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Brain atrophy during aging: a quantitative study using computed tomography.

S Takeda, T Matsuzawa

    Journal of the American Geriatrics Society
    |July 1, 1984
    PubMed
    Summary
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    Brain atrophy, measured by cerebrospinal fluid (CSF) space volume, increases with age in both men and women after age 30. The rate of brain atrophy accelerates with aging, particularly in females.

    Area of Science:

    • Neuroscience
    • Radiology
    • Gerontology

    Background:

    • Brain atrophy is a natural part of aging.
    • Understanding age-related changes in brain volume is crucial for distinguishing normal aging from neurological disorders.

    Purpose of the Study:

    • To quantify age-related brain atrophy in a large cohort of males and females.
    • To investigate sex-specific differences in the rate and pattern of brain atrophy during aging.

    Main Methods:

    • Computed tomography (CT) scans were used to assess brain volume.
    • Cerebrospinal fluid (CSF) space volume and cranial cavity volume were measured.
    • A brain atrophy index (BAI) was calculated as (CSF space volume/cranial cavity volume) x 100%.

    Main Results:

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    • Both CSF space volume and BAI significantly increased after age 30 in both sexes (P < 0.001).
    • Brain atrophy accelerated constantly with age in females.
    • In men aged 30-50, the atrophy rate was initially more than double that of women, then declined.
    • CSF space volume and BAI increased exponentially with age after 30, continuing into the 80s.

    Conclusions:

    • Significant brain atrophy begins after age 30, with exponential progression into older age.
    • Distinct sex-specific patterns of brain atrophy exist, with females showing a constant acceleration and males exhibiting an initial rapid phase followed by a slower rate.