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Cognition and the course of prodromal Parkinson's disease
Author(s) -
Weintraub Daniel,
Chahine Lana M.,
Hawkins Keith A.,
Siderowf Andrew,
Eberly Shirley,
Oakes David,
Seibyl John,
Stern Matthew B.,
Marek Kenneth,
Jennings Danna
Publication year - 2017
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.27189
Subject(s) - hyposmia , cognitive decline , cognition , psychology , dopamine transporter , neuropsychology , parkinson's disease , population , dementia , psychiatry , audiology , medicine , disease , neuroscience , dopamine , dopaminergic , environmental health , covid-19 , infectious disease (medical specialty)
Background Prospective data on cognition in prodromal Parkinson's disease are limited. The objectives of this study were to assess in prodromal PD (1) if baseline cognition predicts conversion to clinical PD, (2) if baseline dopamine transporter binding predicts longitudinal changes in cognition, and (3) if impaired olfaction predicts future cognitive decline. Methods Prodromal participants were 136 hyposmic individuals enrolled in the Parkinson Associated Risk Study. We examined baseline neuropsychological test performance in PD converters versus nonconverters and the association between baseline dopamine transporter binding and change in cognition. An additional 73 normosmic individuals were included in analyses of the relationship between hyposmia and cognitive decline. Results In prodromal participants, baseline cognitive scores did not significantly predict conversion, but converters performed numerically worse on 5 of the 6 cognitive domains assessed, with the greatest differences in executive function/working memory (0.68 standard deviation lower) and global cognition (0.64 standard deviation lower). Lower baseline dopamine transporter binding predicted greater future decline in processing speed/attention ( P = 0.02). Hyposmia predicted greater future decline in language ( P = 0.005) and memory ( P = 0.01) abilities. Conclusions Given hyposmia in the general population predicts cognitive decline, the role of cognition in predicting conversion in prodromal PD needs to be assessed in large cohorts followed long‐term. The dopamine system may be associated with changes in processing speed/attention in individuals at risk for PD. © 2017 International Parkinson and Movement Disorder Society