• Estimates of the prevalence of dementia in patients with Parkinson's disease (PD) vary
considerably. Dementia in PD has been linked to a visuospatial disturbance, impairment of …

• Objective.—To compare cognitive changes in the dementias of Parkinson's disease (PD)
and Alzheimer's disease (AD). Design.—Case series, group comparisons. Setting …

It is now recognized that many patients with Parkinson's disease will experience cognitive
and intellectual decline in the course of their illness. Selective visuospatial and memory …

Background The nature of cognitive performance in subjects with Parkinson disease (PD)
without dementia is controversial, perhaps because of failure to exclude subjects with …

We followed up, after 31/2 years, a whole population cohort of 249 patients with Parkinson's
disease (PD) 1st examined in 1983 to 1984. Of the survivors, 23.6% qualified for a DSM III-R …

• The question of whether dementia of the Alzheimer type and dementia associated with
Parkinson's disease are clinically separable is controversial. We examined possible …

In 520 patients with parkinsonism seen over eight years, 168 (32%) had moderate to marked
dementia. Although the demented patients were older than the nondemented patients (70.4 …

Objectives: To estimate the frequency and determine the risk factors for incident dementia in
community-dwelling patients with Parkinson's disease (PD) and in control subjects. Design …

Objective: To compare the incidence of dementia in PD with that of a control group without
PD, and to assess the relationship between dementia and other features of PD. Methods …

We performed a longitudinal study (mean follow-up 86.7 months) to evaluate motor and
mental deterioration in patients with Parkinson's disease. Of the original 91 patients, only 61 …