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Aetiological considerations and risk factors for multi-infarct dementia
J S Meyer1, K L McClintic, R L Rogers
1Cerebral Blood Flow Laboratory, VA Medical Center, Houston, Texas 77211.
Insights
Multi-infarct dementia (MID) is often linked to stroke risk factors like hypertension and heart disease. Lesion location, not volume, significantly impacts cognitive decline in MID patients.
Area of Science:
- Neurology
- Vascular Neurology
- Geriatrics
Background:
- Multi-infarct dementia (MID) is a significant cause of cognitive impairment.
- Understanding the underlying cerebrovascular pathology and associated risk factors is crucial for diagnosis and management.
Purpose of the Study:
- To evaluate risk factors for stroke in patients with multi-infarct dementia (MID).
- To identify the types of cerebrovascular lesions present in MID patients.
- To investigate the relationship between cerebral blood flow, lesion characteristics, and cognitive impairment.
Main Methods:
- Retrospective analysis of 175 MID patients.
- Assessment of stroke risk factors including hypertension, heart disease, smoking, diabetes, alcohol consumption, and hyperlipidemia.
- Classification of cerebrovascular lesions (lacunar infarctions, atherosclerotic occlusive disease, embolic infarctions).
- Measurement of cerebral blood flow (CBF) and correlation with lesion types and cognitive status.
Main Results:
- Hypertension (66%) and heart disease (47%) were the most common risk factors.
- Multiple lacunar infarctions were the most frequent lesion type (43%), often combined with other strokes.
- Lower CBF values were associated with extracranial occlusive disease and/or multiple lacunar infarctions.
- Lesion location was a stronger predictor of cognitive impairment than lesion volume.
- MID was more prevalent in men (62%).
Conclusions:
- Hypertension and heart disease are key risk factors in MID.
- Cerebral blood flow is reduced in MID patients with specific vascular pathologies.
- The topographical distribution of cerebral infarctions is critical for cognitive outcomes in MID.
Abstract:
One hundred and seventy five multi-infarct dementia (MID) patients were evaluated for risk factors for stroke as well as for the types of cerebrovascular lesions that were present. The incidence of associated risk factors for stroke were as follows: hypertension (66%), heart disease (47%), cigarette smoking (37%), diabetes mellitus (20%), moderate alcohol consumption (19%) and hyperlipidaemia (21%). The most frequently occurring type of lesions were multiple lacunar infarctions of the brain (43%). These were combined with other types of stroke in an additional 21%. Atherosclerotic occlusive disease of the carotid and vertebrobasilar arteries occurred alone in 18% and was associated with other types of stroke in another 25%. Embolic cerebral infarctions were present alone in 8% and were combined with other types of stroke in 15%. MID was more frequent in men (62%) than women (p less than 0.002). Mean bihemispheric gray matter cerebral blood flow (CBF) values showed a fluctuating course and when results were pooled and compared between different types of MID, extracranial occlusive disease and/or multiple lacunar infarctions resulted in lowest CBF values. The location of cerebral infarctions was more importantly related to cognitive impairments than was the total volume of infarcted brain. Mortality rates among 125 MID patients followed for 31 months has been 5%. Correct clinical classification of the types of cerebrovascular lesions was confirmed in three necropsied cases.