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Observations on lithium disposition in the elderly

D J Chapron, I R Cameron, L B White

    Journal of the American Geriatrics Society
    |October 1, 1982
    PubMed
    Summary
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    Elderly women showed altered lithium disposition kinetics, with prolonged plasma half-lives and reduced renal clearance. These findings suggest age-related changes in how the body processes lithium.

    Area of Science:

    • Pharmacokinetics and Geriatric Medicine

    Background:

    • Lithium is a common mood stabilizer, particularly for bipolar disorder.
    • Understanding lithium's disposition in elderly populations is crucial due to potential age-related physiological changes.

    Purpose of the Study:

    • To investigate the disposition kinetics of lithium in elderly women.
    • To compare lithium half-life, renal clearance, and distribution volume in aged individuals with existing data.

    Main Methods:

    • Studied six elderly women on long-term lithium therapy.
    • Abruptly discontinued lithium administration.
    • Measured plasma, whole blood, and erythrocyte lithium half-lives.
    • Assessed renal plasma clearance and distribution volume.

    Main Results:

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    • Whole blood and erythrocyte lithium half-lives were similar.
    • Plasma lithium half-life was comparable to younger schizophrenic patients but prolonged versus young normal volunteers.
    • Renal plasma clearance and distribution volume were significantly reduced compared to published values.

    Conclusions:

    • Lithium disposition kinetics appear altered in the elderly.
    • Age-related changes may affect lithium metabolism and excretion.
    • Further research is warranted to optimize lithium dosing in geriatric patients.