Relationship between coronary artery remodeling and plaque composition in culprit lesions: an intravascular...

Area of Science:

• Cardiovascular Imaging
• Interventional Cardiology
• Biomedical Engineering

Background:

• The in vivo relationship between coronary artery remodeling and culprit plaque composition requires further investigation.
• Spectral analysis of intravascular ultrasound (IVUS) radiofrequency (RF) data offers a novel approach to evaluate this relationship.

Purpose of the Study:

• To investigate the association between coronary artery remodeling patterns and the in vivo composition of culprit plaques.
• To utilize IVUS-RF data for detailed plaque characterization in relation to remodeling.

Main Methods:

• Intravascular ultrasound (IVUS) radiofrequency (RF) data analysis was performed on 56 de novo culprit lesions from 52 patients.
• Coronary artery remodeling was quantified using the remodeling index (RI) based on external elastic membrane and minimum lumen area measurements.
• Plaque composition, including fibrofatty and dense calcium components, was analyzed at minimum lumen area sites.

Main Results:

• Positive remodeling (RI >1.05) was observed in 24 lesions, intermediate remodeling (0.95 ≤ RI ≤ 1.05) in 16, and negative remodeling (RI <0.95) in 16.
• Positive remodeling lesions exhibited a significantly higher percentage of the fibrofatty component compared to negative remodeling lesions (22.5% vs 10.4%, p=0.0001).
• Negative remodeling lesions contained a significantly larger percentage of dense calcium compared to positive remodeling lesions (8.4% vs 2.8%, p=0.016).

Conclusions:

• Culprit plaques associated with positive coronary artery remodeling are characterized by a greater lipid burden.
• Culprit plaques associated with negative remodeling demonstrate a higher content of dense calcium.