Optimal Site for Proximal Optimization Technique in Complex Coronary Bifurcation Stenting: A Computational Fluid...

Area of Science:

• Cardiovascular Interventions
• Biomedical Engineering
• Computational Fluid Dynamics

Background:

• The optimal balloon position for post-optimization technique (POT) in left main (LM) coronary bifurcation stenting is debated.
• Complex LM bifurcations present unique challenges for stenting and hemodynamic optimization.

Purpose of the Study:

• To compare the hemodynamic effects of different balloon positions during final POT in two double stenting techniques.
• To evaluate wall shear stress (WSS) patterns in complex LM coronary bifurcations.

Main Methods:

• Patient-specific coronary bifurcation anatomy reconstructed from coronary computed tomography angiography (CCTA) data.
• Virtual bench testing using DK crush and Nano crush stenting techniques with Orsiro stents.
• Analysis of hemodynamic effects focusing on WSS in different POT balloon positions.

Main Results:

• Performing POT 1 mm distally to the carina cut plane significantly reduced mean WSS values across all lesion sites for both techniques.
• This distal POT position also significantly improved mean WSS values in the side branch (LCX).
• Proximal POT placement resulted in larger areas of low WSS at the carina with both DK and Nano crush techniques.

Conclusions:

• A final POT positioned 1 mm distally to the carina cut plane may lead to more favorable WSS patterns in complex LM bifurcation stenting.
• This technique potentially enhances WSS along all stented segments, particularly in the LCX lesions.