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Effect of renal decapsulation on renal function.

L A Hebert, K A Stuart, J A Stemper

    The American Journal of Physiology
    |September 1, 1975
    PubMed
    Summary
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    Increased kidney compliance, observed in acute kidney injury, impairs renal function under elevated pressure. Decapsulating kidneys reduced filtration and excretion, suggesting swelling impacts kidney performance.

    Area of Science:

    • Nephrology
    • Renal Physiology
    • Surgical Research

    Background:

    • Acute renal injury, such as acute tubular necrosis and transplant rejection, is often associated with significant renal swelling.
    • Previous studies in dogs suggested that increased kidney compliance, leading to swelling, is a primary factor in acute renal injury.
    • The current study aimed to investigate the functional consequences of compliance-mediated renal volume increases.

    Purpose of the Study:

    • To assess whether compliance-mediated increases in renal volume affect renal function.
    • To compare the function of decapsulated kidneys (DK) versus intact kidneys (IK) under varying intrarenal pressures.
    • To evaluate the impact of partial decapsulation on renal function compared to intact kidneys.

    Main Methods:

    Related Experiment Videos

  • Compared renal function between decapsulated kidneys (DK) and intact kidneys (IK) in 15 dogs.
  • Compared renal function between partially decapsulated kidneys (PDK) and intact kidneys (IK) in 12 dogs.
  • Assessed glomerular filtration rate (GFR), sodium (Na), and water (H2O) excretion under control (ureteral pressure [UP] = 0 mmHg), increased (UP = 30 mmHg), and recovery (UP = 0 mmHg) conditions.

    • Main Results:

    • Under increased intrarenal pressure, decapsulated kidneys showed a ~20% reduction in GFR and a ~30% reduction in Na and H2O excretion compared to intact kidneys.
    • Renal function was equal between decapsulated and intact kidneys under control and recovery conditions (UP = 0 mmHg).
    • The observed functional impairment in decapsulated kidneys correlated with greater volume expansion (~21%) compared to intact kidneys (~10%) at increased intrarenal pressure.

    Conclusions:

    • Compliance-mediated renal swelling, induced by decapsulation, impairs renal function, specifically GFR and solute/water excretion, under elevated intrarenal pressure.
    • The findings suggest that increased kidney compliance contributes to functional deficits during acute renal injury.
    • The mechanism of functional impairment is likely related to the kidney's increased expansion rather than altered blood flow or fluid leakage.