Differences in mental health, substance use, and other problems among dual diagnosis patients attending psychiatric or substance misuse treatment services
Mental Health and Substance Use: dual diagnosis, Volume 1, Issue 1 February 2008 , pages 54 - 63


The study investigates differences in dual diagnosis disorders among patients in psychiatric and in substance use treatment services.

Important clinical differences were found between dual diagnosis patients in psychiatry and substance use treatment services. Dual diagnosis patients in psychiatry services were more likely to have a psychotic illness: those in the inpatient psychiatry service had the most severe mental health problems, and were exposed to the greatest risks to their safety. Psychiatric outpatients were least likely to have an alcohol dependence disorder, although a high rate of drug use disorders (mainly involving cannabis) was found among the psychiatric inpatients. High rates of affective disorders and suicide risk were found among patients in all treatment services.

The term 'dual' diagnosis can be misleading. Dual diagnosis patients present with complex mental health, physical health, psychosocial disability, and safety needs, and the pattern of problems presented by dual diagnosis patients varies across different treatment services.

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