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Changes in aortic bifurcation geometry during a cardiac cycle.

R A Meyer, J D Mandell, M H Friedman

    Journal of Biomechanics
    |January 1, 1984
    PubMed
    Summary
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    Rabbit aortic bifurcation experiences significant radial strain during the cardiac cycle, altering its shape. This in vivo study reveals how the aortic bifurcation geometry changes dynamically with blood pressure pulses.

    Area of Science:

    • Cardiovascular physiology
    • Biomedical engineering
    • Aortic mechanics

    Background:

    • The aortic bifurcation is a critical site for cardiovascular disease.
    • Understanding the mechanical behavior of the aortic bifurcation is essential for diagnosing and treating vascular conditions.
    • Previous studies have primarily focused on computational models or ex vivo experiments.

    Purpose of the Study:

    • To quantify in vivo radial strain at the rabbit aortic bifurcation during the cardiac cycle.
    • To investigate the dynamic changes in the cross-sectional geometry of the aortic bifurcation.
    • To correlate mechanical strain with geometric alterations in a physiological setting.

    Main Methods:

    • In vivo measurements of radial strain were performed on rabbits.

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  • Measurements were taken at the aortic bifurcation using specialized techniques.
  • Data acquisition occurred at various time points throughout the cardiac cycle.

    • Main Results:

    • Radial strain exhibited distinct patterns in different planes at the bifurcation.
    • Positive radial strain was observed in the plane perpendicular to the bifurcation.
    • Negative radial strain was measured in the plane of the bifurcation at peak pressure.
    • The aortic bifurcation's cross-sectional shape shifted from elliptical during diastole to more circular during systole.

    Conclusions:

    • The aortic bifurcation undergoes significant, direction-dependent radial strain during the cardiac cycle.
    • These dynamic geometric changes are driven by pressure pulses.
    • The findings provide crucial in vivo data on the mechanical behavior of a key vascular junction.