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Circulating plasma volume and renal function.

Y Sasaki, T Furuyama, R Shioji

    The Tohoku Journal of Experimental Medicine
    |August 1, 1975
    PubMed
    Summary
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    Glomerular filtration rate (GFR) changes are directly related to plasma volume (PV) changes, not mean arterial pressure, in both healthy individuals and those with chronic kidney disease. This power function relationship suggests PV is a key regulator of renal function.

    Area of Science:

    • Nephrology
    • Physiology
    • Cardiovascular Research

    Background:

    • Circulating plasma volume (PV) influences renal function, including glomerular filtration rate (GFR) and effective renal plasma flow.
    • Understanding these relationships is crucial, especially in conditions like chronic glomerulonephritis.

    Purpose of the Study:

    • To investigate the relationship between plasma volume and GFR/effective renal plasma flow.
    • To examine how upright posture affects these parameters in healthy subjects and patients with chronic glomerulonephritis.

    Main Methods:

    • Investigated changes in GFR and effective renal plasma flow in response to changes in PV induced by upright posture.
    • Compared these relationships in normal subjects and patients with chronic glomerulonephritis.
    • Analyzed the correlation between changes in mean arterial pressure and GFR.

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    Main Results:

    • A consistent power function relationship was observed between percentage changes in GFR and percentage changes in PV (GFR = k * PV), with no significant difference between normal subjects (k=3.4) and patients (k=3.1).
    • Effective renal plasma flow changes showed a biphasic relationship with PV.
    • Changes in mean arterial pressure did not correlate with GFR changes.

    Conclusions:

    • GFR is regulated by a power function of plasma volume, particularly during decreases in PV, rather than by mean arterial pressure.
    • The findings highlight the critical role of plasma volume in maintaining renal function.
    • Potential mechanisms involving the renal arterial system structure are considered.