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Clinical

ADHD may increase risk of neurodegenerative diseases

Staff Writer
Staff Writer 4 years ago
Updated 2019/09/11 at 10:44 PM
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In a recent study, researchers at the University of Utah Health studied the long-term effects of attention deficit hyperactivity disorder (ADHD) and its associated pharmaceutical treatment: stimulants.

According to the study, ADHD, along with the use of stimulants, like Ritalin, may increase the risk of developing Parkinson’s or similar diseases. “This may be the first time where a childhood disease and its treatment may be linked to a geriatric expression of neurodegenerative disorder,” said Glen Hanson, a professor of Pharmacology and Toxicology at U of U Health.

ADHD is characterized by impulsivity, attention deficit, and hyperactivity. As of 2017, nearly 6.5 million children have been diagnosed with the neurodevelopmental disorder in the U.S.; a 42 percent increase over the past 8 years.

For the study, statewide medical records of 31,769 patients with ADHD, collected between 1996 to 2016, were examined based on the Utah Population Database. 4,960 of those participants were administered stimulants. The sample was then compared to a non-ADHD population of 158,790 participants with similar age and gender. All participants chosen had no prior history of neurodegenerative disease or substance misuse.

The findings showed that ADHD patients were more than twice as likely to develop early-onset Parkinson’s and Parkinson-like diseases compared to the non-ADHD group of the same age and gender. Moreover, the risk for patients who were prescribed stimulants was 6 to 8 times higher.

“If we were to follow 100,000 adults over time, in one year we would expect 1 to 2 people will develop Parkinson’s disease before age 50,” said Karen Curtin, co-author of the study. “If we were to follow 100,000 adults prescribed treatment for ADHD over time, we estimate that over a year 8 to 9 patients will develop Parkinson’s disease before age 50.”

Researchers note that although the study adds to previous findings, which have linked stimulant misuse to the onset of neurodegeneration, the results are preliminary and require further research.

“The study results should be considered preliminary. This study may be limited by the misclassification of non-ADHD subjects, who were diagnosed with the disorder outside of Utah, missed or incorrect diagnosis of Parkinson-like disease symptoms and the lack of information on the duration of use and dosage of ADHD medication prescribed,” said Stacy Kish, a science writer at U and U Health, in a press release.

The findings were published in the journal Neuropsychopharmacology.

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TAGGED: adhd, neurodegeneration, parkinson's disease
Staff Writer September 14, 2018
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