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Related Experiment Videos

Plasma electrolytes in elderly patients taking fixed combination diuretics.

A J Bayer, R Farag, S Browne

    Postgraduate Medical Journal
    |March 1, 1986
    PubMed
    Summary

    Fixed-dose combination diuretics, often used for elderly patients, did not effectively prevent low potassium levels (hypokalemia). The amiloride-hydrochlorothiazide combination also led to a higher incidence of low sodium levels (hyponatremia).

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    Area of Science:

    • Geriatric Medicine
    • Pharmacology
    • Nephrology

    Background:

    • Thiazide diuretics are commonly prescribed for elderly patients.
    • Electrolyte imbalances, such as hypokalemia and hyponatremia, are potential side effects of diuretic therapy.
    • Fixed-dose combination diuretics are widely used to simplify medication regimens.

    Purpose of the Study:

    • To evaluate the efficacy of fixed-dose combination diuretics in preventing hypokalemia in elderly patients.
    • To assess the incidence of hyponatremia associated with specific combination diuretics.
    • To question the widespread use of fixed-dose combination diuretics compared to single agents.

    Main Methods:

    • Plasma potassium and sodium concentrations were measured.
    • Elderly patients on maintenance diuretic therapy were studied.

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  • Patients received thiazide alone, thiazide with potassium supplement, or a fixed-dose combination diuretic.

    • Main Results:

    • Fixed-dose combinations of thiazide and potassium-sparing diuretics did not significantly reduce hypokalemia prevalence.
    • The amiloride-hydrochlorothiazide combination was linked to a disproportionately high number of hyponatremia cases.
    • No significant difference in hypokalemia was observed between thiazide alone and thiazide plus potassium supplement.

    Conclusions:

    • Fixed-dose combination diuretics may not be superior to single agents for preventing hypokalemia in the elderly.
    • The amiloride-hydrochlorothiazide combination poses a risk for hyponatremia.
    • The cost-effectiveness and clinical benefit of widespread fixed-dose combination diuretic use warrant reconsideration.