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From the Department of Neurological Sciences (Drs. Goetz and Stebbins), Rush University/Rush Presbyterian St. Luke's Medical Center, Chicago, IL; the private practice of Dr. Vogel, Indianapolis, IN; and the Parkinson's Institute (Dr. Tanner), Sunnyvale, CA.
Address correspondence and reprint requests to Dr. Christopher Goetz, Department of Neurological Sciences, Rush University/Rush Presbyterian St. Luke's Medical Center, Chicago, IL 60612.
Objective: To characterized patients who develop hallucinations early in the course of dopaminergic therapy for Parkinson's disease (PD) and contrast them with patients developing hallucinations after chronic drug treatment.
Methods: Parkinsonian patients who met diagnostic criteria for PD, experienced hallucinations, had a detailed hallucination interview at the onset time of their first hallucination, and had a 5-year clinical follow-up or an autopsy in those 5 years were identified and divided into two groups for comparison: 12 patients who developed early hallucinations within 3 months of starting levodopa therapy and 58 PD patients who developed hallucinations after 1 year of dopaminergic therapy. We contrasted the quality, content, diurnal nature, and emotional elements of the hallucinations, as well as the 5-year follow-up data on diagnosis, disease course, community home or nursing home outcome, and mortality.
Results: Both groups experienced a predominance of visual hallucinations, visions of people and animals, and vivid colors and definition. Features distinctive to the early onset hallucinating patients included visions that persisted in daytime as well as nighttime, frightening content with paranoia, and accompanying nonvisual hallucinations, either auditory, olfactory, tactile, or combinations thereof. At the 5-year follow-up, none of the early onset hallucinators had PD as their sole disorder. Four of the 12 had an underlying psychiatric illness that included hallucinations or psychosis preceding their parkinsonism by several years. In the other eight patients at the 5-year follow-up, their parkinsonism evolved to include additional signs that were no longer consistent with PD. The primary diagnoses were diffuse Lewy body disease and Alzheimer's disease (AD) with extrapyramidal signs. Patients with early drug-induced hallucinations had significantly greater placement to nursing homes and greater mortality.
Conclusions: Early onset drug-related hallucinations are not typical of PD. Their presence should signal an investigation of two alternative diagnoses, either a comorbid psychotic illness (often unrevealed by the patient initially) or an evolving parkinsonism-plus syndrome.
Presented in part at the annual meeting of the American Neurological Association; San Diego, CA; September 1997.
Received April 1, 1998. Accepted in final form May 16, 1998.
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