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Cerebral Microbleeds Are Associated with Impairments in Executive Function and Processing Speed
Xuanting Li1, Junliang Yuan2, Wei Qin1
1Department of Neurology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China.
Background:
Cerebral microbleed (CMB) is an increasingly important risk factor for cognitive impairment due to population aging. Controversies, however, remain regarding the exact association between CMB and cognitive dysfunction.
Objective:
We aimed to determine the relationship between CMB burden and cognitive impairment, and also explore the characteristics of cognitive decline in CMB patients for middle-aged and elderly people.
Methods:
The present cross-sectional study included 174 participants (87 CMB patients and 87 controls) who underwent brain magnetic resonance imaging and a battery of neuropsychological test. Global cognitive function was measured using Mini-Mental State Examination (MMSE) and Montreal Cognitive Assessment (MoCA). Compound z-scores were calculated for three cognitive subdomains: memory, executive function and processing speed.
Results:
CMB patients had lower scores of MMSE (p < 0.001) and MoCA (p < 0.001). Patients at each category of CMB count had worse performance in global cognitive function and all three cognitive subdomains (p < 0.001). In multiple linear regression models, CMB patients had significantly greater declines in executive function (p < 0.001), processing speed (p < 0.001), and MoCA (p = 0.003) with increasing number of CMB. We found no relationship between CMB location and cognition (p > 0.05).
Conclusion:
CMB is associated with impairment in global cognition as well as for all tested subdomains. Strongest effect sizes were seen for tests which rely on executive functioning, where performance deficits increased in proportion to degree of CMB burden. Prospective studies are needed to evaluate whether the association between CMB and executive dysfunction is causal.
Insights
Cerebral microbleeds (CMB) are linked to cognitive decline in middle-aged and elderly individuals. Higher CMB burden correlates with worse executive function, processing speed, and global cognition.
Area of Science:
- Neurology
- Neuroimaging
- Cognitive Science
Background:
- Cerebral microbleeds (CMB) are increasingly recognized as a risk factor for cognitive impairment, particularly in aging populations.
- The precise relationship between CMB and cognitive dysfunction remains a subject of ongoing research and debate.
Purpose of the Study:
- To investigate the association between the burden of cerebral microbleeds (CMB) and cognitive impairment.
- To characterize the patterns of cognitive decline in individuals with CMB, focusing on middle-aged and elderly populations.
Main Methods:
- A cross-sectional study involving 174 participants (87 with CMB, 87 controls).
- Participants underwent brain MRI and a comprehensive neuropsychological test battery.
- Global cognitive function assessed via MMSE and MoCA; cognitive subdomains (memory, executive function, processing speed) evaluated using z-scores.
Main Results:
- CMB patients exhibited significantly lower scores on MMSE and MoCA compared to controls.
- Worse performance in global cognition and all tested subdomains was observed across increasing categories of CMB count.
- Multiple regression analysis revealed that greater CMB burden was associated with significant declines in executive function, processing speed, and MoCA scores.
Conclusions:
- Cerebral microbleeds are associated with impairments in global cognition and specific cognitive domains, notably executive functioning.
- The severity of cognitive deficits, particularly in executive function, appears to increase proportionally with the CMB burden.
- Further prospective research is warranted to establish a causal link between CMB and executive dysfunction.
