AI Insight
This study examined brain structure in 41 patients with amnestic mild cognitive impairment (aMCI) compared to 38 healthy controls, tracking clinical outcomes over one year. Researchers found that aMCI patients showed reduced hippocampal and amygdala volumes, with those who progressed to Alzheimer's disease dementia also displaying thinner cortical gray matter. The findings suggest that specific patterns of brain atrophy, particularly cortical thinning, may help predict which aMCI patients will develop dementia.
Why it matters
Identifying structural brain markers that predict progression from mild cognitive impairment to dementia could enable earlier intervention and better patient stratification in clinical trials. These imaging biomarkers may help clinicians determine which patients require more aggressive monitoring or treatment, potentially improving care management for at-risk individuals.
Understand the Science
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Objective. To identify the structural features of the brain in patients with amnestic mild cognitive impairment (aMCI) compared to healthy individuals, as well as to detect structural markers of progression to dementia in aMCI subgroups with different clinical outcomes. Materials and Methods. 41 patients with aMCI (mean age 71.5{+/-}9.5 years, 33 females) who underwent clinical assessment during 1 year follow-up, and 38 healthy controls (mean age 63.7{+/-}11.7 years, 28 females) were included. MRI scans were acquired, and the cortical thickness in both hemispheres, as well as the volumes of subcortical structures and hippocampal subfields, were analyzed. Results. Patients with aMCI as a whole, as well as aMCI subgroups with different clinical outcomes, showed significantly smaller bilateral hippocampal volumes and volumes of several hippocampal subfields than healthy controls. In addition, patients who were subsequently diagnosed with Alzheimer’s disease dementia exhibited lower cortical gray matter thickness and smaller bilateral amygdala volumes than the healthy controls. Several subcortical structures and hippocampal subregions remained preserved in patients with aMCI, including those with unfavorable clinical outcomes. Conclusion. The study revealed structural brain abnormalities in aMCI, characterized by reduced hippocampal and hippocampal subfield volumes, as well as amygdala volume reduction, while other subcortical structures were relatively preserved. Furthermore, reduced cortical gray matter thickness may serve as a potential prognostic marker for conversion to dementia in patients with aMCI.
Source: Structural Brain Biomarkers for Identifying Progressive Amnestic Mild Cognitive Impairment