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Related Experiment Videos

Conversion to dementia from mild cognitive disorder: the Cache County Study.

J T Tschanz1, K A Welsh-Bohmer, C G Lyketsos

  • 1Department of Psychology, Utah State University, Logan, USA. joannt@cc.usu.edu

Neurology
|July 26, 2006
PubMed
Summary
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Individuals with mild cognitive impairment (MCI) face a significantly higher risk of dementia over three years, especially if they carry the APOE epsilon4 gene. Dementia surveillance is recommended for broader groups with MCI.

Area of Science:

  • Neurology
  • Geriatrics
  • Epidemiology

Background:

  • Mild cognitive impairment (MCI) is a precursor to dementia, but conversion rates vary.
  • Identifying risk factors for dementia conversion is crucial for early intervention.

Purpose of the Study:

  • To investigate 3-year dementia conversion rates in a population-based sample with diverse mild cognitive impairments.
  • To identify risk factors, including APOE epsilon4 genotype, associated with dementia conversion.

Main Methods:

  • A population-based sample of elderly residents underwent two waves of dementia screening.
  • Three-year follow-up data were analyzed for 120 participants with mild cognitive impairment at baseline.
  • Participants were categorized into prodromal Alzheimer disease (proAD) or other cognitive syndromes (CS).

Related Experiment Videos

Main Results:

  • The 3-year dementia conversion rate was 46% for those with mild cognitive impairment, compared to 3.3% for cognitively unimpaired individuals.
  • Alzheimer disease was the most common dementia type among converters.
  • Individuals with at least one APOE epsilon4 allele showed a substantially higher risk of dementia conversion (22- to 25-fold) compared to those without the allele.

Conclusions:

  • All types of mild cognitive impairment are associated with an elevated dementia risk over 3 years.
  • The APOE epsilon4 allele significantly amplifies this risk, highlighting its prognostic utility.
  • Dementia surveillance is valuable for a broad range of cognitively impaired individuals, not just specific categories.