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Cognition in individuals at risk for Parkinson's: Parkinson associated risk syndrome (PARS) study findings
Author(s) -
Chahine Lama M.,
Weintraub Daniel,
Hawkins Keith A.,
Siderowf Andrew,
Eberly Shirley,
Oakes David,
Seibyl John,
Stern Matthew B.,
Marek Kenneth,
Jennings Danna
Publication year - 2016
Publication title -
movement disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.352
H-Index - 198
eISSN - 1531-8257
pISSN - 0885-3185
DOI - 10.1002/mds.26373
Subject(s) - hyposmia , psychology , cognition , odds ratio , cohort , working memory , psychiatry , medicine , disease , covid-19 , infectious disease (medical specialty)
Abstract Objectives The Parkinson Associated Risk Syndrome Study identified a cohort of healthy adults with hyposmia and dopamine transporter binding reduction to characterize individuals at risk for Parkinson's disease (PD). We describe the cognitive profile of this cohort. Methods Individuals older than 50 y without PD were recruited. Two hundred twenty‐five completed cognitive testing and were included in the final analysis. A neuropsychological test battery was administered and normative scores created for global cognition, memory, executive function/working memory, processing speed/attention, visuospatial abilities, and language domains. Other non‐motor symptoms (constipation, depression, anxiety, and rapid eye movement sleep behavior disorder) were assessed through questionnaires. Results Individuals with both hyposmia and reduced dopamine transporter binding (n = 38) had lower mean scores for global cognition, executive function/working memory, and memory compared with all other participants (n = 187). In separate multivariate logistic regression models, lower global cognition (odds ratio, 1.97, P = 0.004), and specifically executive function/working memory (odds ratio, 1.84, P = 0.004) scores were associated with membership in the hyposmia with dopamine transporter reduction group. Combining hyposmia with relative impairment on specific cognitive domains increased the odds of dopamine transporter binding reduction compared with hyposmia alone, with the greatest increase in odds for hyposmia plus executive function/working memory relative impairment (68% increase in odds from 4.14 to 6.96). Conclusion Changes in global cognitive abilities, and specifically executive function/working memory, are present in individuals at risk for PD. Combining non‐motor features, including cognition, improves prediction of dopamine transporter binding reduction. © 2015 International Parkinson and Movement Disorder Society