title: Psychosis in Parkinson's disease: phenomenology, frequency, risk factors, and current understanding of pathophysiologic mechanisms.
abstract: Psychosis in Parkinson's disease refers to a combination of hallucinations and delusions occurring with a clear sensorium and a chronic course. Hallucinations may involve several sensory modalities. Complex visual hallucinations are the most common type. "Minor" hallucinatory phenomena are frequently present and include visual illusions, passage hallucinations, and sense of presence. Insight may be lost in patients with cognitive impairment. Delusions of a paranoid type are more rare than hallucinations. Both hallucinations and delusions are more frequent in Parkinson's disease patients with dementia. Pathogenesis involves complex and probably multifactorial mechanisms, including pharmacologic (dopaminergic treatment and others) and disease-related factors.
authors.affiliation: Department of Neurology, Henri-Mondor Hospital, Créteil, France. gilles.fenelon@hmn.aphp.fr
authors.forename: Gilles
authors.initials: G
authors.lastname: Fénelon
mesh_terms: D000978:Antiparkinson Agents / Q000009:adverse effects / Q000627:therapeutic use; D001921:Brain / Q000503:physiopathology; D015897:Comorbidity; D003430:Cross-Sectional Studies; D003704:Dementia / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology; D006212:Hallucinations / Q000139:chemically induced; D006801:Humans; D018377:Neurotransmitter Agents / Q000502:physiology; D010300:Parkinson Disease / Q000175:diagnosis* / Q000453:epidemiology / Q000503:physiopathology; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000175:diagnosis* / Q000453:epidemiology / Q000503:physiopathology; D012307:Risk Factors
chemical_list: D000978:Antiparkinson Agents; D018377:Neurotransmitter Agents