Stroke, Vol 17, 1220-1228, Copyright © 1986 by American Heart Association
T Yamaguchi, I Kanno, K Uemura, F Shishido, A Inugami, T Ogawa, M Murakami and K Suzuki
To investigate changes in cerebral circulation and oxygen metabolism during
aging, regional cerebral blood flow (rCBF), regional oxygen extraction
fraction (rOEF), regional cerebral metabolic rate of oxygen (rCMRO2) and
regional cerebral blood volume (rCBV) were measured using the 15O labelled
gas inhalation technique and a multi-slice positron emission tomograph
(PET) in 22 healthy volunteers, aged from 26 to 64 years old. The
measurements were performed with subjects at rest, without sensory
deprivation. The values of rCBF, rOEF, rCMRO2 and rCBV in more than 40
anatomical structures of the brain were evaluated by studying a large
series of scans in each region of interest after the functional PET image
had been anatomically identified using x-ray computed tomographic images
corresponding to the PET. In mean gray values, only CMRO2 showed
significant reduction with age. rCMRO2 significantly decreased with age
only in the supratentrium, and much more in the left hemisphere. Especially
remarkable was rCMRO2 reduction in the left caudate region. Both CBF and
OEF were variable and less age- dependent. It was concluded that CMRO2
could be reflecting healthy brain aging most properly.
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Reduction in regional cerebral metabolic rate of oxygen during human aging
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