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Intrarenal hemodynamics and renal function in postobstructive uropathy.

C H Hsu, T W Kurtz, J Rosenzweig

    Investigative Urology
    |January 1, 1978
    PubMed
    Summary
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    Following ureteral obstruction release, bilateral obstruction caused significant sodium excretion, while unilateral obstruction did not. Both led to reduced kidney function, primarily due to preglomerular vasoconstriction.

    Area of Science:

    • Nephrology
    • Urology
    • Physiology

    Background:

    • Ureteral obstruction impairs renal function.
    • The impact of obstruction release on renal hemodynamics and sodium excretion requires further investigation.

    Purpose of the Study:

    • To investigate the effects of releasing unilateral (UUO) and bilateral (BUO) ureteral obstruction on renal function, sodium excretion, and renal blood flow.
    • To determine the underlying mechanisms of altered renal hemodynamics post-obstruction release.

    Main Methods:

    • Induction of 24-hour UUO and BUO in rats.
    • Measurement of fractional sodium excretion and renal blood flow post-obstruction release.
    • Assessment of intrarenal blood flow distribution and filtration fraction.

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    Main Results:

    • BUO rats exhibited massive natriuresis after obstruction release, unlike UUO rats.
    • Renal blood flow was reduced in BUO rats (60% of control) and the obstructed kidney in UUO rats (78% of contralateral kidney).
    • Reduced filtration fractions in both UUO and BUO rats suggest preglomerular vasoconstriction as the primary cause of decreased glomerular filtration rate.

    Conclusions:

    • The pattern of sodium excretion differs significantly between BUO and UUO after obstruction release.
    • Preglomerular vasoconstriction plays a key role in the functional impairment of kidneys following ureteral obstruction release.