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Related Experiment Videos

Renal acidification in elderly subjects

B N Agarwal, F G Cabebe

    Nephron
    |January 1, 1980
    PubMed
    Summary

    Elderly individuals show a reduced capacity to excrete acid loads, primarily due to diminished ammonium excretion by the kidneys, independent of kidney function. This impacts renal acidification in older adults.

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    Area of Science:

    • Nephrology
    • Gerontology
    • Physiology

    Background:

    • Renal acidification is crucial for maintaining acid-base balance.
    • Age-related changes in kidney function may affect acid excretion.
    • Understanding these changes is important for geriatric health.

    Purpose of the Study:

    • To investigate renal acidification capacity in healthy elderly subjects.
    • To compare acid excretion in elderly versus younger individuals.
    • To identify age-related alterations in renal acid handling.

    Main Methods:

    • Utilized a short ammonium chloride loading test.
    • Measured urinary pH, net acid excretion, and ammonium excretion.
    • Corrected ammonium excretion for glomerular filtration rate (GFR).

    Main Results:

    • Elderly subjects exhibited reduced net acid excretion and lower urinary pH post-load.
    • Ammonium excretion was significantly lower in the elderly, independent of GFR.
    • An inverse correlation between urinary pH and ammonium excretion was noted in younger, but not elderly, subjects.

    Conclusions:

    • Renal capacity to excrete acid loads diminishes with age.
    • Reduced ammonium excretion is the primary cause of impaired renal acidification in the elderly.
    • A subtle pH gradient defect may be present in older individuals.

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