title: Organic delusional disorder in psychiatric in-patients: comparison with delusional disorder.
abstract: Organic delusional disorder (ODD) is rarely diagnosed in psychiatric in-patients, and may be misdiagnosed as delusional disorder (DD) from a similar clinical presentation. The aim of the present study was to investigate the characteristics of ODD and to make a comparison with those of DD patients. Patients who conformed to DSM-III-R criteria for ODD were recruited from an 8-year psychiatric in-patient database. Matching controls were DD patients admitted over the same time period. The prevalence of ODD according to DSM-III-R criteria was 0.4% of total admissions and 2.9% of organic mental disorders. Compared to DD patients, ODD patients less often had a family psychiatric history, and had an older age of onset of psychiatric disorder, longer hospital stays and lower treatment dosage of antipsychotic drugs. It is suggested that a detailed medical history and examination are needed in patients with delusion, especially in patients with a late onset of psychiatric symptoms and no family psychiatric history.
authors.affiliation: Department of Psychiatry, Veterans General Hospital-Taipei, Taiwan, Republic of China.
authors.forename: Y
authors.initials: Y
authors.lastname: Lo
authors.forename: S J
authors.initials: SJ
authors.lastname: Tsai
authors.forename: C H
authors.initials: CH
authors.lastname: Chang
authors.forename: J P
authors.initials: JP
authors.lastname: Hwang
authors.forename: C B
authors.initials: CB
authors.lastname: Sim
mesh_terms: D000328:Adult; D000368:Aged; D014150:Antipsychotic Agents / Q000008:administration & dosage; D003702:Delusions / Q000175:diagnosis* / Q000188:drug therapy / Q000235:genetics / Q000523:psychology; D003937:Diagnosis, Differential; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D019965:Neurocognitive Disorders / Q000175:diagnosis* / Q000188:drug therapy / Q000235:genetics / Q000523:psychology; D010343:Patient Admission; D011569:Psychiatric Status Rating Scales; D012307:Risk Factors
chemical_list: D014150:Antipsychotic Agents