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Non-Alzheimer's amnestic mild cognitive impairment with medial temporal hypometabolism

Sebastiaan De Keersmaecker1, Steffi De Meyer1, Rik Vandenberghe1

  • 1KU/UZ Leuven Leuven Belgium.

Alzheimer'S & Dementia (Amsterdam, Netherlands)
|October 24, 2024
PubMed
Abstract

Insights

Patients with non-Alzheimer's amnestic mild cognitive impairment (aMCI) and medial temporal hypometabolism exhibit slower cognitive decline than those with Alzheimer's disease (AD). Distinct metabolic patterns were observed using FDG-PET imaging.

Area of Science:

  • Neurology
  • Neuroimaging
  • Cognitive Disorders

Background:

  • Alzheimer's disease (AD) biomarkers identify a subgroup of non-AD amnestic mild cognitive impairment (aMCI) patients with medial temporal hypometabolism on FDG-PET.
  • This metabolic pattern distinguishes aMCI patients who do not have AD but show specific brain changes.

Purpose of the Study:

  • To compare cognitive decline rates in non-AD aMCI patients with medial temporal hypometabolism versus AD patients.
  • To investigate the long-term diagnostic outcomes for non-AD aMCI patients.

Main Methods:

  • A consecutive series of 16 non-AD aMCI patients and 28 AD controls were followed for a median of 4.5 years.
  • Mini-Mental State Examination (MMSE) decline rate and final diagnoses were assessed.
  • Fluorodeoxyglucose-positron emission tomography (FDG-PET) was used to evaluate metabolic patterns.

Main Results:

  • Non-AD aMCI patients showed significantly slower MMSE decline (β = -0.51) compared to AD patients (β = -2.00).
  • FDG-PET revealed more pronounced medial temporal hypometabolism in non-AD aMCI and inferior parietal lobule hypometabolism in AD.
  • Five non-AD aMCI cases (approx. 31%) later developed frontotemporal dementia, and one developed dementia with Lewy bodies.

Conclusions:

  • Non-AD aMCI patients with medial temporal hypometabolism experience a slower rate of cognitive decline than AD patients.
  • FDG-PET can differentiate metabolic patterns between these groups.
  • A significant proportion of non-AD aMCI cases progress to other dementia types, highlighting the need for comprehensive biomarkers.
Keywords:
amyloid biomarkerscognitive declinedementia with Lewy bodies (DLB)frontotemporal dementia (FTD)medial temporal hypometabolismneurodegenerative diseasesneuropsychological assessmentnon‐AD amnestic mild cognitive impairment (non‐AD aMCI)

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