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Blood pressure and renal function

S Ljungman, M Aurell, M Hartford

    Acta Medica Scandinavica
    |January 1, 1980
    PubMed
    Summary
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    This study reveals that increasing blood pressure (BP) gradually alters renal hemodynamics, decreasing renal blood flow but maintaining glomerular filtration rate (GFR) through autoregulation in 49-year-old men.

    Area of Science:

    • Nephrology
    • Cardiovascular Medicine
    • Physiology

    Background:

    • Essential hypertension is a prevalent condition affecting renal function.
    • Understanding the early impact of blood pressure on kidney hemodynamics is crucial for disease management.
    • Previous studies have not fully elucidated the autoregulatory capacity of the kidneys across a spectrum of blood pressure levels.

    Purpose of the Study:

    • To investigate the relationship between blood pressure and various parameters of renal function.
    • To assess the impact of increasing blood pressure on renal blood flow (RBF), renovascular resistance (RVR), glomerular filtration rate (GFR), and filtration fraction (FF).
    • To determine if glomerular filtration rate (GFR) is autoregulated across different blood pressure levels in men not on antihypertensive treatment.

    Main Methods:

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    • A cohort of 3,205 49-year-old men underwent blood pressure screening.
    • 120 subjects were systematically selected based on diastolic blood pressure levels, excluding those on antihypertensive medication.
    • Renal blood flow (RBF), renovascular resistance (RVR), glomerular filtration rate (GFR), filtration fraction (FF), and renal concentrating capacity were measured in 111 participants.

    Main Results:

    • Increasing blood pressure correlated with a decrease in renal blood flow (RBF) (r = -0.34) and an increase in renovascular resistance (RVR) (r = 0.81) and filtration fraction (FF) (r = 0.35).
    • These hemodynamic changes occurred gradually across the spectrum of blood pressure, without a specific threshold.
    • Glomerular filtration rate (GFR) remained unchanged with increasing blood pressure, indicating autoregulation.
    • Renal concentrating capacity was also unaffected by blood pressure levels.

    Conclusions:

    • Renal hemodynamics in essential hypertension are primarily adjusted to maintain a constant glomerular filtration rate (GFR).
    • Autoregulation of GFR is effective across a wide range of blood pressure levels studied.
    • These findings highlight the kidney's compensatory mechanisms in response to elevated blood pressure, even in the early stages.