What is the prevalence of dementia in patients with Parkinson disease (PD)?

Updated: Jan 24, 2019
  • Author: Robert A Hauser, MD, MBA; Chief Editor: Selim R Benbadis, MD  more...
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Answer

The prevalence of dementia in Parkinson disease ranges from 20-40%, with the disease conferring a 2- to 6-fold increased risk compared with control populations. [33] Many patients with Parkinson disease have some executive function impairment, even early in the disease. [33]


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