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Clinicopathologic Factors Associated With Reversion to Normal Cognition in Patients With Mild Cognitive Impairment

Zonghua Li1, Michael G Heckman1, Takahisa Kanekiyo1

  • 1From the Department of Neuroscience (Z.L., T.K., Y.A.M., C.-C.L., N.Z., G.B.), Division of Biomedical Statistics and Informatics, Department of Quantitative Health Sciences (M.G.H.), Division of Behavioral Neurology (G.S.D.), and Neuroscience Graduate Program (G.B.), Mayo Clinic, Jacksonville, FL; Division of Epidemiology, Department of Quantitative Health Sciences (M.V.), and Department of Neurology (R.C.P.), Mayo Clinic, Rochester, MN; and Rush Alzheimer's Disease Center (D.A.B.), Rush University Medical Center, Chicago, IL.

Neurology
|March 22, 2022
PubMed
Abstract

Insights

Mild cognitive impairment (MCI) can revert to normal cognition, particularly in individuals with better preserved brain structure and glucose metabolism. This finding offers hope for cognitive recovery and reduced dementia risk.

Area of Science:

  • Neuroscience
  • Gerontology
  • Clinical Neurology

Background:

  • Mild cognitive impairment (MCI) is a transitional stage between normal cognition and dementia.
  • Understanding factors influencing MCI reversion to normal cognition is crucial for developing interventions.
  • Longitudinal studies are essential to track cognitive changes and identify predictive markers.

Purpose of the Study:

  • To identify clinicopathologic factors associated with the reversion of mild cognitive impairment (MCI) to normal cognition.
  • To compare cognitive outcomes and neuroimaging markers between MCI patients who revert and those who do not.
  • To assess the impact of MCI reversion on the risk of dementia progression.

Main Methods:

  • Analysis of three longitudinal cohorts: Mayo Clinic Study of Aging (MCSA), Religious Orders Study and Memory and Aging Project (ROSMAP), and National Alzheimer's Coordinating Center (NACC).
  • Comparison of demographic characteristics and clinical outcomes between MCI reverters and non-reverters.
  • Longitudinal assessment of cortical thickness, glucose metabolism, amyloid, and tau load using MRI or PET imaging in a subcohort.

Main Results:

  • A significant proportion of individuals with MCI experienced reversion to normal cognition across all cohorts (34.1%–66.8%).
  • MCI reverters showed a substantially increased chance of remaining cognitively normal and a reduced risk of dementia progression compared to non-reverters.
  • Reverters exhibited better-preserved cortical thickness and glucose metabolism, with a trend towards lower amyloid levels, but no difference in tau load.

Conclusions:

  • Reversion from mild cognitive impairment to normal cognition is a significant phenomenon observed in a substantial portion of affected individuals.
  • Preserved cortical structure and glucose metabolism are key factors associated with MCI reversion.
  • These findings highlight potential biomarkers and therapeutic targets for promoting cognitive recovery and preventing dementia.

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