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Cardiopulmonary baroreflexes: left ventricular effects

T C Lloyd

    The American Journal of Physiology
    |June 11, 1977
    PubMed
    Summary
    This summary is machine-generated.

    The ventricular baroreflex is less sensitive than other reflexes, responding to higher pressures. Left atrial and pulmonary vein reflexes are more sensitive to filling pressure changes.

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    Area of Science:

    • Cardiovascular Physiology
    • Baroreceptor Reflexes

    Background:

    • The baroreflex is a critical mechanism for regulating blood pressure.
    • Understanding the specific roles of different cardiac chambers in baroreflex activation is essential.

    Purpose of the Study:

    • To investigate the sensitivity and threshold of left ventricular baroreflexes.
    • To compare ventricular baroreflexes with reflexes originating from the left atrium and pulmonary veins.

    Main Methods:

    • Systemic vascular resistance in dogs was measured using a pump oxygenator system.
    • Pressure changes were imposed on both beating and fibrillating ventricles to assess baroreflex responses.
    • Left atrial and ventricular pressures were monitored.

    Main Results:

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    • Left ventricular baroreflexes showed a significantly lower sensitivity and higher threshold compared to other vasodepressor reflexes.
    • Ventricular baroreflexes were initiated by systolic pressures in the 100-150 mmHg range, not diastolic pressures (10-20 mmHg).
    • Reflexes from the left atrium and pulmonary veins responded to changes in ventricular filling pressure with higher sensitivity.

    Conclusions:

    • The left ventricle is a less sensitive baroreceptor site compared to the left atrium and pulmonary veins.
    • Ventricular baroreflexes are primarily influenced by systolic wall tension, requiring higher pressures for activation.
    • Atrial and pulmonary venous reflexes play a more significant role in regulating cardiac filling pressures.