Arterial collateral vessels in legs with obliterative arteriosclerosis

Area of Science:

• Vascular Surgery
• Radiology
• Biomedical Engineering

Background:

• Peripheral artery disease (PAD) significantly impacts lower limb circulation.
• Assessing arterial stenosis and collateral circulation is crucial for PAD diagnosis and management.
• Current methods may not fully capture the complex interplay between stenosis and collateral compensation.

Purpose of the Study:

• To present a novel method for evaluating arterial collateral vessels and stenoses using arteriography.
• To correlate the number of collateral vessels with the degree of arterial lumen narrowing in arteriosclerotic legs.

Main Methods:

• A geometric method was developed to assess collateral vessels bypassing arterial stenoses.
• Collateral vessels were counted, and minimum lumen diameters of arterial segments (common iliac, external iliac/common femoral, superficial femoral arteries) were measured.
• Correlation analysis was performed on data from thirty-four legs.

Main Results:

• A significant negative correlation (r = -0.77, P < 0.001) was found between the sum of remaining lumen diameters and the sum of collateral vessels.
• Maximum lower leg blood flow during exercise correlated better with pelvic arterial disease than femoral artery disease.
• Abundant collateral vessels were observed in patients with central arterial stenoses or occlusions.

Conclusions:

• The presented method effectively quantifies collateral vessel compensation for arterial stenoses.
• Collateral vessel assessment is a valuable addition to the evaluation of peripheral artery disease.
• Central arterial lesions are associated with more extensive collateral development.