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Cognitive dysfunction in patients with cerebral microbleeds on T2*-weighted gradient-echo MRI
David J Werring1, Duncan W Frazer, Lucy J Coward
1Stroke Research Group, Department of Clinical Neurology, Institute of Neurology, University College London, Queen Square, London WC1N 3BG, UK.
Brain : a Journal of Neurology
|July 30, 2004
Summary
Cerebral microbleeds, detected by MRI, are linked to cognitive dysfunction, particularly executive impairment. This suggests microbleeds may impact brain function beyond silent white matter changes.
Area of Science:
- Neuroimaging and Neurology
- Cerebrovascular Disease Research
- Cognitive Neuroscience
Background:
- Cerebral microbleeds (CMBs) are small lesions detected by gradient echo T2*-weighted MRI.
- CMBs are associated with intracerebral hemorrhage, hypertension, and small vessel disease.
- Previously considered clinically silent, their widespread distribution suggests potential cognitive impact.
Purpose of the Study:
- To investigate the hypothesis that cerebral microbleeds cause cognitive dysfunction.
- To compare cognitive function in patients with and without CMBs, controlling for confounding factors.
Main Methods:
- A case-control study involving 25 patients with CMBs and 30 matched controls.
- Groups were matched for age, IQ, white matter changes, stroke location, and stroke subtypes.
- Neuropsychological testing assessed intellectual function, memory, attention, and executive function.
Main Results:
- Executive dysfunction was significantly more prevalent in patients with CMBs (60% vs. 30%).
- CMBs were an independent predictor of executive impairment, irrespective of white matter changes.
- Frontal and basal ganglia microbleed counts correlated with executive dysfunction severity.
Conclusions:
- Cerebral microbleeds are associated with cognitive dysfunction, especially executive impairment.
- This effect is independent of other cerebrovascular changes like white matter disease.
- Findings highlight the clinical relevance of CMBs in stroke patients with cognitive deficits.