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Accelerated hippocampal atrophy rates in stable and progressive amnestic mild cognitive impairment

Pei-Ning Wang1, Hsiu-Chih Liu, Jiing-Feng Lirng

  • 1Department of Neurology, National Yang-Ming University School of Medicine, Taipei, Taiwan. pnwang@vghtpe.gov.tw

Psychiatry Research
|February 17, 2009
PubMed

Insights

Accelerated hippocampal atrophy, a key indicator of brain shrinkage, may signal Alzheimer's disease progression in individuals with mild cognitive impairment (MCI). This finding is crucial for early diagnosis and intervention strategies.

Area of Science:

  • Neuroscience
  • Gerontology
  • Radiology

Background:

  • Smaller hippocampal volume is linked to Alzheimer's disease (AD) risk in mild cognitive impairment (MCI).
  • Limited research exists on cognitive and hippocampal volume decline rates in stable MCI.
  • The influence of apolipoprotein E (ApoE) on medial temporal structures and cognition changes in MCI is understudied.

Purpose of the Study:

  • To investigate the rates of cognitive decline and hippocampal volume changes in amnestic MCI.
  • To examine the impact of apolipoprotein E (ApoE) genotype on these decline rates.
  • To identify predictors of conversion from MCI to AD.

Main Methods:

  • Annual neuropsychological and MRI assessments were conducted on 58 amnestic MCI subjects and 20 controls.
  • Annual decline rates in cognition, hippocampal, and amygdalar volumes were calculated.
  • ApoE genotyping was performed, and logistic regression analyzed conversion predictors.

Main Results:

  • Nineteen (32.7%) MCI subjects converted to AD within an average follow-up of 22.5 months.
  • Annual hippocampal atrophy rate correlated with memory decline; ApoE varepsilon4 did not significantly affect change rates.
  • Progressive MCI (MCI-P) showed higher cognitive and hippocampal volume decline rates than stable MCI (MCI-S) and controls.
  • Higher rates of hippocampal atrophy and cognitive decline predicted conversion to AD.
  • MCI-S subjects exhibited accelerated hippocampal atrophy compared to controls, despite minimal cognitive decline.

Conclusions:

  • Accelerated hippocampal atrophy is a significant early indicator in MCI subjects, potentially predicting progression to Alzheimer's disease.
  • Tracking hippocampal volume decline offers valuable insights into MCI progression and AD conversion risk.
  • While ApoE varepsilon4 status did not influence rates in this cohort, hippocampal atrophy itself is a critical marker.

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