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Vascular dementia: a changing concept
1Department of Neurology, University of Heidelberg, Klinikum Mannheim, Germany.
Insights
Vascular dementia is evolving beyond artery thickening. Advanced brain imaging reveals diverse causes, including vessel diseases, specific brain lesions, and genetic factors like CADASIL, refining dementia classification.
Area of Science:
- Neurology
- Neuroscience
- Medical Imaging
Background:
- Traditional vascular dementia concepts focused on diffuse cerebral blood flow reduction due to artery thickening.
- Recent advancements in brain imaging have broadened the understanding of vascular dementia's underlying mechanisms.
- Existing classifications are being refined to encompass diverse pathological pathways and etiological factors.
Purpose of the Study:
- To review and update the classification of vascular dementia based on current understanding.
- To differentiate between various pathomechanisms contributing to vascular dementia.
- To highlight the role of neuroimaging and genetics in diagnosing vascular dementia.
Main Methods:
- Review of current literature on vascular dementia.
- Analysis of neuroimaging findings in different vascular dementia subtypes.
- Inclusion of genetic factors in the classification of non-atherosclerotic vascular dementia.
Main Results:
- Vascular dementia classification now distinguishes between large- and small-vessel diseases.
- Specific brain regions and lesion types (infarctions, lacunes, white matter lesions) are key diagnostic features.
- Genetic conditions like Cerebral Autosomal-Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CADASIL) are recognized causes.
Conclusions:
- The concept of vascular dementia has evolved significantly with technological advancements.
- A multi-faceted approach, considering vessel size, affected brain areas, and genetics, is crucial for accurate classification.
- Dementia due to non-vascular mechanisms must be clearly separated from vascular dementia subtypes.
Abstract:
The traditional concept of vascular dementia implied the thickening of arteries of the brain as a source of diffuse reduction of cerebral blood flow leading to neuronal death, cerebral atrophy, and finally dementia. Although this concept has been recently revived, with the increasing use of brain imaging technologies, new concepts of vascular dementia came into view. Present classification tends to separate various pathomechanisms (large- and small-vessel disease), to define different brain territories involved (strategic infarctions, cortico-subcortical and subcortical lacunes, borderzone/junctional zone infarctions, and white matter lesions) and most recently even genetics dispositions to vascular dementia of nonatherosclerotic etiology (CADASIL). Dementia caused by other mechanisms are separated from the aforementioned.