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The Pill Questionnaire may severely underestimate impairments in activities of daily living (ADL) in patients with Parkinson's disease (PD).
Many patients with PD stay cognitively intact, especially if one discounts very mild executive dysfunctions in neuropsychological tests. Notwithstanding the above, it is recognised that increasing disability due to cognitive deficits, that is, dementia, develops in a substantial number of PD patients.1 Affected cognitive domains are variable, often dominated by impairments in executive functions, but may also include impaired visuospatial, constructional attention and memory functions. Point prevalence of dementia associated with PD (PD-D) is roughly 30%, but that number will largely depend on …
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.