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Related Experiment Videos

Carotid baroreflexes during hemodialysis.

B Wehle, S Bevegård, J Castenfors

    Clinical Nephrology
    |May 1, 1983
    PubMed
    Summary

    This study on hemodialysis patients found that while dialysis can lower blood pressure, the carotid baroreceptor reflex remains functional. The blood pressure decrease is not due to impaired baroreceptor control, suggesting other mechanisms at play.

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    Area of Science:

    • Nephrology
    • Cardiovascular Physiology
    • Baroreceptor Reflex

    Background:

    • Hemodialysis patients often experience blood pressure fluctuations.
    • The carotid baroreceptor reflex plays a crucial role in blood pressure regulation.
    • Understanding baroreceptor function during hemodialysis is essential for patient management.

    Purpose of the Study:

    • To investigate the carotid baroreceptor reflex in hemodialysis patients.
    • To assess baroreceptor function under different dialysis conditions (predialysis and during dialysis with varying sodium concentrations).
    • To determine if impaired baroreceptor control contributes to blood pressure decrease during hemodialysis.

    Main Methods:

    • Studied 9 regular hemodialysis patients.
    • Utilized standardized carotid sinus stimulation via neck suction.

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  • Measured blood pressure and heart rate responses during predialysis (recirculation) and during hemodialysis (120-266 minutes) with dialysate sodium at 145 and 133 mmol/l.
  • Assessed plasma renin activity.

    • Main Results:

    • Dialysis, regardless of sodium concentration, tended to decrease blood pressure.
    • Heart rate and plasma renin activity significantly increased during dialysis.
    • Carotid sinus stimulation decreased systolic pressure similarly to healthy subjects during recirculation.
    • The blood pressure response to neck suction was enhanced during dialysis, indicating preserved baroreceptor sensitivity.
    • Heart rate was not influenced by neck suction, suggesting potential vagal neuropathy in uremic patients.

    Conclusions:

    • The blood pressure decrease observed during hemodialysis is unlikely due to defective carotid sinus baroreceptor control.
    • Hemodialysis patients maintain a functional carotid baroreceptor reflex, with enhanced blood pressure responses during dialysis.
    • Potential vagal neuropathy in uremic patients may affect heart rate responses to baroreceptor stimulation.