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Contralateral renal function following unilateral renal artery constriction.

R D Murray, E Hackenthal, U Mittmann

    Renal Physiology
    |January 1, 1982
    PubMed
    Summary

    Unilateral renal artery constriction acutely increased contralateral kidney vascular resistance and sodium excretion. Glomerular filtration rate and blood flow remained unchanged, while renin secretion decreased significantly.

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    Area of Science:

    • Nephrology
    • Renal Physiology
    • Cardiovascular Research

    Background:

    • Unilateral renal artery constriction is a model for studying renal autoregulation and hormonal responses.
    • Understanding the contralateral kidney's acute response is crucial for managing renovascular hypertension.

    Purpose of the Study:

    • To investigate the acute physiological and hormonal adaptations of the contralateral kidney to unilateral renal artery constriction in a canine model.

    Main Methods:

    • Seven pentobarbital-anesthetized dogs underwent unilateral renal artery constriction to approximately 60 mm Hg.
    • Measurements included contralateral renal vascular resistance, sodium excretion, filtration fraction, glomerular filtration rate, blood flow, plasma flow, and renin secretion.

    Main Results:

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    • Within 30 minutes, contralateral vascular resistance, sodium excretion, and filtration fraction significantly increased.
    • Glomerular filtration rate, blood flow, and plasma flow showed no significant changes.
    • Renin secretion decreased dramatically, with some dogs exhibiting negative net renin release.

    Conclusions:

    • The acute contralateral kidney response involves increased vascular resistance and sodium excretion, without changes in filtration or flow.
    • This acute response differs from previously observed chronic adaptations.
    • The findings highlight the complex immediate regulatory mechanisms in the contralateral kidney during unilateral renal artery constriction.