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The first objective is to asses influence of age on amyloid load measured by PET imaging using Pittsburgh B compound (PiB) radio-tracer, in Alzheimer's disease(AD). This will allow the determination of brains age-specific deterioration factors by comparing Early onset AD (EOAD), Late onset AD (LOAD)and atypical focal cortical AD (PCA and LPA). The amount of brain lesions in AD patients is estimated by:
1. measuring the rate of cortical brain atrophy,
2. FDG imaging of glucose metabolism reflecting neuronal activity, and
3. for patients who benefited from a lumbar puncture; Cortical-spinal fluid (CSF) amounts of amyloïd and tau proteins are measured.
Literature data suggests there are different types of AD depending on their age of onset, called EOAD and LOAD. These two categories are distinguished by the localization of brain atrophy : severe and 'posterior' in EOAD and more 'anterior' in LOAD. Neuro-pathologic data suggests some atypical focal cortical atrophy, characterized by a respect of episodic memory, may be classified within EOAD.
PiB-based PET imaging allows the in-vivo visualization and quantification of amyloïd load.
We want to answer the question whether the amount of amyloïd protein may be lower in LOAD than EOAD in patients showing the same level of dementia, and thus identify ageing-specific cognitive disorders and understand witch factors influence etio-pathology of typical and atypical Alzheimer's disease.
Observational Model: Case Control, Time Perspective: Prospective
Pitie Salpêtrière Hospital
Ile de France
Institut National de la Santé Et de la Recherche Médicale, France
Published on BioPortfolio: 2014-08-27T03:14:53-0400
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