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Renal hemodynamics in hypertension.

S C Textor

    American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
    |July 1, 1987
    PubMed
    Summary

    Changes in kidney sodium handling due to blood pressure influence hypertension development. Kidney transplantation in hypertensive individuals normalizes blood pressure, highlighting the kidney's crucial role in blood pressure regulation.

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    Area of Science:

    • Nephrology
    • Cardiovascular Physiology
    • Hypertension Research

    Background:

    • The interplay between systemic arterial pressure, renal hemodynamics, and sodium balance is intricate.
    • Evidence suggests altered renal sodium handling in response to perfusion pressure changes contributes to hypertension pathogenesis.
    • Kidney transplantation success in hypertensive models underscores the kidney's central role.

    Purpose of the Study:

    • To explore the complex relationships between systemic hemodynamics and renal function in hypertension.
    • To investigate the role of renal sodium handling and vascular reactivity in the development and maintenance of hypertension.
    • To examine the impact of antihypertensive therapy on renal function.

    Main Methods:

    • Review of existing evidence on systemic arterial pressures, renal blood flow, and sodium homeostasis.
    • Analysis of studies on renal hemodynamics and vascular reactivity in hypertension.
    • Consideration of outcomes from kidney transplantation studies in hypertensive subjects.

    Main Results:

    • Renal blood flow inversely correlates with hypertension severity and duration.
    • Abnormal renal vascular reactivity may be an early indicator of essential hypertension.
    • Renal function can deteriorate during antihypertensive therapy, especially with preglomerular arterial disease, defining a 'critical perfusion pressure'.

    Conclusions:

    • Understanding how systemic hemodynamics affect renal function is key to managing hypertension.
    • Altered renal sodium handling and vascular reactivity are significant factors in hypertension.
    • Rational antihypertensive strategies should consider renal perfusion pressure and vascular status.

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