Differences in hippocampal metabolism between amnestic and non-amnestic MCI subjects: automated FDG-PET image analysis.
Q J Nucl Med Mol Imaging
; 53(6): 646-57, 2009 Dec.
Article
en En
| MEDLINE
| ID: mdl-20016455
ABSTRACT
AIM:
The aim of this study was to assess whether 18F-fluorodeoxyglucose positron emission tomography differentiates amnestic (aMCI) from single-non-amnestic mild cognitive impairment (snaMCI) with executive dysfunction.METHODS:
Sixteen aMCI subjects (62% females, age 75+/-8 years) and 14 snaMCI subjects (71% females, age 74+/-6 years) underwent [18F]FDG-PET and clinical follow-up. Comparisons between MCI subgroups and with seven cognitively normal elderly subjects were performed using SPM2.RESULTS:
At baseline aMCI and snaMCI exhibited a similar pattern of hypometabolism, mostly in the posterior cingulate gyrus, as compared with controls. In the comparison between the MCI subtypes, the aMCI subjects showed reduced metabolism in the medial temporal lobes (MTL) (hippocampus, fusiform gyrus and amygdala). At follow-up 12 aMCI developed Alzheimer's disease (AD), while snaMCI had a heterogeneous course, including five subjects who developed Lewy body dementia.CONCLUSIONS:
The patterns of altered brain metabolism in aMCI and snaMCI subjects compared to controls are similar and do not provide evidence for making clinical distinctions between them. Comparison between the two MCI subtypes showed MTL hypometabolism in aMCI subjects, possibly reflecting the fact that most had prodromal AD.
Buscar en Google
Base de datos:
MEDLINE
Asunto principal:
Trastornos del Conocimiento
/
Fluorodesoxiglucosa F18
/
Tomografía de Emisión de Positrones
/
Amnesia
/
Hipocampo
Tipo de estudio:
Diagnostic_studies
Límite:
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Q J Nucl Med Mol Imaging
Asunto de la revista:
MEDICINA NUCLEAR
Año:
2009
Tipo del documento:
Article
País de afiliación:
Italia