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Interactions between volume expansion or diuretics and compensatory adaptation

Y Arslan, J Diezi, G Peters

    The American Journal of Physiology
    |December 1, 1978
    PubMed
    Summary
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    Unilateral nephrectomy (1/2Nex) in rats increases water and sodium excretion proportionally, with diuretic effects being additive. This compensatory adaptation suggests different sites of action for nephrectomy and diuretic agents.

    Area of Science:

    • Nephrology
    • Renal Physiology
    • Pharmacology

    Background:

    • Unilateral nephrectomy (1/2Nex) in rats leads to compensatory renal adaptation.
    • Understanding the interplay between compensatory adaptation and diuretic agents is crucial for renal function studies.

    Purpose of the Study:

    • To investigate the additive effects of unilateral nephrectomy (1/2Nex) and diuretic agents on renal function.
    • To explore the impact of compensatory adaptation on the efficacy of diuretics and volume expansion.

    Main Methods:

    • Unanesthetized rats underwent unilateral nephrectomy (1/2Nex) or sham operation.
    • Rats were infused with saline and administered acetazolamide or furosemide.
    • Glomerular filtration rate, urine flow, and Na excretion were measured.

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    Main Results:

    • Unilateral nephrectomy (1/2Nex) reduced glomerular filtration rate by 50% but increased fractional excretion of water and Na by 1.5- to 2.2-fold.
    • Diuretic effects of volume expansion, acetazolamide, furosemide, and contralateral nephrectomy were additive.
    • Compensatory adaptation proportionally increased subsequent diuretic effects, with reduced urinary furosemide excretion post-IV injection in 1/2Nex rats.

    Conclusions:

    • The additive diuretic effects suggest distinct sites of action for compensatory adaptation and exogenous diuretic agents.
    • Compensatory adaptation in response to unilateral nephrectomy (1/2Nex) enhances the response to volume expansion and diuretics.