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Cognitive Decline and Illness Progression in Bipolar Disorder.
Isabella S Ji1,2, Kayla M Teopiz1,3, William Cheung1
1Brain and Cognition Discovery Foundation, 77 Bloor Street West, Suite 617, Toronto, ON, M5S 1M2, Canada.
Advances in Therapy
|March 2, 2026
Summary
Bipolar disorder (BD) is linked to cognitive decline, with some studies showing worse executive function and memory with more mood episodes or longer illness duration. However, findings are mixed, and more research is needed.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Bipolar disorder (BD) is a chronic condition characterized by significant cognitive deficits.
- Impaired executive function, memory, and processing speed are common in adults with BD.
- Cognitive impairment is a key therapeutic target in BD management.
Purpose of the Study:
- To systematically review evidence on the association between clinical markers of illness progression and cognitive decline in adults with BD.
- To synthesize findings regarding the impact of illness duration and mood episode count on cognitive function.
Main Methods:
- Systematic literature search of PubMed, OVID (PsycINFO), and Scopus.
- Included studies compared adults (≥18 years) with BD (I, II, or mixed) based on illness progression markers.
- Primary outcome was cognitive function assessed via validated neuropsychological tests; various study designs were eligible.
Main Results:
- Cross-sectional studies indicate that more mood episodes or longer illness duration correlate with poorer executive function and memory in BD.
- Conversely, longitudinal studies found no significant cognitive changes over time in individuals with BD compared to controls.
- Evidence regarding illness progression markers and cognitive decline in BD is inconsistent.
Conclusions:
- The relationship between illness progression markers and cognitive decline in bipolar disorder is complex and not fully understood.
- Mixed findings highlight the need for robust research designs.
- Future studies should employ large-scale longitudinal approaches incorporating biomarkers and neuroimaging to elucidate mechanisms of cognitive worsening in BD.
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