Abstract
With an estimated prevalence of about 24%, dementia is common in Parkinson’s disease (PD) [Aarsland D, Zaccai J, Brayne C. Mov Disord 20(10):1255–1263, 2005]. Postmortem studies have not found distinct associations between PD, PD with dementia, dementia with Lewy bodies, and Alzheimer’s disease (AD). The varying syndromes may represent a spectrum in which individuals exhibit differences in the type, sequence, or time-course of degeneration of dopaminergic and other neurochemical pathways. Dementia in PD is clinically associated most frequently with older age and more severe motor symptoms, which may have a combined effect.
Environmental and genetic risk factors have been proposed, but they have yet to be demonstrated consistently. Early features of dementia in PD are executive dysfunction, impaired verbal fluency, and visuospatial disturbances, making it clinically distinct from AD. Memory impairment can occur early or late, and diagnostic criteria that require memory impairment may lead to delayed diagnosis. Depression, medication-induced psychosis, and apathy are more common in cognitively impaired individuals and may herald dementia. Dementia in PD is an independent risk factor for morbidity and mortality, and treatment should begin with the reduction or elimination of anticholinergic medications and amantadine, followed by the reduction of dopaminergic medications. Cholinesterase inhibitors may help to preserve function in mild to moderate Parkinson’s disease dementia (PDD). Effects of deep-brain stimulation (DBS) on cognitive decline appear to be modest in carefully selected patients.
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Kavanagh, P., Marder, K. (2013). Dementia. In: Pfeiffer, R.F., Bodis-Wollner, I. (eds) Parkinson’s Disease and Nonmotor Dysfunction. Current Clinical Neurology. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60761-429-6_4
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