Naturalistic follow-up of co-morbid substance use in schizophrenia: The West London first-episode study

Harrison, I, Joyce, E M, Mutsatsa, S H, Hutton, S B, Huddy, V, Kapasi, M and Barnes, T R E (2008) Naturalistic follow-up of co-morbid substance use in schizophrenia: The West London first-episode study. Psychological Medicine, 38 (1). pp. 79-88. ISSN 0033-2917

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Abstract

Background. The impact of co-morbid substance use in first-episode schizophrenia has not been fully explored. Method. This naturalistic follow-up of a cohort of 152 people with first-episode schizophrenia examined substance use and clinical outcome in terms of symptoms and social and neuropsychological function. Results. Data were collected on 85 (56%) of the patient cohort after a median period of 14 months. Over the follow-up period, the proportion of smokers rose from 60% at baseline to 64%. While 30% reported lifetime problem drinking of alcohol at baseline, only 15% had problem drinking at follow-up. Furthermore, while at baseline 63% reported lifetime cannabis use and 32% were currently using the drug, by the follow-up assessment the latter figure had fallen to 18.5%. At follow-up, persistent substance users had significantly more severe positive and depressive symptoms and greater overall severity of illness. A report of no lifetime substance use at baseline was associated with greater improvement in spatial working memory (SWM) at follow-up. Conclusions. Past substance use may impede recovery of SWM performance in people with schizophrenia in the year or so following first presentation to psychiatric services. The prevalence of substance use other than tobacco tends to diminish over this period, in the absence of specific interventions. Persistent substance use in first-episode schizophrenia is associated with more severe positive and depressive symptoms but not negative symptoms, and should be a target for specific treatment intervention. © 2007 Cambridge University Press.

Item Type: Article
Schools and Departments: School of Psychology > Psychology
Depositing User: Samuel Hutton
Date Deposited: 06 Feb 2012 15:48
Last Modified: 16 Mar 2012 09:46
URI: http://srodev.sussex.ac.uk/id/eprint/14462
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