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A Rodent Model of The Ross Operation: Syngeneic Pulmonary Artery Graft Implantation in A Systemic Position
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Modeling study of aortic root for ross procedure: a structural finite element analysis.

Aike Qiao, Youlian Pan, Nianguo Dong

    The Journal of Heart Valve Disease
    |March 21, 2015
    PubMed
    Summary

    Geometric modifications to the aortic root in the Ross procedure can impact leaflet contact pressure. Altering sinotubular junction and sinus diameters influences neoaortic valve function and may explain long-term insufficiency.

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    Area of Science:

    • Cardiovascular Surgery
    • Biomechanical Engineering
    • Medical Device Design

    Background:

    • The Ross procedure utilizes a patient's pulmonary valve (autograft) as a neoaortic valve.
    • Reimplantation of coronary arteries and use of a homograft are key components.
    • Understanding neoaortic root mechanics is crucial for long-term valve performance.

    Purpose of the Study:

    • To model and simulate the biomechanical behavior of a neoaortic root.
    • To assess the impact of geometric variations on aortic leaflet performance.
    • To investigate factors contributing to neoaortic valve insufficiency after the Ross procedure.

    Main Methods:

    • Three-dimensional reconstruction of a reference aortic valve.
    • Creation of modified geometric models (B-E) with varied sinotubular junction (STJ) and sinus diameters.
    • Finite element analysis to simulate mechanical behavior and leaflet contact pressure.

    Main Results:

    • The neoaortic valve model demonstrated a maximum geometric orifice area (GOA) of 274.4 mm².
    • Increased STJ diameter (1.1-fold) in models B and D led to increased leaflet contact pressure (+27.4% and +3.04%).
    • Decreased STJ diameter (0.9-fold) in models C and E resulted in decreased leaflet contact pressure (-4.42% and -11.5%).

    Conclusions:

    • Sinotubular junction and sinus diameter variations significantly affect neoaortic root leaflet contact pressure.
    • A 10% increase in STJ/sinus diameter can elevate leaflet contact pressure, potentially leading to neoaortic valve insufficiency.
    • Geometric optimization of the neoaortic root may improve long-term outcomes for the Ross procedure.