Key result
Increasing the height ratio of reconstructed aortic leaflets increased stress (HR_1.2: 1.8 MPa) and wall shear stress, suggesting the height ratio for adults should be less than 1.0.
Why the study?
Aortic valve reconstruction is an alternative treatment for aortic valve disease, but leaflet geometric parameter design still mainly relies on surgeon experience.
Does the geometric height of reconstructed aortic leaflets affect the performance and biomechanical states of the aortic valve?
Does the geometric height of reconstructed aortic leaflets affect the performance and biomechanical states of the aortic valve?
Computational modeling suggests that the height ratio of reconstructed aortic leaflets for adults should be less than 1.0 to optimize opening and closing performance.
Answers are grounded in this paper and cite their sources.
May guide leaflet height selection in modeling; leaves open in vivo validation before surgical adoption.
Background: Although aortic valve reconstruction has become an alternative treatment for aortic valve disease, the design of the geometric parameters of the reconstructed leaflet still mainly depends on the experience of doctors. The present study investigates the effects of the height of the leaflets on the performance and biomechanical states of the reconstructed aortic valve. Methods: This numerical study was carried out using the finite element approach and the lattice Boltzmann method. The dynamic and biomechanical characteristics of the leaflets were evaluated by using the finite element approach, while the blood flow in the aortic sinus was evaluated by applying the lattice Boltzmann method. Three types of leaflets with different heights were designed. Then the dynamic characteristics, stress distribution, and effective orifice area (EOA) of the aortic valve and flow pattern were calculated as the indicators. Results: HR_1.2: 1.8 MPa). Similarly, the low velocity region near the ascending aortic wall and the wall shear stress (WSS) level on the ventricular side of the leaflets also increased along with the increase of the HR of the leaflets. Conclusions: In short, the height of the leaflets mainly affects the opening performance of the reconstructed aortic leaflets. The HR of the reconstructed leaflets for adults should be less than 1.0 to balance the opening and closing performance of aortic leaflets.
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Ma et al. (2022) studied Aortic valve disease. Geometric height of leaflets vs. Leaflets with different heights was evaluated on Dynamic characteristics, stress distribution, effective orifice area, and flow pattern. Increasing the height ratio of reconstructed aortic leaflets increased stress (HR_1.2: 1.8 MPa) and wall shear stress, suggesting the height ratio for adults should be less than 1.0.
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