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Dual diagnosis in the suburbs: prevalence, need, and in-patient service use.

AbstractBACKGROUND:
Previous research has found comorbid severe mental illness and substance misuse (dual diagnosis) to be highly prevalent and to be associated with serious clinical and social problems, and increased service use in inner-city populations. The present study measures the prevalence of dual diagnosis, patterns of substance misuse, and associated in-patient use in a more demographically representative population in a suburban area of South London.
METHOD:
We identified representative prevalent cases with psychotic illnesses who had been in contact with services in a geographically defined catchment area in Croydon over the previous 6 months. Cases of alcohol or substance misuse and dependence were identified through standardised interviews with patients and keyworkers, and sociodemographic and in-patient psychiatric service use data were also recorded.
RESULTS:
Sixty-one of the 124 cases identified were randomly selected for interview, of whom 66% responded (N = 40). The prevalence rates of dual diagnosis (DD) observed were 33% (95% CI 18-47%) for any substance misuse, 20% (95% CI 8-32%) for alcohol misuse only, 5% (95% CI-16 to 26%) for drug misuse only, and 8% (95% CI -0.7 to 16%) for both drug and alcohol misuse. A lifetime history of any illicit drug use was observed in 35% of the sample (95% CI 20-50%). Patients who misuse alcohol and drugs were not found to be more likely to have been admitted to hospital in the previous 2 years, with little difference being observed between DD and psychosis-only patients in the mean number of in-patient admissions in this period (mean difference 0.25, 95% CI for difference -1.5 to 2.0). However, the DD patients were found to have spent on average over twice as long in hospital as other psychotic in-patients over the previous 2 years (mean difference 67.3 days, 95% CI for difference -205.9 to 71.2 days). DD patients were also found to have a greater number of unmet areas of need than the psychosis-only patients, which included accommodation, daytime activity, and social life, as well as substance misuse.
CONCLUSIONS:
The prevalence of substance misuse in patients with severe mental disorders in a suburban area is about as high as that for similar patients in inner-city London. While DD patients are not admitted more often than patients with psychosis alone, they have double the length of in-patient stay, which may be attributable to higher levels of unmet need.
AuthorsS Wright, K Gournay, E Glorney, G Thornicroft
JournalSocial psychiatry and psychiatric epidemiology (Soc Psychiatry Psychiatr Epidemiol) Vol. 35 Issue 7 Pg. 297-304 (Jul 2000) ISSN: 0933-7954 [Print] Germany
PMID11016524 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Topics
  • Catchment Area, Health
  • Cross-Sectional Studies
  • Diagnosis, Dual (Psychiatry)
  • Hospitalization
  • Humans
  • London (epidemiology)
  • Needs Assessment
  • Prevalence
  • Psychotic Disorders (diagnosis, epidemiology, rehabilitation)
  • Substance-Related Disorders (diagnosis, epidemiology, rehabilitation)
  • Suburban Population

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