Amyloid deposition in semantic dementia: a positron emission tomography study.
Int J Geriatr Psychiatry
; 31(9): 1064-74, 2016 09.
Article
em En
| MEDLINE
| ID: mdl-26807731
ABSTRACT
BACKGROUND:
Pittsburgh compound B ([11C]-PIB) identifies amyloid-ß (Aß) deposition in vivo. Asymptomatic Aß deposition has been reported consistently in some healthy older subjects. Of patients with frontotemporal dementia, those who have later onset have a higher potential for Aß deposition.OBJECTIVE:
Comparison of Aß deposition in Alzheimer's disease (AD), healthy older controls, and patients with early- and late-onset semantic dementia (SD), a subtype of frontotemporal dementia.METHODS:
Subjects were recruited from tertiary academic care centers specializing in assessment and management of patients with neurodegenerative disease. We used the radiotracer [11C]-PIB in a high-resolution positron emission tomography scanner to evaluate 11 participants with SD (six with onset before age 65 and five with later onset), 9 with probable AD, and 10 controls over age 60. The main outcome measures were frontal, temporal, parietal, and total [11C]-PIB standardized uptake value ratios to establish PIB-positive (PIB+) cutoff.RESULTS:
The five patients with late-onset SD were PIB-negative. Two of six with early-onset SD, seven of nine with AD, and 1 of 10 controls were PIB+. The SD participants who were PIB+ did not have memory or visuospatial deficits that are typical in AD.CONCLUSIONS:
Aß deposition does not seem to be associated with late-onset SD. Future larger studies might confirm whether a significant minority of early-onset SD patients exhibit Aß deposition. Copyright © 2016 John Wiley & Sons, Ltd.Palavras-chave
Texto completo:
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Córtex Cerebral
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Peptídeos beta-Amiloides
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Demência Frontotemporal
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Doença de Alzheimer
Tipo de estudo:
Observational_studies
/
Risk_factors_studies
Limite:
Aged
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article