Prevalence and Clinical Correlates of Psychotic Symptoms in Parkinson Disease

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Abstract
IN PATIENTS with Parkinson disease (PD), neuropsychiatric symptoms frequently accompany motor manifestations of the disease. Psychotic symptoms, ie, disturbances of perception and thought, are among the most frequent and troublesome of these behavioral disturbances. Hallucinations, usually of visual modality, occur in about 30% of patients with PD, and delusions have been found in 10%.1 In a recent study,2 visual hallucinations were reported in 26% of patients with PD. The exact frequency of such symptoms has not been established because most previous studies included only small and selected samples of patients and used different definitions of PD and psychiatric disorders.