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Monday, January 4, 2016

Anticholinergic Drugs Do Not Increase Dementia Risk in Parkinson’s

NEUROSCIENCE NEWS

Concern that anticholinergics could potentially worsen cognition in PD unfounded, according to new research reported in the Journal of Parkinson’s Disease.

Recent evidence has shown a greater risk of dementia, in particular Alzheimer’s disease (AD), in individuals using anticholinergic medications regularly. These drugs are widely used by older adults to treat bladder dysfunction, mood, and pain, and many of them are available without prescription. Since these drugs are often used to treat both motor symptoms and non-motor symptoms in patients with Parkinson’s Disease (PD), there is concern for increased risk of dementia. Contrary to expectations, a study in the current issue of the Journal of Parkinson’s Disease determined that the cognitive performance of PD patients taking anticholinergic medications did not differ from those who did notPrincipal investigator David J. Burn, Director of the Institute of Neuroscience and Professor of Movement Disorder Neurology at Newcastle University, UK, explained, “This is the first study to explore an association between anticholinergic burden and mild cognitive impairment (MCI) in PD participants, and is timely given recent research demonstrating cumulative anticholinergic burden and risk of AD in the general population. Our assessment will help determine whether patients prescribed medication with anticholinergic activity are more likely to develop dementia, and hence allow early targeted intervention to reduce future risk.”
Using data from the Incidence of Cognitive Impairment in Cohorts with Longitudinal Evaluation – Parkinson’s Disease study (ICICLE-PD), a twin center longitudinal observational study of the anatomical, biochemical, and genotypic mechanisms underlying the evolution of persons developing dementia (PDD), the investigators studied 195 PD patients and 84 control patients. The PD patients’ detailed medication history, including over-the-counter drugs, was evaluated according to the Anticholinergic Drug Scale (ADS). Each drug was classified on a scale from 0 to 3 according to no (0), mild (1), moderate (2) or high (3) anticholinergic activity. Total usage from baseline to 18-month follow up was used to produce a total burden score. Those with ADS scores greater than or equal to 1 were in the PD+ADS group while those with ADS scores equal to 0 were designated PD-ADS.
“This is the first study to explore an association between anticholinergic burden and mild cognitive impairment (MCI) in PD participants, and is timely given recent research demonstrating cumulative anticholinergic burden and risk of AD in the general population. Our assessment will help determine whether patients prescribed medication with anticholinergic activity are more likely to develop dementia, and hence allow early targeted intervention to reduce future risk.” Image is for illustrative purposes only.
Comparison of the PD+ADS (n = 83) and PD-ADS (n = 112) groups revealed no differences with respect to global cognition or assessments of attention, memory, and executive function at 18 months. The proportion of mild cognitive impairment (MCI) was similar in those with and without anticholinergic drug use. Although a greater proportion of PD subjects were taking anticholinergic medications, the total drug burden did not differ between the PD patients and controls.
ABOUT THIS PARKINSON’S DISEASE RESEARCH
Source: Daphne Watrin – IOS Press

Image Credit: The image is in the public domain

Original Research: Abstract for “Anticholinergic Load: Is there a Cognitive Cost in Early Parkinson’s Disease?” by Yarnall, Alison J., Lawson, Rachael A., Duncan, Gordon W., Breen, David P., Khoo, Tien K., Brooks, David, Barker, Roger A., Taylor, John-Paul, and Burn, David J. in Journal of Parkinson’s Disease. Published online December 21 2015 doi:10.3233/JPD-150664


Abstract

Anticholinergic Load: Is there a Cognitive Cost in Early Parkinson’s Disease?
We evaluated the effect of anticholinergic burden on 219 participants with incident Parkinson’s disease (PD) and 99 controls at study baseline and 18 months. Anticholinergic burden for each individual was calculated and summed according to the Anticholinergic Drug Scale (ADS). Medication with anticholinergic activity was more commonly prescribed in PD compared to controls, although mean ADS scores were not significantly different. Cognitive scores did not differ in PD participants taking medications with anticholinergic activity compared to those who were not. Low overall ADS scores due to increased awareness of adverse effects of medications and brevity of follow-up are potential explanations.
“Anticholinergic Load: Is there a Cognitive Cost in Early Parkinson’s Disease?” by Yarnall, Alison J., Lawson, Rachael A., Duncan, Gordon W., Breen, David P., Khoo, Tien K., Brooks, David, Barker, Roger A., Taylor, John-Paul, and Burn, David J. in Journal of Parkinson’s Disease. Published online December 21 2015 doi:10.3233/JPD-150664

http://neurosciencenews.com/parkinsons-dementia-anticholinergics-3343/

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