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Hippocampal and Amygdala Gray Matter Loss in Elderly Controls with Subtle Cognitive Decline
Univ Basel, Dept Psychiat, Basel, Switzerland.;Univ Psychiat Clin, Dept Neuropsychiat, Basel, Switzerland..
Univ Geneva, Fac Med, Dept Psychiat, Geneva, Switzerland..
Univ Basel, Dept Psychiat, Basel, Switzerland..
Univ Geneva, Fac Med, Dept Psychiat, Geneva, Switzerland..
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2017 (English)In: Frontiers in Aging Neuroscience, ISSN 1663-4365, E-ISSN 1663-4365, Vol. 9, article id 50Article in journal (Refereed) Published
Abstract [en]

In contrast to the idea that hippocampal and amygdala volume loss occur in late phases of neurodegeneration, recent contributions point to the relevance of preexisting structural deficits that are associated with aging and are independent of amyloid deposition in preclinical Alzheimer disease cases. The present work explores GM hippocampal and amygdala volumes in elderly controls displaying the first signs of cognitive decline. 455 subjects (263 females), including 374 controls (228 females) and 81 middle cognitive impairment subjects (35 females), underwent two neuropsychological evaluations (baseline and 18 months follow-up) and a MRI-T1 examination (only baseline). Clinical assessment included Mini-Mental State Examination (MMSE), Clinical Dementia Rating scale, Hospitalized Anxiety and Depression scale, the Consortium to Establish a Registry for Alzheimer's Disease neuropsychological battery and RI-48 Cued Recall Test (RI-48) for episodic memory. Based on their cognitive performance, we defined the controls as stable controls (sCON) and deteriorating controls (dCONs). Analyses included volumetric assessment, shape analyses and linear regressions between GM volume loss and differences in clinical scores between baseline and follow-up. Significant GM volume decrease in hippocampus bilaterally and right amygdala was found in dCON compared to sCON (p < 0.05). Lower right amygdala volumes were measured in mild cognitive impairment (MCI) compared to sCON (p < 0.05). Shape analyses revealed that atrophy was more pronounced at the superior-posterior lateral side of the hippocampus and amygdala. Significant correlations were found between GM volume of left hippocampus and the delta of MMSE and RI-48 scores in dCON and MCI groups separately. Decreased hippocampal and right amygdala volumes precede the first signs of cognitive decline in healthy elderly controls at the pre-MCI state. Left hippocampus volume may also predict short-term changes of overall cognition in these vulnerable cases.

Place, publisher, year, edition, pages
FRONTIERS MEDIA SA , 2017. Vol. 9, article id 50
Keywords [en]
hippocampus, amygdala, Alzheimer, FSL FIRST, MCI, cognitive impairment, deteriorating controls
National Category
Geriatrics Neurology
Identifiers
URN: urn:nbn:se:uu:diva-319537DOI: 10.3389/fnagi.2017.00050ISI: 000395558700002PubMedID: 28326035OAI: oai:DiVA.org:uu-319537DiVA, id: diva2:1087250
Available from: 2017-04-06 Created: 2017-04-06 Last updated: 2017-11-29Bibliographically approved

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