title: Psychiatric intervention and repeated admission to emergency centres due to drug overdose.
abstract: BACKGROUND
  Repeated drug overdose is a major risk factor for suicide. Data are lacking on the effect of psychiatric intervention on preventing repeated drug overdose.
  
  
  OBJECTIVE
  To investigate whether psychiatric intervention was associated with reduced readmission to emergency centres due to drug overdose.
  
  
  METHODS
  Using a Japanese national in-patient database, we identified patients who were first admitted to emergency centres for drug overdose in 2010-2012. We used propensity score matching for patient and hospital factors to compare readmission rates between intervention (patients undergoing psychosocial assessment) and unexposed groups.
  
  
  RESULTS
  Of 29 564 eligible patients, 13 035 underwent psychiatric intervention. In the propensity-matched 7938 pairs, 1304 patients were readmitted because of drug overdose. Readmission rate was lower in the intervention than in the unexposed group (7.3%v. 9.1% respectively,P<0.001).
  
  
  CONCLUSIONS
  Psychiatric intervention was associated with reduced readmission in patients who had taken a drug overdose.
  
  
  BACKGROUND
  None.
  © The Royal College of Psychiatrists 2015. This is an open access article distributed under the terms of the Creative Commons Non-Commercial, No Derivatives (CC BY-NC-ND) licence.
authors.affiliation: , MPH, Department of Youth Mental Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
authors.forename: Akiko
authors.initials: A
authors.lastname: Kanehara
authors.affiliation: , MD, MPH, , MD, PhD, and , MPH, Department of Clinical Epidemiology and Health Economics, School of Public Health, The University of Tokyo, Tokyo, Japan.
authors.forename: Hayato
authors.initials: H
authors.lastname: Yamana
authors.affiliation: , MD, MPH, , MD, PhD, and , MPH, Department of Clinical Epidemiology and Health Economics, School of Public Health, The University of Tokyo, Tokyo, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Yasunaga
authors.affiliation: , MD, MPH, , MD, PhD, and , MPH, Department of Clinical Epidemiology and Health Economics, School of Public Health, The University of Tokyo, Tokyo, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Matsui
authors.affiliation: , MD, MScPH, Department of Psychiatry and Behavioral Sciences, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan.
authors.forename: Shuntaro
authors.initials: S
authors.lastname: Ando
authors.affiliation: , MD, PhD, , MD, Department of Neuropsychiatry, The University of Tokyo Hospital, Tokyo, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Okamura
authors.affiliation: , MD, PhD, , MD, Department of Neuropsychiatry, The University of Tokyo Hospital, Tokyo, Japan.
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Kumakura
authors.affiliation: , MD, PhD, Department of Health Policy and Informatics, Tokyo Medical and Dental University Graduate School of Medicine, Tokyo, Japan.
authors.forename: Kiyohide
authors.initials: K
authors.lastname: Fushimi
authors.affiliation: , MD, PhD, Department of Neuropsychiatry, The University of Tokyo Hospital, Tokyo, Japan.
authors.forename: Kiyoto
authors.initials: K
authors.lastname: Kasai