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Folie à deux (French for 'madness of two'), [1] also called shared psychosis [3] or shared delusional disorder (SDD), is a rare psychiatric syndrome in which symptoms of a delusional belief [4] are "transmitted" from one individual to another.
291.1 Alcohol-induced persisting amnestic disorder; 291.x Alcohol-induced psychotic disorder.5 With delusions.3 With hallucinations; 291.89 Alcohol-induced mood disorder (coded 291.8 in the DSM-IV) 291.89 Alcohol-induced anxiety disorder (coded 291.8 in the DSM-IV) 291.89 Alcohol-induced sexual dysfunction (coded 291.8 in the DSM-IV)
Cannabis-induced psychotic disorder: 292.11: Cannabis-induced psychotic disorder, with delusions: 292.12: Cannabis-induced psychotic disorder, with hallucinations: 292.9: Cannabis-related disorder NOS: 293.89: Catatonic disorder due to ... [indicate the general medical condition] V71.02: Child or adolescent antisocial behavior: 299.10 ...
There is considerable evidence that disorders such as the Capgras or Fregoli syndromes are associated with disorders of face perception and recognition. However, it has been suggested that all misidentification problems exist on a continuum of anomalies of familiarity, [13] from déjà vu at one end to the formation of delusional beliefs at the ...
Brief psychotic disorder—according to the classifications of mental disorders DSM-IV-TR and DSM-5—is a psychotic condition involving the sudden onset of at least one psychotic symptom (such as disorganized thought/speech, delusions, hallucinations, or grossly disorganized or catatonic behavior) lasting 1 day to 1 month, often accompanied by emotional turmoil.
This condition is often seen in disorders like schizophrenia, schizoaffective disorder, delusional disorder, manic episodes of bipolar disorder, psychotic depression, and some personality disorders. [2] [3] Alongside delusional jealousy, persecutory delusion is the most common type of delusion in males and is a frequent symptom of psychosis.
The prevalence of this condition stands at about 24 to 30 cases per 100,000 people while 0.7 to 3.0 new cases per 100,000 people are reported every year. Delusional disorder accounts for 1–2% of admissions to inpatient mental health facilities. [7] [30] The incidence of first admissions for delusional disorder is lower, from 0.001 to 0.003%. [31]
This disorder was first defined in 1978 by Greek psychiatrist George N. Christodoulou, M.D., Ph.D., FRCPsych. Although the symptoms of subjective doubles have been described before 1978, [5] the disorder was not given a name until Christodoulou called it the syndrome of subjective doubles in the American Journal of Psychiatry.