title: Concordance of acute and transient psychoses and cycloid psychoses.
abstract: OBJECTIVE
  We prospectively investigated a sample of 42 patients with acute and transient psychotic disorder (ATPD) as defined by the 10th revision of the International Classification of Diseases (ICD-10; F23) to determine the clinical and demographic features of this entity and its relationship to cycloid psychoses.
  
  
  METHODS
  During a 5-year period, all in-patients with ATPD were identified. We systematically evaluated demographic and clinical features and carried out follow-up investigations on average 2 years after the index episode, using standardised instruments.
  
  
  RESULTS
  We found 42 cases of ATPD (4.1%) among 1,036 patients treated for psychotic disorders or a major affective episode. There was a marked female preponderance in ATPD (79%). Fifty-five percent of cases concurrently met the criteria of cycloid psychosis according to Perris and Brockington [in Perris C, Struwe G, Jansson B (eds): Biological Psychiatry. Amsterdam, Elsevier, 1981, pp 447-450]. There was no difference in gender distribution between cycloid and non-cycloid ATPD. As expected, abrupt onset and polymorphic features were significantly more common in cycloid than in non- cycloid ATPD. At follow-up, patients with cycloid ATPD showed less persistent alterations and better social functioning.
  
  
  CONCLUSIONS
  ATPD as defined by ICD-10 is a heterogeneous category. A diagnosis of cycloid psychosis is made in half of the cases of ATPD, and in these cases, the prognosis is more favourable.
authors.affiliation: Department of Psychiatry and Psychotherapy, Martin Luther University Halle-Wittenberg, Halle, Germany. frank.pillmann@medizin.uni-halle.de
authors.forename: F
authors.initials: F
authors.lastname: Pillmann
authors.forename: A
authors.initials: A
authors.lastname: Haring
authors.forename: S
authors.initials: S
authors.lastname: Balzuweit
authors.forename: R
authors.initials: R
authors.lastname: Blöink
authors.forename: A
authors.initials: A
authors.lastname: Marneros
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D003527:Cyclothymic Disorder / Q000145:classification / Q000175:diagnosis* / Q000523:psychology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000145:classification / Q000175:diagnosis* / Q000523:psychology