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Infratentorial abnormalities in vascular dementia.
António J Bastos Leite1, Wiesje M van der Flier, Elisabeth C W van Straaten
1Department of Radiology and Image Analysis Center, VU University Medical Center, Amsterdam, The Netherlands. A.bastosleite@vumc.nl
Stroke
|December 13, 2005
Summary
Infratentorial abnormalities are common in vascular dementia (VaD) but typically don't impact cognition. However, midbrain atrophy in VaD patients is linked to worse cognitive test performance.
Area of Science:
- Neurology
- Neuroimaging
- Cognitive Science
Background:
- Infratentorial abnormalities may contribute to cognitive deficits.
- Current vascular dementia (VaD) criteria do not account for infratentorial changes.
- Understanding these abnormalities is crucial for refining VaD diagnosis and treatment.
Purpose of the Study:
- Determine the prevalence of infratentorial abnormalities in VaD patients.
- Investigate the relationship between infratentorial and supratentorial abnormalities.
- Assess the relevance of infratentorial abnormalities to cognitive function in VaD.
Main Methods:
- 182 probable VaD patients from a multicenter trial were analyzed.
- MRI scans assessed infratentorial vascular abnormalities, atrophy, and basilar artery characteristics.
- Cognitive function was evaluated using the Mini-Mental State Examination (MMSE) and VaDAS-cog.
Main Results:
- 77.5% of patients exhibited infratentorial abnormalities, including focal lesions and diffuse pontine changes.
- Midbrain atrophy was present in 11.0% of patients and correlated with global supratentorial atrophy.
- While infratentorial vascular abnormalities and cerebellar atrophy were not linked to cognitive impairment, midbrain atrophy was significantly associated with lower MMSE scores.
Conclusions:
- Infratentorial abnormalities are frequently observed in vascular dementia.
- Midbrain atrophy, specifically, emerged as a significant predictor of cognitive deficits in VaD patients.
- These findings suggest that midbrain atrophy should be considered in the assessment of cognitive impairment in VaD.