned Children
Does Lead Burden Alter Neuropsychological Development?
Lead Mobilization & Bone Turnover in Pregnancy/Lactation
Keywords
lead poisoning, plumbism, lead exposure, chronic lead nephropathy, chronic tubulointerstitial nephritis, acute lead poisoning, chronic lead nephropathy, lead hypertension, pica, lead intoxication, blood lead level, BLL, lead hypertension, lead chelation, osteosclerotic metaphyseal dysplasia, OMD
Follow-up: Lead Poisoning