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[Ventricular volume and coronary flow].

P Pagliaro1, P Vono

  • 1Dipartimento di Anatomia e Fisiologia Umana, Università degli Studi, Torino.

Cardiologia (Rome, Italy)
|August 1, 1991
PubMed
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Ventricular volume changes influence coronary flow (CF) primarily through myocardial contractility, not left ventricular pressure (LVP). Extreme dilation reduces diastolic CF, while systolic CF reduction correlates with contractility, independent of LVP.

Area of Science:

  • Cardiovascular Physiology
  • Cardiac Mechanics
  • Coronary Circulation

Background:

  • Understanding coronary flow (CF) regulation is crucial for cardiovascular health.
  • Autoregulation mechanisms typically maintain CF despite pressure changes.
  • This study investigates CF determinants excluding autoregulation.

Purpose of the Study:

  • To investigate the roles of ventricular volume (VV), left ventricular pressure (LVP), and myocardial contractility in altering coronary flow (CF).
  • To examine these relationships in the absence of autoregulation.
  • To differentiate the effects of LVP and contractility on CF.

Main Methods:

  • Utilized extracorporeal circulation in 5 anesthetized dogs with a heart-lung machine.
  • Manipulated left ventricular volume (VV) in 10 ml increments (10-70 ml) using an intraventricular balloon.

Related Experiment Videos

  • Suppressed autoregulation via complete coronary vasodilation induced by dipyridamole.

    • Main Results:

    • Increased VV led to increased diastolic LVP and myocardial pressure development, initially increasing systolic LVP.
    • At maximal VV (60-70 ml), myocardial pressure development decreased.
    • Diastolic CF decreased only at 60-70 ml VV, independent of diastolic LVP.
    • Systolic CF reduction correlated linearly with myocardial pressure development.
    • During VV reduction, systolic LVP and CF reduction were lower than during inflation, correlating with reduced contractility.

    Conclusions:

    • Left ventricular pressure does not directly influence phasic coronary flow.
    • Diastolic coronary flow reduction occurs only with extreme ventricular dilation.
    • Systolic coronary flow reduction is dependent on myocardial contractility, not intraventricular pressure levels.