Cerebral PET glucose hypometabolism in subjects with mild cognitive impairment and higher EEG high-alpha/low-alpha frequency power ratio

Davide Vito Moretti, Michela Pievani, Lorenzo Pini, Ugo Paolo Guerra, Barbara Paghera, Giovanni Battista Frisoni

Research output: Contribution to journalArticlepeer-review

Abstract

In Alzheimer's disease (AD) research, both 2-deoxy-2-(18F)fluoro-D-glucose (FDG) positron emission tomography (PET) and electroencephalography (EEG) are reliable investigational modalities. The aim of this study was to investigate the associations between EEG High-alpha/Low-alpha (H-alpha/L-alpha) power ratio and cortical glucose metabolism. A total of 23 subjects with mild cognitive impairment (MCI) underwent FDG-PET and EEG examinations. H-alpha/L-alpha power ratio was computed for each subject and 2 groups were obtained based on the increase of the power ratio. The subjects with higher H-alpha/L-alpha power ratio showed a decrease in glucose metabolism in the hub brain areas previously identified as typically affected by AD pathology. In subjects with higher H-alpha/L-alpha ratio and lower metabolism, a “double alpha peak” was identified in the EEG spectrum and a U-shaped correlation between glucose metabolism and increase of H-alpha/L-alpha power ratio has been found. Moreover, in this group, a conversion rate of 62.5% at 24 months was detected, significantly different from the chance percentage expected. The neurophysiological meaning of the interplay between alpha oscillations and glucose metabolism and the possible interest of the H-alpha/L-alpha power ratio as a clinical biomarker in AD have been discussed.

Original languageEnglish
Pages (from-to)213-224
Number of pages12
JournalNeurobiology of Aging
Volume58
DOIs
Publication statusPublished - Oct 1 2017

Keywords

  • Alpha rhythm
  • CSF
  • EEG
  • MCI
  • MRI
  • PET

ASJC Scopus subject areas

  • Neuroscience(all)
  • Ageing
  • Developmental Biology
  • Geriatrics and Gerontology
  • Clinical Neurology

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