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Longitudinal 1H MRS changes in mild cognitive impairment and Alzheimer's disease

Kejal Kantarci1, Stephen D Weigand, Ronald C Petersen

  • 1Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA. kantarci.kejal@mayo.edu <kantarci.kejal@mayo.edu>

Neurobiology of Aging
|July 25, 2006
PubMed

Insights

Magnetic resonance spectroscopy reveals declining N-acetylaspartate/creatine ratios in mild cognitive impairment (MCI) and Alzheimer's disease (AD) patients. These metabolite ratios may track disease progression similarly to ventricular expansion.

Area of Science:

  • Neuroimaging
  • Biomarkers
  • Neurology

Background:

  • Magnetic resonance (MR)-based atrophy measurements are potential disease progression markers in amnestic mild cognitive impairment (MCI) and Alzheimer's disease (AD).
  • Longitudinal changes in proton magnetic resonance spectroscopy ((1)H MRS) metabolite markers are not well-characterized in MCI.
  • Understanding these changes is crucial for tracking disease progression.

Purpose of the Study:

  • To determine longitudinal (1)H MRS metabolite changes in MCI and AD patients.
  • To compare (1)H MRS metabolite ratios and ventricular volumes in tracking clinical disease progression in AD.
  • To investigate potential compensatory mechanisms in stable MCI.

Main Methods:

  • Longitudinal (1)H MR spectroscopy was performed on patients with MCI and AD.
  • Metabolite ratios (e.g., N-acetylaspartate/creatine, Choline/creatine) were analyzed.
  • Ventricular volumes were measured using MR-based methods.
  • Changes were compared between patient groups and cognitively normal elderly controls.

Main Results:

  • The N-acetylaspartate/creatine ratio, a marker of neuronal integrity, declined in both MCI and AD patients compared to controls.
  • (1)H MRS metabolite ratio changes correlated with clinical progression, comparable to ventricular expansion rates.
  • The Choline/creatine ratio declined in stable MCI patients compared to those who converted to AD and controls, suggesting a compensatory mechanism.

Conclusions:

  • Longitudinal (1)H MRS metabolite ratios show potential as useful markers for tracking Alzheimer's disease progression.
  • These metabolite changes may offer insights into the underlying pathophysiology of MCI and AD.
  • (1)H MRS can complement volumetric MR imaging in assessing disease progression.

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