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Physiological and pathophysiological implications of ventricular/vascular coupling.

M F O'Rourke, T Yaginuma, A P Avolio

    Annals of Biomedical Engineering
    |January 1, 1984
    PubMed
    Summary
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    Ideal ventricular/vascular coupling optimizes heart function by minimizing pressure fluctuations. This efficient coupling, crucial for cardiovascular health, is less ideal in humans due to arterial degeneration.

    Area of Science:

    • Cardiovascular Physiology
    • Biomedical Engineering
    • Hemodynamics

    Background:

    • Ventricular/vascular coupling describes the interaction between the heart's pumping action and the arterial system's mechanical properties.
    • The arterial system, acting as a buffer, influences the transmission of pulsatile ventricular output to continuous flow in peripheral vessels.
    • Deviations from ideal coupling can impact cardiac efficiency and coronary blood flow.

    Purpose of the Study:

    • To define and characterize "ideal" ventricular/vascular coupling in both time and frequency domains.
    • To identify the physiological factors enabling ideal coupling and the mechanisms causing its disturbance.
    • To compare the degree of ventricular/vascular coupling in humans versus other mammals.

    Main Methods:

    Related Experiment Videos

  • Analysis of pressure and flow measurements in the ascending aorta (AA) and main pulmonary artery (MPA).
  • Assessment of ventricular/vascular coupling through time-domain (pressure fluctuation) and frequency-domain (impedance modulus and flow harmonics) analyses.
  • Identification of contributing factors including arterial distensibility, wave reflection, and heart rate-arterial parameters matching.

    • Main Results:

    • Ideal coupling is characterized by minimal pressure fluctuations in the AA and MPA.
    • In the frequency domain, ideal coupling shows a correspondence between minimal impedance modulus and maximal flow harmonics.
    • Factors promoting ideal coupling include proximal arterial distensibility, wave reflection, and a match between heart rate and arterial properties.
    • Ventricular/vascular coupling is near-ideal in large mammals but suboptimal in adult humans and some small mammals.

    Conclusions:

    • Optimal ventricular/vascular coupling is essential for efficient cardiac function and coronary perfusion.
    • Progressive arterial degeneration in humans, starting in childhood, leads to suboptimal coupling, characterized by dilated, tortuous arteries and high pulse pressure.
    • This mismatch contributes to an increased likelihood of ventricular failure in humans.