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Mild cognitive impairment: a concept in evolution.

R C Petersen1, B Caracciolo, C Brayne

  • 1From the Mayo Alzheimer's Disease Research Center, Mayo Clinic College of Medicine, Rochester, MN, USA.

Journal of Internal Medicine
|March 11, 2014
PubMed
Summary
This summary is machine-generated.

Mild cognitive impairment (MCI) criteria remain stable, but study discrepancies highlight the need for standardized operationalization. Further research is essential for refining MCI classification and biomarker integration.

Keywords:
Alzheimer's diseasedementiamemory impairmentmild cognitive impairment

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Area of Science:

  • Gerontology
  • Neurology
  • Cognitive Science

Background:

  • The definition of mild cognitive impairment (MCI) has evolved since 2003, establishing it as a key area between normal cognition and dementia.
  • MCI is widely utilized globally in clinical practice and research to identify individuals with cognitive changes.
  • Extensive data on MCI prevalence, risk factors, and progression exist, yet inconsistencies persist across studies.

Purpose of the Study:

  • To review the evolution and current status of the mild cognitive impairment (MCI) construct.
  • To identify reasons for discrepancies in MCI research findings.
  • To propose future directions for refining the MCI construct and its clinical application.

Main Methods:

  • Review of the literature on mild cognitive impairment (MCI) definitions and applications.
  • Analysis of factors contributing to variability in MCI research outcomes.
  • Discussion of controversial issues and future research needs in MCI.

Main Results:

  • Core MCI criteria have remained consistent since 2003, despite construct evolution.
  • Discrepancies in MCI studies are largely attributed to variations in operationalization, study settings, subject selection, and follow-up duration.
  • Key areas for further exploration include algorithmic vs. clinical classification, reliability of clinical judgment, cognitive performance changes, and biomarker predictivity.

Conclusions:

  • Standardizing MCI criteria and operationalization is crucial for reducing study discrepancies.
  • Tailoring MCI criteria to specific populations and contexts, alongside biomarker integration, holds promise for advancing the construct.
  • Longitudinal, population-based studies are needed to enhance uniformity and clarify issues in cognitive aging and MCI research.