Aging Disorder Clinical Trial
Official title:
Impact of the Central Blood Pressure Level in Cerebral Metabolic Aging: a 18F-FDG PET Study.
Cerebral glycolytic metabolism can be quantified by quantitative analysis of 18F-Fluorodeoxyglucose (18F-FDG) Positron Emission Tomography (PET). This allows to identify neurological diseases at an early stage of functional abnormalities, before any anatomical lesions, and to differentiate them from the "normal" brain aging. Aging mainly leads to atrophy with a decrease in cerebral metabolism in the prefrontal cortex, with consequent deterioration of cognitive processes, in particular executive functions (5). In a population of 92 "control" subjects, investigators have already quantified the importance of the aging in frontal cortex hypometabolism. These patients were referred for a 18F-FDG PET in the follow-up of lymphoma considered to be in complete remission (PET without cerebral step), without any chemoradiotherapy within 2 months and with normal neuropsychological tests (Mini Mental State Examination, MMSE, Mini International Neuropsychiatric Interview MINI and Frontal Assessment Battery FAB). However, cerebral aging can be "accelerated" by vascular risk factors, including increased central blood pressure, as investigators have recently reported in a pilot study involving elderly patients. This central pressure, which is directly linked to the cerebral micro-vascularization, can be easily measured by applanation tonometry. In this pilot study, investigators showed that a central pulse pressure equal or greater than 50 mmHg was associated with a significant frontal hypometabolism in elderly patients. This confirmed, at a stage of pre-clinical remodeling, the worse prognostic significance for this criterion, as reported in large epidemiological studies (increased risk of stroke and cardiac vascular events). However, it is not yet known whether the level of central blood pressure interfere with the brain metabolism of younger subjects, especially with regard to aging observed throughout life. If this hypothesis is confirmed, preventive therapeutic strategies for accelerated aging, could thus integrate the monitoring of central pressure and cerebral metabolism. The objective of this study is to determine, in a population of control subjects and on a larger scale, the impact of central blood pressure on brain metabolic aging , by using 18F-FDG PET.
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