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Fetal Exposure to Methamphetamine May Harm Child's Brain
Date:4/15/2009

Scans show neurological differences in toddlers born to drug abusers

WEDNESDAY, April 15 (HealthDay News) -- In what researchers are calling the first study of its kind, methamphetamine use among pregnant women has been found to prompt abnormal brain development among young children exposed to the drug in the womb.

Whether those changes translate into longer-term troubles remains to be seen, one expert said.

"If we accept the conclusion here that prenatal methamphetamine use does affect the young child's brain development, then the next step is to look at what the consequences could be in real terms," said Dr. James Garbutt, M.D., a professor of psychiatry at the University of North Carolina at Chapel Hill.

Garbutt was not involved in the research, which was led by Dr. Linda Chang and Christine C. Cloak, both of the department of medicine at the University of Hawaii at Manoa, in Honolulu. They published the findings in the April online issue of Neurology.

According to the U.S. National Institute on Drug Abuse, methamphetamine is an extremely addictive and easily abused stimulant that targets the central nervous system by prompting the release of large amounts of the brain chemical dopamine. The agency notes that, as of 2006, there were an estimated 731,000 American methamphetamine users over the age of 12.

Prior research has suggested that prenatal exposure to the drug appears to result in the development of poorer motor skills and higher stress levels among infants and young children, the Hawaiian researchers noted.

But to better explore the issue, the research team used high-tech "diffusion-tensor" magnetic resonance imaging (DTI) to scan the brains of 29 children between the ages of 3 and 4, all of who had been exposed to the drug in utero. Those images were then compared to scans taken of 37 similarly aged children with no such exposure.

By mapping out microscopi
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