Flow-dependent vasomotor dysfunction of the popliteal artery related to common carotid artery intima-media thickness

Area of Science:

• Vascular Biology
• Cardiovascular Disease
• Diagnostic Imaging

Background:

• Atherosclerosis is a progressive vascular disease characterized by endothelial dysfunction and arterial wall thickening.
• Flow-mediated vasodilation and intima-media thickness are established markers of early atherosclerosis.
• The popliteal artery's role in assessing early atherosclerosis via vasodilation has been less explored compared to other arteries.

Purpose of the Study:

• To investigate the correlation between flow-mediated endothelium-dependent vasodilation in the popliteal artery and intima-media thickness of the common carotid artery.
• To evaluate popliteal artery vasodilation as a potential early marker for atherosclerosis in at-risk populations.

Main Methods:

• Ultrasound was used to measure popliteal artery diameter at rest and during reactive hyperemia following arterial occlusion.
• Intima-media thickness of the common carotid artery was measured in participants.
• Study included patients with hyperlipidemia, coronary artery disease, and healthy controls.

Main Results:

• Healthy individuals demonstrated significant popliteal artery dilation (mean 6.6% increase) in response to hyperemia (p < 0.01).
• Patients with hyperlipidemia and coronary artery disease showed no significant increase in popliteal artery diameter (mean 0.44% and -1.6%, respectively).
• A strong negative correlation (r = -0.5713, p < 0.001) was observed between popliteal artery vasodilation and common carotid artery intima-media thickness across all subjects.

Conclusions:

• Popliteal artery vasodilation appears to be an impaired marker in hyperlipidemia and coronary artery disease, similar to brachial artery responses.
• Reduced popliteal artery vasodilation is significantly correlated with increased carotid artery intima-media thickness, suggesting its utility in early atherosclerosis detection.