BMJ  2007;335:336 (18 August), doi:10.1136/bmj.39251.599259.55 (published 13 July 2007)

Research

Use of intensive case management to reduce time in hospital in people with severe mental illness: systematic review and meta-regression

¹ University of Oxford, Warneford Hospital, Oxford OX3 7JX, ² Division of Mental Health, St George's, University of London, London SW17 0RE, ³ School of Epidemiology and Health Sciences, University of Manchester, Manchester, ⁴ Division of Psychiatry and Behavioural Sciences, University of Manchester, Preston

Objectives To explain why clinical trials of intensive case management for people with severe mental illness show such inconsistent effects on the use of hospital care.

Design Systematic review with meta-regression techniques applied to data from randomised controlled trials.

Data Sources Cochrane central register of controlled trials, CINAHL, Embase, Medline, and PsychINFO databases from inception to January 2007. Additional anonymised data on patients were obtained for multicentre trials.

Review methods Included trials examined intensive case management compared with standard care or low intensity case management for people with severe mental illness living in the community. We used a fidelity scale to rate adherence to the model of assertive community treatment. Multicentre trials were disaggregated into individual centres with fidelity data specific for each centre. A multivariate meta-regression used mean days per month in hospital as the dependent variable.

Results We identified 1335 abstracts with a total of 5961 participants. Of these, 49 were eligible and 29 provided appropriate data. Trials with high hospital use at baseline (before the trial) or in the control group were more likely to find that intensive case management reduced the use of hospital care (coefficient –0.23, 95% confidence interval –0.36 to –0.09, for hospital use at baseline; –0.44, –0.57 to –0.31, for hospital use in control groups). Case management teams organised according to the model of assertive community treatment were more likely to reduce the use of hospital care (coefficient –0.31, –0.59 to –0.03), but this finding was less robust in sensitivity analyses and was not found for staffing levels recommended for assertive community treatment.

Conclusions Intensive case management works best when participants tend to use a lot of hospital care and less well when they do not. When hospital use is high, intensive case management can reduce it, but it is less successful when hospital use is already low. The benefits of intensive case management might be marginal in settings that have already achieved low rates of bed use, and team organisation is more important than the details of staffing. It might not be necessary to apply the full model of assertive community treatment to achieve reductions in inpatient care.

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