Predictive factors for dementia in Parkinson's disease

Cognitive performance and Parkinson disease: neuropsychological and CT study

30 patients with Parkinson disease were investigated with computed tomographic (CT) scanning and neuropsychological tests. The CT data proved to be of scant interest whereas tests of intelligence, verbal and visual memory and visuomotor abilities were all informative. Parkinsonian patients with cognitive impairment seem to constitute a separate group in which akinesia and gait disturbances predominate.

Dementia in idiopathic Parkinson's disease. Variables associated with its occurrence in 203 patients

A series of 203 patients with primary Parkinson's disease treated with L-DOPA, with adequate neurological documentation of mental status at serial intervals during their illness, constitutes the study population. Based on the results of the latest neurological examination, slightly less than one-third (29%) had mental impairment assessed as neurologically significant. Of the eleven clinical variables analysed (Cox regression analysis) for potential influence on the occurrence of an organic mental syndrome, four had a statistically significant effect: (1) the stage of disease at initial neurological examination; (2) the occurrence of acute confusional states; (3) the years of Parkinson's prior to L-DOPA; and (4) the total duration of L-DOPA therapy. The pathogenesis of dementia in this subgroup of Parkinson's disease is discussed.