Alzheimer's disease and vascular dementia: one potentially preventable and modifiable disease. Part I: Pathology,...

Area of Science:

• Neurology
• Geriatrics
• Neuroscience

Background:

• Alzheimer's disease (AD) and vascular dementia (VaD) frequently co-occur, suggesting a potential false dichotomy in their classification.
• Both neurodegenerative and cerebrovascular pathologies exhibit lengthy preclinical phases, often spanning decades.
• The clinical manifestation of dementia can disproportionately reflect the underlying neuropathology.

Purpose of the Study:

• To explore the frequent coexistence of Alzheimer's disease and vascular dementia.
• To discuss the implications of combined pathologies on diagnosis and understanding of cognitive impairment.
• To evaluate the proposed routine screening for dementia in older adults.

Main Methods:

• Review of existing literature on the neuropathology and clinical presentation of AD and VaD.
• Analysis of diagnostic criteria for dementia and mild cognitive impairment.
• Consideration of proposed government screening initiatives for cognitive decline.

Main Results:

• The distinction between AD and VaD is often blurred, with mixed pathologies being most common.
• Clinical symptoms may not directly correlate with the severity of neuropathological changes.
• The utility and ethical considerations of routine dementia screening in older populations are debated.

Conclusions:

• The separation of Alzheimer's disease and vascular dementia may be an oversimplification, as mixed pathologies are prevalent.
• Accurate diagnosis relies on clinical assessment, neuropsychological testing, and specialist evaluation.
• The implementation of widespread dementia screening requires careful consideration of its value, consent, and counseling protocols.