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Atrial reflexes and renal function.

R J Linden

    The American Journal of Cardiology
    |October 22, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Stimulating atrial receptors with small balloons increases heart rate and urine production. This reflex involves myelinated vagal fibers, affecting kidney nerves and releasing a blood-borne agent.

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    Area of Science:

    • Cardiovascular Physiology
    • Renal Physiology
    • Neuroendocrinology

    Background:

    • Atrial receptors play a role in regulating cardiovascular and renal functions.
    • Two types of atrial receptors, discharging into myelinated and nonmyelinated fibers, have been identified.

    Purpose of the Study:

    • To investigate the role of atrial receptors in mediating reflex cardiovascular and urinary responses.
    • To elucidate the specific pathways involved in these reflexes.

    Main Methods:

    • Distension of venous-atrial junctions using small balloons in experimental models.
    • Recording of physiological responses including heart rate, urinary flow, and sodium excretion.
    • Analysis of neural and hormonal pathways involved in the efferent response.

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    Main Results:

    • Distension triggered a reflex increase in heart rate, mediated by sympathetic nerves.
    • Atrial receptor stimulation led to increased urinary flow and sodium excretion.
    • The diuretic response involved both neural (reduced renal nerve activity) and hormonal (blood-borne agent) components.

    Conclusions:

    • Myelinated vagal fibers are crucial for mediating the reflex increase in heart rate and urinary flow.
    • The efferent pathway for diuresis is complex, involving nervous and hormonal mechanisms.
    • Atrial receptors contribute to fluid and electrolyte balance through distinct neural and humoral pathways.