title: Are antidepressants less effective in the acute treatment of bipolar I compared to unipolar depression?
abstract: BACKGROUND
  Using our routine documentation system we evaluated the hypothesis that antidepressants may be less effective in the acute treatment of bipolar I depressed patients compared to unipolar depressed patients.
  
  
  METHODS
  Based on the data from 2032 consecutively admitted inpatients with unipolar or bipolar I depression we compared the efficacy of antidepressants in both groups. The outcome was assessed by the Global assessment scale (GAS), the duration of hospitalisation and the Apathic-, Depressive- and Manic Syndrome subscales of the Association for Methodology and Documentation in Psychiatry system.
  
  
  RESULTS
  Cohorts were comparable in treatment regimens and severity of depression at admission. At discharge, there were no statistically significant differences between bipolar I and unipolar depression for the outcome criteria Depressive Syndrome scale, GAS score and days in hospital. Bipolar patients showed a slightly decreased score of the Apathic Syndrome scale at discharge, also reflected by a slightly elevated score of the Manic Syndrome scale.
  
  
  CONCLUSIONS
  This study did not check for differences in side effects such as switching or cycling commonly attributed to the use of tricyclic antidepressants in bipolar patients. Naturalistic data were obtained prospectively, analysis, however, was done retrospectively, thus limiting, but not completely excluding a possible selection bias.
  
  
  CONCLUSIONS
  Evaluating different outcome criteria, our naturalistic data of a large cohort seem to reject the hypothesis that antidepressants may be less effective in the acute treatment of bipolar I compared to unipolar depressed patients.
authors.affiliation: Department of Psychiatry of the Ludwig Maximilians-University, Nussbaumstrasse 7, 80336 Munich, Germany. ilka.lachmair@psy.med.uni-muenchen.de
authors.forename: H J
authors.initials: HJ
authors.lastname: Möller
authors.forename: R
authors.initials: R
authors.lastname: Bottlender
authors.forename: H
authors.initials: H
authors.lastname: Grunze
authors.forename: A
authors.initials: A
authors.lastname: Strauss
authors.forename: J
authors.initials: J
authors.lastname: Wittmann
mesh_terms: D000328:Adult; D000368:Aged; D000928:Antidepressive Agents / Q000494:pharmacology* / Q000627:therapeutic use; D001714:Bipolar Disorder / Q000188:drug therapy*; D015331:Cohort Studies; D003866:Depressive Disorder / Q000188:drug therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012720:Severity of Illness Index; D016896:Treatment Outcome
chemical_list: D000928:Antidepressive Agents