Bipolar Disorders: Mixed States, Rapid-Cycling, and Atypical Forms

211 Acute and transient psychotic disorderHowever, the distinction of the acute polymorphic psychotic disorders in agroup ‘‘with symptoms’’ and another one ‘‘without symptoms of schizophrenia’’ isabsolutely useless. No defining or prognostic validity has been found (Marnerosand Pillmann, 2004).Another crucial point is that subgroups of acute polymorphic psychotic disorderhave the strongest relationship to the most essential predecessors of theconcept of ATPDs namely the cycloid psychoses and bouffée délirante (Pillmannet al., 2001; Pillmann and Marneros, 2003; Marneros and Pillmann, 2004).The Diagnostic and Statistical Manual of Mental Disorders, 4th edn (DSM-IV:American Psychiatic Association, 1994) has a similar category to ICD-10, the‘‘brief psychotic disorder’’ (298.8) (Table 9.5).By definition, patients fulfilling the DSM-IV BP criteria also fulfill the ICD-10criteria for ATPD, but not those of other ICD-10 psychotic groups. In otherwords, all DSM-IV brief psychosis patients are also ICD-10 ATPD, but theconverse is not true. ‘‘Brief psychosis’’ of DSM-IV does not differ from otherATPDs as defined by ICD-10 in all essential parameters. There is no necessity toconside r them as a separate diagnosis (Pillmann et al., 20 02a, b ; Marneros andPillmann, 2004).The predecessors of the acute and transient psychotic disordersWhen looking at the synonyms given by the WHO for ATPDs (Table 9.6), wecannot help but recognize their predecessors. However, the most essential predecessorsare cycloid psychosis and boufféedélirante, which show relevant similaritiesto the subgroup of ATPD ‘‘acute polymorphic psychotic disorders.’’Table 9.6 Synonyms for acute and transientpsychotic disorder* Acute (undifferentiated) schizophrenia* Bouffée délirante* Cycloid psychosis* Oneirophrenia* Paranoid reaction* Psychogenic (paranoid) psychosis* Reactive psychosis* Schizophrenic reaction* Schizophreniform attack or psychosis* Remitting schizophrenia* Good-prognosis schizophrenia