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A cross sectional study comparing cognitive function in treatment responsive versus treatment non-responsive schizophrenia: evidence from the STRATA study.

Research output: Contribution to journalArticlepeer-review

Ed Millgate, Jenny Kravariti, Alice Egerton, Oliver Howes, Sir Robin M Murray, Laura Kassoumeri, Jacek Donocik, Shôn W. Lewis, Richard Drake, Stephen Lawrie, Anna Murphy, Tracy Collier, Jane Lees, Charlotte Stockton-Powdrell, James Walters, Bill Deakin, James Maccabe

Original languageEnglish
JournalBMJ Open
Accepted/In press4 Oct 2021
Published25 Nov 2021

Documents

  • STRATA1_Fullversion_BMJOpen

    STRATA1_Fullversion_BMJOpen.pdf, 740 KB, application/pdf

    Uploaded date:03 Jun 2021

    Version:Final published version

    Licence:CC BY

King's Authors

Abstract

Background: 70-84% of individuals with antipsychotic treatment resistance show non-response (NR) from the first episode. Emerging cross-sectional evidence comparing cognitive profiles in treatment resistant schizophrenia to treatment-responsive schizophrenia has indicated that verbal memory and language functions may be more impaired in treatment resistance. We sought to confirm this finding by comparing cognitive performance between antipsychotic non-responders (NR) and responders (R) using a brief cognitive battery for schizophrenia, with a primary focus on verbal tasks compared against other measures of cognition.
Design: Cross-sectional

Setting: This cross-sectional study recruited antipsychotic treatment responders (R) and antipsychotic non-responders (NR) across four UK sites. Cognitive performance was assessed using the Brief Assessment of Cognition in Schizophrenia (BACS).

Participants: One hundred and six participants aged 18 – 65 years with a diagnosis of schizophrenia or schizophreniform disorder were recruited according to their treatment response, with 52 NR, and 54 R cases.

Outcomes: Composite and subscale scores of cognitive performance on the BACS. Group (R vs NR) differences in cognitive scores were investigated using univariable and multivariable linear regressions adjusted for age, gender and illness duration.

Results: Univariable regression models observed no significant differences between R and NR groups on any measure of the BACS, including verbal memory (95% CI -6.63 to 2.66, p = .398) and verbal fluency (95% CI -2.46 to 4.91, p = .510). This pattern of findings was consistent in multivariable models.

Conclusions: The lack of group difference in cognition in our sample is likely due to a lack of clinical distinction between our groups. Future investigations should aim to utilise machine learning methods using longitudinal first episode samples to identify responder subtypes within schizophrenia, and how cognitive factors may interact within this.

Trail registration number: REC: 15/LO/0038.



Keywords: cognition, treatment resistance, antipsychotic response, schizophrenia, BACS

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