Metabolic syndrome, inflammation, and nonamnestic mild cognitive impairment in older persons: a population-based

Rosebud O Roberts1, Yonas E Geda, David S Knopman

  • 1Department of Health Sciences Research, Mayo Clinic, Rochester, MN, USA. roberts.rosebud@-mayo.edu

Insights

Metabolic syndrome (MetS) combined with inflammation is linked to nonamnestic mild cognitive impairment (na-MCI) in older adults. This suggests inflammation plays a key role in specific types of cognitive decline.

Area of Science:

  • Neurology
  • Gerontology
  • Internal Medicine

Background:

  • Metabolic syndrome (MetS) is increasingly recognized for its association with cognitive impairment.
  • The interplay between MetS, inflammation, and different subtypes of mild cognitive impairment (MCI) requires further investigation.
  • Understanding these relationships is crucial for identifying specific risk factors and potential interventions for cognitive decline in aging populations.

Purpose of the Study:

  • To investigate the association between metabolic syndrome (MetS), with and without inflammation, and mild cognitive impairment (MCI).
  • To differentiate the impact of MetS and inflammation on amnestic MCI (a-MCI) versus nonamnestic MCI (na-MCI).
  • To explore potential etiologic differences between MCI subtypes based on metabolic and inflammatory profiles.

Main Methods:

  • A randomly selected cohort of 1969 participants aged 70-89 years was studied.
  • Participants underwent neurologic evaluation, neuropsychologic testing, and biochemical assays for inflammation markers like C-reactive protein (CRP).
  • Diagnoses included normal cognition, MCI (a-MCI and na-MCI), and dementia; MetS components were clinically ascertained and biochemically confirmed.

Main Results:

  • Metabolic syndrome (MetS) alone was not significantly associated with either nonamnestic MCI (na-MCI) or amnestic MCI (a-MCI).
  • High C-reactive protein (CRP) levels were associated with na-MCI but not a-MCI.
  • The combination of MetS and high CRP was significantly associated with na-MCI, but not with a-MCI.

Conclusions:

  • The combined presence of metabolic syndrome and high inflammation is specifically associated with nonamnestic mild cognitive impairment in the elderly.
  • These findings suggest distinct underlying etiologies for different subtypes of mild cognitive impairment.
  • Inflammation appears to be a critical factor mediating the relationship between MetS and specific forms of cognitive impairment.

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