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Related Experiment Videos

Computational fluid dynamics of left ventricular ejection.

J G Georgiadis1, M Wang, A Pasipoularides

  • 1Department of Mechanical Engineering, School of Engineering, Duke University Medical Center, Durham, NC.

Annals of Biomedical Engineering
|January 1, 1992
PubMed
Summary

Higher left ventricular eccentricity requires greater ejection pressure gradients, impacting blood flow dynamics. Computational fluid dynamics reveal geometric variations significantly influence intraventricular ejection.

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Area of Science:

  • Cardiovascular Physiology
  • Computational Fluid Dynamics
  • Biomedical Engineering

Background:

  • Intraventricular ejection dynamics are crucial for cardiac function.
  • Numerical simulations are increasingly used to model complex physiological processes.
  • Incorporating realistic geometric variations is essential for accurate simulations.

Purpose of the Study:

  • To investigate the impact of geometric variations on left ventricular ejection dynamics.
  • To analyze the effects of chamber eccentricity and outflow orifice size on ejection gradients.
  • To advance numerical simulations of cardiac ejection.

Main Methods:

  • Utilized computational fluid dynamics (CFD) for simulation.
  • Employed an alternating-direction-implicit (ADI) algorithm on adaptive grids.

Related Experiment Videos

  • Discretized and iteratively solved the equation of motion for streamfunction.

    • Main Results:

    • Increased chamber eccentricity necessitates higher ejection pressure gradients for equivalent flow.
    • Local acceleration effects at the aortic annulus intensify with higher eccentricity.
    • Outflow orifice stenosis primarily intensifies convective acceleration effects.

    Conclusions:

    • Left ventricular geometry significantly influences ejection pressure gradients.
    • Chamber eccentricity is a key factor in determining pressure gradients during ejection.
    • CFD models provide valuable insights into cardiac fluid dynamics.