The British Journal of Psychiatry (2009) 194: 73-79. doi: 10.1192/bjp.bp.107.048322
© 2009 The Royal College of Psychiatrists
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Repetition of acute poisoning in Oslo: 1-year prospective study

Fridtjof Heyerdahl, MD

Department of Acute Medicine, Ullevaal University Hospital

Mari Asphjell Bjornaas, MD

Department of Acute Medicine, Ullevaal University Hospital, and Department of Behavioural Sciences in Medicine, Institute of Basic Medical Sciences. Faculty of Medicine, University of Oslo

Rune Dahl, MS

Department of Behavioural Sciences in Medicine, Institute of Basic Medical Sciences. Faculty of Medicine, University of Oslo

Knut Erik Hovda

Department of Acute Medicine, Ullevaal University Hospital

Anne Kathrine Nore, MD

Oslo Emergency Ward

Oivind Ekeberg, MD, PhD

Department of Acute Medicine, Ullevaal University Hospital, and Department of Behavioural Sciences in Medicine, Institute of Basic Medical Sciences. Faculty of Medicine, University of Oslo

Dag Jacobsen, MD, PhD

Department of Acute Medicine, Ullevaal University Hospital, Oslo, Norway

Correspondence: Fridtjof Heyerdahl, Department of Acute Medicine, Ullevaal University Hospital, 0407 Oslo, Norway. Email: fridtjof.heyerdahl{at}medisin.uio.no

Declaration of interest

None. Funding detailed in Acknowledgements.

Background

The repetition of acute poisoning occurs frequently. The intention may change between episodes and many poisonings are treated outside the hospital setting. Few studies have taken this into account.

Aims

To quantify the repetition frequency regardless of the level of health care or the intention behind the poisoning, and to identify possible risk factors for repetition.

Method

A prospective multicentre study of all acute poisonings in Oslo treated in hospital, at an out-patient clinic or by the ambulance service. Repetition was estimated using Kaplan–Meier calculations, and predictive factors were identified using Cox regression analysis.

Results

The estimated 1-year repetition rate was 30% (95% CI 24–35). Independent predictors of repetition were middle age (30–49 years), poisoning with opiates or sedatives, unemployment or living on social welfare, a previous suicide attempt, and a history of psychiatric treatment. Intention was not a significant predictor.

Conclusions

Repetition of acute poisoning is high, irrespective of the level of healthcare and the intention behind the poisoning.


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