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Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
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The borderland between normal aging and dementia.

Raymond Y Lo1

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Summary
This summary is machine-generated.

Early Alzheimer's disease (AD) diagnosis is crucial, as current treatments are ineffective once neurodegeneration is advanced. Mild cognitive impairment (MCI) is a proposed early stage, but its heterogeneity complicates diagnosis and prediction of dementia.

Keywords:
Alzheimer's diseaseDementiaMild cognitive impairmentNormal aging

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Area of Science:

  • Gerontology
  • Neurology
  • Cognitive Science

Background:

  • Alzheimer's disease (AD) is a growing global health concern with no effective preventative or curative treatments.
  • Delayed diagnosis of AD hinders treatment efficacy, as significant neurodegeneration occurs before clinical detection.
  • Mild cognitive impairment (MCI) was proposed to identify patients in predementia stages for therapeutic intervention, but its heterogeneity poses challenges.

Purpose of the Study:

  • To review the conceptual evolution of MCI as a transitional stage between normal aging and dementia.
  • To propose that environmental and sociocultural factors are critical for diagnosing dementia.
  • To critique the nosological validity of MCI and advocate for a broader understanding of dementia.

Main Methods:

  • Conceptual review of MCI's evolution and its relationship to dementia.
  • Analysis of dementia as a complex outcome influenced by individual interaction with cognitive challenges.
  • Discussion of limitations in focusing solely on amyloid pathology for AD etiology.

Main Results:

  • MCI is heterogeneous and lacks a clear diagnostic prototype, unlike established AD criteria.
  • Dementia diagnosis requires consideration of built environment and sociocultural context beyond biomedical factors.
  • Current diagnostic and therapeutic approaches for AD and MCI are insufficient due to complexity and delayed detection.

Conclusions:

  • Rethinking dementia diagnosis to include environmental and social factors is necessary.
  • The current paradigm of dementia care may need to shift towards early AD pathology detection and integrated chronic disease management in the elderly.
  • Further research into the multifactorial nature of dementia, beyond amyloid pathology, is essential for effective interventions.