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Renal function in experimental chronic hydronephrosis. I. Backflow studies with dextran.

L Bäcklund, O Grimås, G Grotte

    Scandinavian Journal of Urology and Nephrology
    |January 1, 1975
    PubMed
    Summary
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    Unilateral hydronephrosis in dogs reduced renal function. Lymphatic transport of dextran and ions showed minimal changes despite increased intrapelvic pressure, indicating limited compensatory mechanisms.

    Area of Science:

    • Nephrology
    • Urology
    • Renal Physiology

    Background:

    • Hydronephrosis, often caused by ureteral stenosis, significantly impacts renal function.
    • Understanding the compensatory mechanisms and fluid dynamics in hydronephrosis is crucial for clinical management.

    Purpose of the Study:

    • To investigate the effects of unilateral hydronephrosis on renal function in a canine model.
    • To evaluate pyelovenous and pyelolymphatic reflux, and the transport of ions and dextran under varying intrapelvic pressures.

    Main Methods:

    • Unilateral hydronephrosis was induced in 10 dogs via ureteral ligation.
    • Renal function tests (creatinine clearance, osmolality) were performed pre- and post-ligation.
    • Dextran deposition, pyelovenous/pyelolymphatic reflux, and ion/dextran levels in lymph, blood, and urine were analyzed.

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    Main Results:

    • A reduction in overall renal function was observed in dogs with hydronephrosis.
    • Minimal transport of dextran via lymphatic and blood systems was noted.
    • Elevated intrapelvic pressure did not significantly increase lymphatic transport of sodium, potassium, or chloride.

    Conclusions:

    • Induced hydronephrosis impairs canine renal function.
    • The lymphatic system shows limited capacity for transporting dextran and ions in this model.
    • Increased intrapelvic pressure does not enhance lymphatic ion transport, suggesting restricted compensatory pathways.