Why Is Carotid-Femoral PWV Considered the Gold Standard for Arterial Stiffness?

Carotid-femoral PWV measures the speed of the pulse wave along the aortic segment — from the carotid artery in the neck to the femoral artery in the upper leg — by acquiring waveforms at both arterial sites simultaneously or sequentially.

This arterial segment is clinically significant for several reasons:

• It comprises the large, compliant central arteries that serve as the primary pressure-buffering mechanism during the cardiac cycle.
• The composition of these arterial walls — particularly the balance between collagen and elastin — directly influences blood flow, pressure transmission, and organ perfusion.
• Because major organs are located centrally, they are directly exposed to pressures and flows from these arteries.
• Carotid-femoral PWV has independent prognostic value and is strongly associated with cardiovascular outcomes.

In contrast, measurements taken in more peripheral arteries (such as those in the limbs) are confounded by changes in arterial wall composition, greater influence from the autonomic nervous system, and greater anatomical distance from the target organs. These factors mean peripheral PWV measurements may not accurately reflect true central arterial stiffness.