Coronary Artery Stenting Affects Wall Shear Stress Topological Skeleton

Area of Science:

• Cardiovascular research
• Biomedical engineering
• Hemodynamics

Background:

• Coronary artery disease necessitates stent implantation, but complications like stent thrombosis (ST) and in-stent restenosis (ISR) persist.
• Altered wall shear stress (WSS) due to stent struts is a key factor in ST and ISR.
• Analyzing the WSS topological skeleton offers insights into hemodynamics and vascular disease.

Purpose of the Study:

• To investigate the impact of deployed coronary stents on the WSS topological skeleton.
• To understand how different stent designs and deployment conditions affect local hemodynamics.

Main Methods:

• Computational fluid dynamics (CFD) simulations were conducted on three stented human coronary artery models.
• Models included various stent designs (drug-eluting stents, bioresorbable scaffold) and malapposition/overlapping.
• An Eulerian-based approach was used to analyze WSS topological skeleton features.

Main Results:

• Stent presence significantly alters the coronary artery WSS topological skeleton.
• Repetitive patterns of WSS divergence (contraction proximal, expansion distal to struts) were consistently observed.
• These hemodynamic patterns were independent of stent design, malapposition, or overlapping.

Conclusions:

• Deployed coronary stents induce predictable WSS alterations.
• Understanding these WSS patterns is crucial for elucidating hemodynamics-driven ST and ISR.
• Findings may inform future stent design to mitigate adverse outcomes.