Olfactory dysfunction is associated with neuropsychiatric manifestations in Parkinson's disease
Identifieur interne : 000219 ( Main/Exploration ); précédent : 000218; suivant : 000220Olfactory dysfunction is associated with neuropsychiatric manifestations in Parkinson's disease
Auteurs : James F. Morley [États-Unis] ; Daniel Weintraub [États-Unis] ; Eugenia Mamikonyan [États-Unis] ; Paul J. Moberg [États-Unis] ; Andrew D. Siderowf [États-Unis] ; John E. Duda [États-Unis]Source :
- Movement Disorders [ 0885-3185 ] ; 2011-09.
English descriptors
Abstract
Hyposmia, psychiatric disorders, and cognitive problems are common nonmotor manifestations in Parkinson's disease, but how they are related remains unclear. We investigated the relationship between olfactory dysfunction and neuropsychiatric manifestations and performed a cross‐sectional study of 248 patients at two movement disorders clinics at academic medical centers. Psychiatric measures were the Geriatric Depression Scale‐15, Inventory of Depressive Symptomatology, State Anxiety Inventory, Apathy Scale, and Parkinson's Psychosis Rating Scale. Cognitive measures were the Mini–Mental State Examination, Hopkins Verbal Learning Test–Revised, Digit Span, Tower of London‐Drexel, and the Stroop Color Word Test. Olfaction was tested with the University of Pennsylvania Smell Identification Test. There was no significant association between olfaction and mood measures, but psychotic symptoms were more common in patients with olfaction scores below the median (30% vs. 12%; P < 0.001). Worse olfaction was associated with poorer memory (Hopkins Verbal Learning Test–Revised delayed recall items: mean [standard deviation], 6.2 [3.2] vs. 8.4 [2.8]; P < 0.001) and executive performance (Tower of London total moves, 52 [38] vs. 34 [21]; P < 0.001). Odor‐identification score was a significant predictor of abnormal performance on these cognitive tests after adjustment for age, sex, and disease characteristics in logistic regression models. The relationship between hyposmia, psychosis, and specific cognitive impairments may reflect the anatomic distribution of Lewy pathology and suggests that olfactory dysfunction could be a biomarker of additional extranigral disease. Future prospective studies are warranted to assess whether hyposmia, a very early feature of Parkinson's disease, might be used to predict the appearance of other common nonmotor symptoms. © 2011 Movement Disorder Society
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DOI: 10.1002/mds.23792
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