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Profiles of visuospatial memory dysfunction in opioid exposed and dependent populations

Research output: Contribution to journalArticle

Author(s)

A. Baldacchino, S. Tolomeo, David Balfour, Keith Matthews

School/Research organisations

Abstract

Background. Chronic opioid exposure is common world-wide, but behavioural performance remains under-investigated. This study aimed to investigate visuospatial memory performance in opioid-exposed and dependent clinical populations and its associations with measures of intelligence and cognitive impulsivity.
Methods. We recruited 109 participants: (i) patients with a history of opioid dependence due to chronic heroin use (n = 24), (ii) heroin users stabilised on methadone maintenance treatment (n = 29), (iii) participants with a history of chronic pain and prescribed tramadol and codeine (n = 28) and (iv) healthy controls (n = 28). The neuropsychological tasks from the Cambridge Neuropsychological Test Automated Battery included the Delayed Matching to Sample (DMS), Pattern Recognition Memory, Spatial Recognition Memory, Paired Associate Learning, Spatial Span Task, Spatial Working Memory and Cambridge Gambling Task. Pre-morbid general intelligence was assessed using the National Adult Reading Test.
Results. As hypothesised, this study identified the differential effects of chronic heroin and methadone exposures on neuropsychological measures of visuospatial memory (p < 0.01) that were independent of injecting behaviour and dependence status. The study also identified an improvement in DMS performance (specifically at longer delays) when the methadone group was compared with the heroin group and also when the heroin group was stabilised onto methadone. Results identified differential effects of chronic heroin and methadone exposures on various neuropsychological measures of visuospatial memory independently from addiction severity measures, such as injecting behaviour and dependence status.
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Details

Original languageEnglish
Pages (from-to)1174-1184
Number of pages27
JournalPsychological Medicine
Volume49
Issue number7
Early online date20 Nov 2018
DOIs
Publication statusPublished - May 2019

    Research areas

  • Codeine, Cognition, Heroin, Methadone, Opiods, Tramadol, Visuospatial memory

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