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The dynamic aortic root. Its role in aortic valve function

R J Brewer, J D Deck, B Capati

    The Journal of Thoracic and Cardiovascular Surgery
    |September 1, 1976
    PubMed
    Summary
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    The aortic root diameter changes by 16% each cardiac cycle, explaining aortic valve function without leaflet shortening. This dynamic aortic root may enhance leaflet longevity by reducing fatigue stress.

    Area of Science:

    • Cardiovascular Physiology
    • Biomechanical Engineering
    • Cardiac Anatomy

    Background:

    • The precise mechanism of aortic valve function remains a subject of research.
    • Understanding the role of the aortic root in valve dynamics is crucial for cardiac health.

    Purpose of the Study:

    • To investigate the dimensional changes of the aortic root during the cardiac cycle.
    • To determine if aortic root dynamics can explain aortic valve function.
    • To explore the implications of aortic root dynamics on aortic leaflet longevity.

    Main Methods:

    • Utilized measuring devices attached to the intact aortic root wall at the leaflet coaptation level.
    • Quantified diameter changes during each cardiac cycle.

    Main Results:

    Related Experiment Videos

    • Measured a significant 16% diameter change in the aortic root per cardiac cycle.
    • Observed dimensional changes that adequately explain aortic valve function.
    • Found tissue composition compatible with a dynamic aortic root theory.

    Conclusions:

    • Aortic valve function can be explained by dynamic changes in aortic root dimensions.
    • The theory obviates the need for postulating leaflet shortening and lengthening.
    • Dynamic aortic root behavior likely contributes to aortic leaflet longevity by minimizing fatigue stress.