Mild cognitive impairment: Same identity for different entities

Laura Serra, Giovanni Giulietti, Mara Cercignani, Barbara Spanò, Mario Torso, Diana Castelli, Roberta Perri, Lucia Fadda, Camillo Marra, Carlo Caltagirone, Marco Bozzali

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigates whether different patterns of grey matter (GM) loss may account for the different neuropsychological profiles observed in patients with amnestic (a-) and non-amnestic (na-) mild cognitive impairment (MCI), and may predict patients' clinical evolution. Fifty-five consecutive individuals complaining of cognitive dysfunction (referred to specialist dementia clinics) were screened and included in the study if they met the diagnostic criteria for MCI on a neurodegenerative basis. After an extensive neuropsychological assessment, patients were classified as suffering from a-MCI or na-MCI. Twenty-eight healthy individuals were also recruited and served as controls. All participants underwent magnetic resonance imaging at 3T, including conventional images and volumetric scans. Volumetric data were processed using voxel-based morphometry to assess between-group differences in regional GM volumes and correlations with neuropsychological performances. When compared to controls, a-MCI patients showed prominent GM volume reductions in the medial temporal lobes, while those with na-MCI showed reduced GM volumes in the orbito-frontal cortex and basal ganglia. In a-MCI patients, significant associations were found between verbal long-term memory performance and GM volumes in the hippocampus. Conversely, in na-MCI patients, associations were found between scores at tests exploring executive functions and GM volumes in the orbito-frontal cortex. At one-year follow-up, conversions were recorded exclusively toward Alzheimer's disease (AD) in the a-MCI group, and toward non-AD dementia in the na-MCI group. This study confirms that MCI is a heterogeneous clinical identity including different neurodegenerative entities; specific patterns of regional GM loss appear to account for specific neuropsychological features and are likely to predict patients' clinical evolution.

Original languageEnglish
Pages (from-to)1157-1165
Number of pages9
JournalJournal of Alzheimer's Disease
Volume33
Issue number4
DOIs
Publication statusPublished - 2013

Keywords

  • Alzheimer's disease
  • amnestic mild cognitive impairment
  • magnetic resonance imaging
  • non-amnestic mild cognitive impairment
  • voxel-based morphometry

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Geriatrics and Gerontology
  • Clinical Psychology

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