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Cognitive Impairment in Bipolar Disorder and Schizophrenia: A Systematic Review

Aims: Previous comparisons of cognitive decline among patients with bipolar disorder (BD) and schizophrenia (SZ) have found somehow quite similar profiles of deficits, but results have varied between studies. Therefore an extensive and thoughtful systematic review of the matter is warranted. Methods...

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Autores principales: Vöhringer, Paul A., Barroilhet, Sergio A., Amerio, Andrea, Reale, Maria Laura, Alvear, Katherine, Vergne, Derick, Ghaemi, S. Nassir
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3737461/
https://www.ncbi.nlm.nih.gov/pubmed/23964248
http://dx.doi.org/10.3389/fpsyt.2013.00087
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author Vöhringer, Paul A.
Barroilhet, Sergio A.
Amerio, Andrea
Reale, Maria Laura
Alvear, Katherine
Vergne, Derick
Ghaemi, S. Nassir
author_facet Vöhringer, Paul A.
Barroilhet, Sergio A.
Amerio, Andrea
Reale, Maria Laura
Alvear, Katherine
Vergne, Derick
Ghaemi, S. Nassir
author_sort Vöhringer, Paul A.
collection PubMed
description Aims: Previous comparisons of cognitive decline among patients with bipolar disorder (BD) and schizophrenia (SZ) have found somehow quite similar profiles of deficits, but results have varied between studies. Therefore an extensive and thoughtful systematic review of the matter is warranted. Methods: Studies were found through systematic search (PubMed) following PRISMA guidelines. To be included, studies must have assessed the following cognitive functions: executive functions, memory, IQ, attention-concentration, and perceptuomotor function. In order to make comparison between the two entities, studies should include BD patients with operationally defined euthymia, schizophrenic patients in remission, and third group of healthy control patients. Comparisons were made after controlling for years of schooling and residual affective symptoms. Results: We found that overall both SZ and BD patients present deficits on all neurocognitive measures compared to healthy controls. In particular, SZ patients show more severe and pervasive cognitive deficits while BD patients present a milder and more confined impairment. In addition, evidence from the literature suggests that SZ and BD patients share a similar cognitive impairment profile with different degrees of deficits. Therefore, the difference between the two groups seems to be more quantitative (degree of deficit) rather than qualitative (profile), supporting a dimensional approach to the two clinical entities. Limitations of the present review includes the impossibility to control for effects of medication, varying time required for assessment across studies, illness diagnosis reliability, and course severity. Conclusion: Patients with BD might exhibit a cognitive impairment that could be similar to SZ in terms of their profile, although patients with SZ may have more severe and widespread impairments.
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spelling pubmed-37374612013-08-20 Cognitive Impairment in Bipolar Disorder and Schizophrenia: A Systematic Review Vöhringer, Paul A. Barroilhet, Sergio A. Amerio, Andrea Reale, Maria Laura Alvear, Katherine Vergne, Derick Ghaemi, S. Nassir Front Psychiatry Psychiatry Aims: Previous comparisons of cognitive decline among patients with bipolar disorder (BD) and schizophrenia (SZ) have found somehow quite similar profiles of deficits, but results have varied between studies. Therefore an extensive and thoughtful systematic review of the matter is warranted. Methods: Studies were found through systematic search (PubMed) following PRISMA guidelines. To be included, studies must have assessed the following cognitive functions: executive functions, memory, IQ, attention-concentration, and perceptuomotor function. In order to make comparison between the two entities, studies should include BD patients with operationally defined euthymia, schizophrenic patients in remission, and third group of healthy control patients. Comparisons were made after controlling for years of schooling and residual affective symptoms. Results: We found that overall both SZ and BD patients present deficits on all neurocognitive measures compared to healthy controls. In particular, SZ patients show more severe and pervasive cognitive deficits while BD patients present a milder and more confined impairment. In addition, evidence from the literature suggests that SZ and BD patients share a similar cognitive impairment profile with different degrees of deficits. Therefore, the difference between the two groups seems to be more quantitative (degree of deficit) rather than qualitative (profile), supporting a dimensional approach to the two clinical entities. Limitations of the present review includes the impossibility to control for effects of medication, varying time required for assessment across studies, illness diagnosis reliability, and course severity. Conclusion: Patients with BD might exhibit a cognitive impairment that could be similar to SZ in terms of their profile, although patients with SZ may have more severe and widespread impairments. Frontiers Media S.A. 2013-08-08 /pmc/articles/PMC3737461/ /pubmed/23964248 http://dx.doi.org/10.3389/fpsyt.2013.00087 Text en Copyright © 2013 Vöhringer, Barroilhet, Amerio, Reale, Alvear, Vergne and Ghaemi. http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Psychiatry
Vöhringer, Paul A.
Barroilhet, Sergio A.
Amerio, Andrea
Reale, Maria Laura
Alvear, Katherine
Vergne, Derick
Ghaemi, S. Nassir
Cognitive Impairment in Bipolar Disorder and Schizophrenia: A Systematic Review
title Cognitive Impairment in Bipolar Disorder and Schizophrenia: A Systematic Review
title_full Cognitive Impairment in Bipolar Disorder and Schizophrenia: A Systematic Review
title_fullStr Cognitive Impairment in Bipolar Disorder and Schizophrenia: A Systematic Review
title_full_unstemmed Cognitive Impairment in Bipolar Disorder and Schizophrenia: A Systematic Review
title_short Cognitive Impairment in Bipolar Disorder and Schizophrenia: A Systematic Review
title_sort cognitive impairment in bipolar disorder and schizophrenia: a systematic review
topic Psychiatry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3737461/
https://www.ncbi.nlm.nih.gov/pubmed/23964248
http://dx.doi.org/10.3389/fpsyt.2013.00087
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