title: Number of prior episodes and the presence of depressive symptoms are associated with longer length of stay for patients with acute manic episodes.
abstract: BACKGROUND
  Few studies have analyzed predictors of length of stay (LOS) in patients admitted due to acute bipolar manic episodes. The purpose of the present study was to estimate LOS and to determine the potential sociodemographic and clinical risk factors associated with a longer hospitalization. Such information could be useful to identify those patients at high risk for long LOS and to allocate them to special treatments, with the aim of optimizing their hospital management.
  
  
  METHODS
  This was a cross-sectional study recruiting adult patients with a diagnosis of bipolar disorder (Diagnostic and Statistical Manual of Mental Disorders, 4th edition, text revision (DSM-IV-TR) criteria) who had been hospitalized due to an acute manic episode with a Young Mania Rating Scale total score greater than 20. Bivariate correlational and multiple linear regression analyses were performed to identify independent predictors of LOS.
  
  
  RESULTS
  A total of 235 patients from 44 centers were included in the study. The only factors that were significantly associated to LOS in the regression model were the number of previous episodes and the Montgomery-Åsberg Depression Rating Scale (MADRS) total score at admission (P < 0.05).
  
  
  CONCLUSIONS
  Patients with a high number of previous episodes and those with depressive symptoms during mania are more likely to stay longer in hospital. Patients with severe depressive symptoms may have a more severe or treatment-resistant course of the acute bipolar manic episode.
authors.affiliation: AstraZeneca Medical Department, Madrid, Spain. jorgealejandro.maurino@astrazeneca.com.
authors.forename: Manuel
authors.initials: M
authors.lastname: Martin-Carrasco
authors.forename: Ana
authors.initials: A
authors.lastname: Gonzalez-Pinto
authors.forename: Jaime L
authors.initials: JL
authors.lastname: Galan
authors.forename: Javier
authors.initials: J
authors.lastname: Ballesteros
authors.forename: Jorge
authors.initials: J
authors.lastname: Maurino
authors.forename: Eduard
authors.initials: E
authors.lastname: Vieta