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Pros and Cons of Therapy for Lead Exposure

Lead chelation therapy -- a chemical treatment to remove lead from the body -- can significantly reduce learning and behavioral problems that result from lead exposure, a// Cornell study of young rats finds.

However, in a further finding that has implications for the treatment of autistic children, the researchers say that when rats with no lead in their systems were treated with the lead-removing chemical, they showed declines in their learning and behavior that were similar to the rats that were exposed to lead.

Chelating drugs, which bind to lead and other metals in the blood, are increasingly being used for the treatment of autism in children.

"Although these drugs are widely used to treat lead-exposed children, there is remarkably little research on whether or not they improve cognitive outcomes, the major area of concern in relation to childhood lead poisoning," said Barbara Strupp, Cornell associate professor of nutritional sciences and of psychology and the senior author of the study, which was published in a recent issue of Environmental Health Perspectives.

Studies on the safety or effectiveness of the drugs for treating autism are similarly lacking, Strupp said.

Strupp added that to her knowledge this is the first report that shows that chelation therapy can reduce behavioral and learning problems due to lead exposure as well as the first to show that this type of treatment can have lasting adverse effects when administered in the absence of elevated levels of heavy metals.

The study used succimer (brand name, Chemet), the most widely prescribed drug for the treatment of lead poisoning. Doctors prefer succimer to other such drugs because it can be given orally on an outpatient basis, and it leaches less zinc, iron and other essential minerals out of the body. Although the Centers for Disease Control recommends chelation therapy only for children whose blood lead levels exceed 45 micro
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