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. 2024 Jan 26:15:1343463.
doi: 10.3389/fpsyt.2024.1343463. eCollection 2024.

White matter hyperintensities in bipolar disorder: systematic review and meta-analysis

Tânia Silva  1   2   3 , Cesar Nunes  4 , Andreia Ribeiro  1   3 , Isabel Santana  2   3   5 , Joaquim Cerejeira  2   3
Affiliations

White matter hyperintensities in bipolar disorder: systematic review and meta-analysis

Tânia Silva et al. Front Psychiatry. .

Abstract

Background: White matter hyperintensities are lesions of presumed vascular origin associated with Cerebral small vessel disease. WMH are common findings that and are associated with increased risk of cognitive impairment and dementia. A higher prevalence of WMH has been also reported in patients with bipolar disorder (BD), although the evidence is conflicting.

Objective: To compare the prevalence of WMH in adults with BD, with the prevalence found in healthy controls.

Methods: We searched the Embase, Medline/PubMed, and references cited in articles retrieved on May 20, 2023. We included case-control studies that compared the prevalence of WMH in adult BD patients with the prevalence of WMH in healthy controls, using T2-weighted magnetic resonance imaging. We performed a meta-analysis using a random-effects method based on the inverse-variance approach.

Findings: We included 22 case-control studies reporting data of 1313 people. The overall rate of WMH was 46.5% in BD patients and 28% in controls (pooled Odds Ratio 2.89, 95% CI 1.76; 4.75). We found a moderate heterogeneity across studies (I2 = 0.49). Publication bias was not significant.

Interpretation: We found evidence that BD patients have a higher burden of WMH than healthy controls. Main limitations were impossibility of analyzing gender differences and bipolar type, moderate heterogeneity between studies, non-representative samples, lack of control for major confounders and search in two electronic databases.

Systematic review registration: https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42023428464.

Keywords: bipolar disorder; cerebral small vessel disease; cerebrovascular disease; microvascular disease; mood disorder; white matter hyperintensities; white matter lesions.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
PRISMA flow diagram for study selection (10).
Figure 2
Figure 2
Forrest plot of all studies included in the meta-analysis. Columns - study number, year and author, effect size, lower and upper 95% CI, Weight (%), total number of participants, number of subjects with white matter hyperintensities.
Figure 3
Figure 3
Funnel plot used to assess publication bias among the included studies.
See this image and copyright information in PMC

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