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Vascular dementia, a new beginning: shifting focus from clinical phenotype to ischemic brain injury
1Department of Neurology, University of Southern California Los Angeles, Los Angeles, USA. chui@hsc.usc.edu
Insights
Vascular dementia stems from brain damage due to stroke. Effective stroke prevention may reduce cognitive impairment, but chronic ischemia also causes significant brain injury and warrants more attention.
Area of Science:
- Neurology
- Neuroscience
- Vascular Biology
Background:
- Dementia can arise from complete or incomplete brain infarction affecting memory and cognition.
- Effective stroke treatments are presumed to lower vascular cognitive impairment risk.
- Incomplete infarction from chronic or subclinical ischemia is a significant, yet neglected, cause of brain injury.
Purpose of the Study:
- To highlight the role of incomplete infarction in ischemic brain injury.
- To advocate for a broader focus on preventing and treating the spectrum of ischemic brain injury.
Main Methods:
- Review of existing literature on stroke, dementia, and ischemic brain injury.
- Analysis of the contribution of different infarction types to cognitive decline.
Main Results:
- Complete infarction (stroke) is a known cause of dementia.
- Incomplete infarction, often from chronic or subclinical ischemia, is an under-recognized cause of brain injury and cognitive impairment.
- Current interventions primarily target acute stroke, potentially overlooking chronic ischemic damage.
Conclusions:
- A shift in focus from vascular dementia to the broader spectrum of ischemic brain injury is recommended.
- Preventing and ameliorating chronic and subclinical ischemic brain injury is crucial for cognitive health.
- Further research into the mechanisms and treatments for incomplete infarction is warranted.
Abstract:
Dementia may result from complete or incomplete infarction of brain regions subserving memory and cognition. Several effective treatments reduce the risk of initial and recurrent stroke. Presumably, these interventions reduce the risk of vascular cognitive impairment. Incomplete infarction caused by recurrent, chronic, or subclinical ischemia appears to represent another important cause of ischemic brain injury, but has been relatively neglected. A shift in focus from the serendipitous clinical phenotype of vascular dementia to preventing and ameliorating the broad spectrum of ischemic brain injury is recommended.