title: [Cycloid psychoses as atypical manic-depressive disorders. Results of a family study].
abstract: BACKGROUND
  Whereas a growing body of evidence suggests that cycloid psychoses have to be separated from schizophrenic psychoses, their relations to bipolar affective disorder are less clear.
  
  
  METHODS
  In a controlled family study, we recruited 46 patients with cycloid psychosis (CP), 33 with manic-depressive illness (MDI), and 27 controls. Three hundred fifty-six of 389 living first-degree relatives were personally examined by experienced psychiatrists blinded to the diagnosis of the index proband.
  
  
  RESULTS
  The relatives of CP patients showed significantly lower morbidity risk of functional psychoses than relatives of patients with MDI in Kaplan-Meier life table calculation. The morbidity risk for functional psychoses in relatives of patients with CP did not differ significantly from that in relatives of controls.
  
  
  CONCLUSIONS
  These results suggest that CP are etiologically different from bipolar affective psychoses and cannot be integrated into the spectrum of bipolar affective disorders. The findings provide further evidence for a nosological independence of CP.
authors.affiliation: Klinik und Poliklinik für Psychiatrie und Psychotherapie, Universität Würzburg, Füchsleinstrasse 15, 97080, Würzburg, Germany. burkhard.jabs@mail.uni-wuerzburg.de
authors.forename: B
authors.initials: B
authors.lastname: Jabs
authors.forename: G
authors.initials: G
authors.lastname: Althaus
authors.forename: A
authors.initials: A
authors.lastname: Bartsch
authors.forename: A
authors.initials: A
authors.lastname: Schmidtke
authors.forename: G
authors.initials: G
authors.lastname: Stöber
authors.forename: H
authors.initials: H
authors.lastname: Beckmann
authors.forename: B
authors.initials: B
authors.lastname: Pfuhlmann
mesh_terms: D000328:Adult; D000341:Affective Disorders, Psychotic / Q000175:diagnosis / Q000235:genetics*; D001714:Bipolar Disorder / Q000175:diagnosis / Q000235:genetics*; D003527:Cyclothymic Disorder / Q000175:diagnosis / Q000235:genetics*; D003937:Diagnosis, Differential; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D006801:Humans; D015993:Life Tables; D008297:Male; D010641:Phenotype; D018570:Risk Assessment; D013223:Statistics as Topic