Age-Related Metabolic Profiles in Cognitively Healthy Elders: Results from a Voxel-Based [F-18]Fluorodeoxyglucose-Positron-Emission Tomography Study with Partial Volume Effects Correction

Autor(es):Mostrar menos -

Curiati, P. K. ^[1] ; Tamashiro-Duran, J. H. ^[1] ; Duran, F. L. S. ^[1] ; Buchpiguel, C. A. ^[1] ; Squarzoni, P. ^[1] ; Romano, D. C. ^[1] ; Vallada, H. ^[1] ; Menezes, P. R. ^[2] ; Scazufca, M. ^[3] ; Busatto, G. F. ^[1] ; Alves, T. C. T. F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Med, Neuroimaging Psychiat Lab, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Sch Med, Dept Prevent Med, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Sch Med, Dept Psychiat, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: AMERICAN JOURNAL OF NEURORADIOLOGY; v. 32, n. 3, p. 560-565, MAR 2011.
• Citações Web of Science: 27

Resumo

BACKGROUND AND PURPOSE: Functional brain variability has been scarcely investigated in cognitively healthy elderly subjects, and it is currently debated whether previous findings of regional metabolic variability are artifacts associated with brain atrophy. The primary purpose of this study was to test whether there is regional cerebral age-related hypometabolism specifically in later stages of life. MATERIALS AND METHODS: MR imaging and FDG-PET data were acquired from 55 cognitively healthy elderly subjects, and voxel-based linear correlations between age and GM volume or regional cerebral metabolism were conducted by using SPM5 in images with and without correction for PVE. To investigate sex-specific differences in the pattern of brain aging, we repeated the above voxelwise calculations after dividing our sample by sex. RESULTS: Our analysis revealed 2 large clusters of age-related metabolic decrease in the overall sample, 1 in the left orbitofrontal cortex and the other in the right temporolimbic region, encompassing the hippocampus, the parahippocampal gyrus, and the amygdala. The division of our sample by sex revealed significant sex-specific age-related metabolic decrease in the left temporolimbic region of men and in the left dorsolateral frontal cortex of women. When we applied atrophy correction to our PET data, none of the above-mentioned correlations remained significant. CONCLUSIONS: Our findings suggest that age-related functional brain variability in cognitively healthy elderly individuals is largely secondary to the degree of regional brain atrophy, and the findings provide support to the notion that appropriate PVE correction is a key tool in neuroimaging investigations. (AU)

• Processo FAPESP: 04/15336-5 - Alterações cerebrais associadas a fatores de risco cardiovascular: um estudo de base populacional usando morfometria voxel-a-voxel por ressonância magnética e medidas de metabolismo de glicose por tomografia por emissão de pósitrons
• Beneficiário: Geraldo Busatto Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 06/04405-1 - Alterações de ressonância magnética cerebral relacionadas ao envelhecimento: medidas de substâncias branca e cinzenta mensuradas por morfometria voxel-a-voxel em idosos saudáveis
• Beneficiário: Pedro Kallas Curiati
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 04/12694-8 - Incidência de demência e declínio cognitivo em idosos de baixa renda em São Paulo: estudo de coorte
• Beneficiário: Isabela Judith Martins Bensenor
• Modalidade de apoio: Auxílio à Pesquisa - Regular