A possible relation between pressure loading and thickened leaflets of the aortic valve: a model simulation

Area of Science:

• Cardiovascular Science
• Biomechanical Engineering
• Medical Simulation

Background:

• Aortic valve thickening disproportionately affects the noncoronary leaflet compared to coronary leaflets.
• Understanding the biomechanical forces on aortic valve leaflets is crucial for explaining leaflet pathology.
• The role of coronary perfusion in modulating pressure loading on aortic valve leaflets requires further investigation.

Purpose of the Study:

• To investigate the pressure loading transferred to aortic valve leaflets.
• To determine the effects of pressure loading on valvular thickening.
• To explore the influence of coronary perfusion on pressure distribution within the aortic valve.

Main Methods:

• Development of a simplified ascending aorta model.
• Computational simulation of pressure dynamics within the aorta.
• Estimation of pressure loading on both coronary and noncoronary aortic valve leaflets.

Main Results:

• Simulation revealed that coronary perfusion during diastole can decrease pressure loading on coronary leaflets by 5.8% to 17%.
• Coronary arteries significantly influence pressure dynamics within the sinuses of Valsalva.
• Lower pressure loading on coronary leaflets compared to the noncoronary leaflet was observed.

Conclusions:

• Reduced pressure loading on coronary leaflets, partly due to diastolic coronary perfusion, offers a plausible explanation for the lower incidence of thickening in these leaflets.
• The findings highlight the critical role of coronary arteries in maintaining aortic valve health.
• This study provides biomechanical insights into the etiology of aortic valve thickening.