Therapeutic vascular compliance change may cause significant variation in coronary perfusion: a numerical study

Area of Science:

• Cardiovascular Research
• Biomedical Engineering
• Medical Physics

Background:

• Aortic stiffening and calcific aortic stenosis (CAS) alter aortic root and valve leaflet microstructure.
• These pathological changes are hypothesized to negatively affect coronary blood flow.
• Previous models did not fully account for coronary ostial flow dynamics.

Purpose of the Study:

• To integrate coronary ostial flow into an existing fluid-structure interaction model.
• To analyze the impact of aortic root stiffening and CAS on coronary perfusion.
• To quantify the relationship between tissue disease and blood flow in the coronary arteries.

Main Methods:

• Development of a fluid-structure interaction model incorporating coronary ostial flow.
• Simulation of altered tissue properties representing aortic stiffening and CAS.
• Analysis of changes in coronary blood flow parameters, including peak velocity.

Main Results:

• Moderate increases in aortic wall stiffness and CAS (leaflet thickening) significantly impacted coronary perfusion.
• Coronary peak velocity dropped markedly when leaflet thickness and aortic wall stiffness exceeded a threefold threshold.
• The study identified critical thresholds for tissue changes affecting coronary flow.

Conclusions:

• Diseased aortic tissue significantly impairs coronary perfusion.
• Mild interventions that increase aortic compliance may improve coronary blood flow.
• Prophylactic measures like exercise and diet could be beneficial for maintaining coronary perfusion.