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Pathogenetic basis of vascular dementia
1Department of Psychiatry and Neurochemistry, University of Göteborg, St. Jörgen's Hospital, Hisings, Backa, Sweden.
Insights
Vascular dementia (VAD) may stem from subcortical white matter changes, not just brain infarcts. This study highlights myelin lipid decrease and blood-brain barrier dysfunction as key factors in VAD pathogenesis.
Area of Science:
- Neurology
- Neuroscience
- Pathology
Background:
- Vascular dementia (VAD) is often linked to brain infarcts and thromboembolism.
- The precise pathogenetic mechanisms underlying VAD require further elucidation.
- Existing diagnostic criteria for VAD involve dementia alongside cerebrovascular events.
Purpose of the Study:
- To investigate the pathogenetic aspects of Vascular dementia (VAD).
- To evaluate the role of brain infarcts versus other vascular pathologies in VAD.
- To identify alternative substrates contributing to VAD development.
Main Methods:
- Analysis of patients diagnosed with VAD based on dementia and vascular disease history.
- Utilized Computed Tomography (CT) to assess white matter lesions.
- Measured myelin lipid content and albumin ratio to assess blood-brain barrier (BBB) integrity.
Main Results:
- Frequent occurrence of CT white matter lesions (85%) in VAD patients.
- Pronounced decrease in myelin lipids observed in subcortical white matter.
- Increased albumin ratio indicated blood-brain barrier (BBB) dysfunction, independent of TIA/stroke.
- Brain infarcts appeared as endpoint manifestations, not primary causes.
Conclusions:
- Subcortical white matter changes, including myelin lipid reduction and BBB dysfunction, represent a significant VAD substrate.
- Findings challenge the sole reliance on thromboembolism and multiple cerebral infarcts (multi-infarct dementia) as the primary cause of VAD.
- Vascular dementia pathogenesis is likely multifactorial, involving white matter pathology beyond infarcts.
Abstract:
Vascular dementia (VAD) was studied with reference to pathogenetic aspects, especially the importance of brain infarcts. A VAD diagnosis was chosen when the patients showed dementia in combination with transitory ischemic attacks (TIA), stroke episodes, or other pronounced vascular diseases judged to be causally related to the dementia. Computed tomography (CT) white matter lesions were shown to occur frequently (85%); a pronounced decrease in myelin lipids was common in subcortical white matter; a fronto-subcortical symptom complex was the prevailing clinical pattern; and an overall increased albumin ratio without relation to TIA/stroke was noted, indicating blood-brain barrier (BBB) dysfunction. When infarcts were present, they appeared to be endpoint manifestations of the vascular pathology rather than the cause of the disease. Today, thromboembolism with multiple cerebral infarcts is considered more or less the only pathogenetic substrate of VAD, with multi-infarct dementia (MID) as its clinical counterpart. Our findings suggest that subcortical white matter changes are another important VAD substrate.