Cited by 34Bipolar Disorder and TreatmentSchizophrenia research and treatmentPersonality Disorders and Psychopathology

Effects of illness duration on cognitive performances in bipolar depression are mediated by white matter microstructure

Melloni, Elisa M.T., Poletti, Sara, Vai, Benedetta, Bollettini, Irene, Colombo, Cristina, Benedetti, Francesco·2019·Journal of Affective Disorders

Abstract

Background Cognitive deficits are a core feature of bipolar disorder (BD), and persist during the euthymic phase. White matter (WM) microstructural abnormalities are widely considered a structural marker of BD. Features of illness chronicity, such as illness duration and number of mood episodes, have been associated with worsening of both clinical profile and brain structural alterations. This study examined the role of WM integrity as a possible mediator between illness duration and cognitive performances in a sample of BD patients.Methods We assessed 88 inpatients affected by a depressive episode in course of type I BD for verbal memory, visual memory, working memory, visuospatial constructional abilities, psychomotor coordination, executive functions, processing speed, and verbal fluency. White matter integrity was evaluated through FA measurements derived using the Enhancing Neuro Imaging Genetics Through Meta-Analysis (ENIGMA)-DTI protocol.Results The effect of illness duration on processing speed, verbal memory, and visual memory was mediated by the FA values of bilateral anterior corona radiata, bilateral corona radiata, genu of corpus callosum, and fornix, adjusting for age, sex, education and lithium treatment (p < 0.05).Limitations Potential interaction factors were not examined in this study.Conclusions This is the first study to show the role of WM integrity as a mediator of the negative effect of illness duration on cognitive performances. Our data provide new insight into the neuroprogressive hypothesis of BD.

Integrity signals

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Crossref · 10.1016/j.jad.2019.02.015

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Authors
Melloni, E. M. T., Poletti, S., Vai, B., Bollettini, I., Colombo, C., & Benedetti, F.
Affiliations
  • Vita-Salute San Raffaele University (IT)
  • IRCCS Ospedale San Raffaele (IT)
Corresponding author
Melloni, Elisa M.T.
Venue
Journal of Affective Disorders
Publisher
Elsevier BV
Published
2019-04
Volume
249
Pages
175-182
ISSN
0165-0327 (ISSN-L)
OpenAlex
W2912016006
Cited by
34
References
124
Citations by year
2026: 4 · 2025: 3 · 2024: 3 · 2023: 5 · 2022: 6 · 2021: 8 · 2020: 4 · 2019: 1
FWCI
3.78
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Affective Disorders (publishedVersion)
  • PubMed (publishedVersion)
  • Archivio Istituzionale della Ricerca - Università Vita-Salute San Raffaele (submittedVersion)
Funders
Ministry of Health
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Bipolar Disorder and Treatment
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Social Sciences › Psychology › Clinical Psychology › Personality Disorders and Psychopathology
Keywords
bipolar depression, disease duration, cognitive impairment, white matter microstructure, fractional anisotropy, mediation analysis, processing speed, verbal memory, visual memory, corpus callosum, fornix, executive function, lithium therapy
MeSH terms
Adult, Bipolar Disorder, Cognition, Corpus Callosum, Depression, Female, Humans, Male, Memory, Short-Term, Middle Aged, Case-Control Studies, Executive Function, Cognitive Dysfunction, White Matter

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