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Hemodynamic changes during sequential ultrafiltration and dialysis.

B Wehle, H Asaba, J Castenfors

    Kidney International
    |April 1, 1979
    PubMed
    Summary
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    Hemodynamic changes during dialysis and ultrafiltration reveal that ultrafiltration decreases cardiac output, while dialysis causes vasodilation. These findings are crucial for understanding cardiovascular adjustments in dialysis patients.

    Area of Science:

    • Nephrology
    • Cardiovascular Physiology
    • Internal Medicine

    Background:

    • Patients undergoing regular dialysis experience significant hemodynamic shifts.
    • Understanding these changes is vital for managing cardiovascular complications in end-stage renal disease.

    Purpose of the Study:

    • To investigate the sequential hemodynamic alterations during ultrafiltration and dialysis.
    • To differentiate the cardiovascular responses to ultrafiltration versus dialysis itself.

    Main Methods:

    • Studied seven patients on regular dialysis.
    • Measured cardiac index, heart rate, stroke volume index, blood pressure, and total peripheral vascular resistance.
    • Utilized sequential ultrafiltration (1 hour) and dialysis (3 hours), with ultrafiltration prevented during dialysis.

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    Main Results:

    • Ultrafiltration led to decreased cardiac index and stroke volume index, with increased total peripheral vascular resistance and stable blood pressure.
    • Dialysis resulted in decreased total peripheral vascular resistance, increased cardiac index and heart rate, and a potential drop in blood pressure.
    • Plasma renin activity (PRA) increased during ultrafiltration and decreased during dialysis.

    Conclusions:

    • Ultrafiltration induces hypovolemia and reduces cardiac output.
    • Dialysis causes vasodilation, potentially linked to reduced sympathetic activity, which can lower blood pressure.
    • These distinct hemodynamic responses highlight the complex cardiovascular adjustments during renal replacement therapy.