De novo genesis of neuropsychiatric symptoms in mild cognitive impairment (MCI)

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Yonas E Geda1, Glenn E Smith, David S Knopman

  • 1Department of Psychiatry and Psychology, Mayo Clinic-Rochester, MN 55905, USA. Geda.yonas@mayo.edu

International Psychogeriatrics
|June 12, 2004
PubMed
Abstract

Insights

Mild Cognitive Impairment (MCI) shows distinct neuropsychiatric patterns, differing significantly from normal aging and early Alzheimer's Disease (AD). These findings highlight MCI as a transitional state with unique behavioral symptoms.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Gerontology

Background:

  • Mild Cognitive Impairment (MCI) lacks comprehensive understanding regarding its neuropsychiatric manifestations.
  • Existing research has not fully elucidated the behavioral symptom profile of MCI.

Purpose of the Study:

  • To characterize the neuropsychiatric profile of individuals with Mild Cognitive Impairment (MCI).
  • To compare the neuropsychiatric profiles of MCI patients with those of normal controls and individuals with early Alzheimer's Disease (AD).

Main Methods:

  • A cross-sectional study assessed psychiatric symptoms using the Neuropsychiatric Inventory (NPI) in normal controls, MCI patients, and mild AD patients.
  • Statistical analyses, including ANOVA, chi-squared, and Fisher's exact test, were employed to compare NPI scores among groups, controlling for age, education, Dementia Rating Scale (DRS), and Mini-Mental State Examination (MMSE) scores.

Main Results:

  • Significant differences in total NPI scores were observed among the three groups (p=0.0001).
  • Pair-wise comparisons revealed statistically significant differences in NPI domains between MCI and normal groups, and between MCI and AD groups (p=0.001).
  • These group differences in NPI scores persisted after controlling for age and education.

Conclusions:

  • The neuropsychiatric profile of MCI is distinct and aligns with its known clinical, neuroimaging, and neuropsychological characteristics.
  • These findings support the concept of MCI as a transitional 'gray zone' with overlapping features of normal aging and dementia.

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