Association Between Medial Calcification and Chronic Thrombus: An Optical Frequency Domain Imaging Study

Area of Science:

• Vascular Biology
• Medical Imaging
• Cardiovascular Research

Background:

• Peripheral artery disease (PAD) commonly affects below the knee (BTK) arteries.
• Medial calcification and chronic thrombus are frequent findings in BTK arteries in PAD.
• The interrelationship between medial calcification and chronic thrombus in BTK arteries is not well understood.

Purpose of the Study:

• To investigate the association between chronic thrombus and medial calcification in BTK arteries of PAD patients.
• To utilize optical frequency domain imaging (OFDI) for detailed analysis of vascular structures.
• To identify factors contributing to chronic thrombus formation in this specific arterial segment.

Main Methods:

• Analysis of OFDI frames from BTK arteries in PAD patients undergoing endovascular therapy.
• Quantification of medial calcification and chronic thrombus presence and characteristics.
• Multivariate logistic regression to determine significant associations between OFDI findings and chronic thrombus.

Main Results:

• Medial calcification (51%) and chronic thrombus (23%) were prevalent in analyzed BTK artery frames.
• Medial calcification and its extent (degree of arc-quadrant) were significantly associated with chronic thrombus.
• Medial calcification-related thrombus was the predominant cause (57%) of chronic thrombus, followed by lipidic atherosclerosis (35%).

Conclusions:

• A significant association exists between medial calcification and chronic thrombus in BTK arteries.
• Medial calcification is identified as the primary driver of chronic thrombus formation in these lesions.
• A potential mechanism linking medial calcification to chronic thrombus induction in BTK arteries is proposed.