Arterial Path Length for Arterial Stiffness: Methodological Consideration.

Area of Science:

• Cardiovascular Physiology
• Biomedical Engineering
• Medical Imaging

Background:

• Carotid-femoral pulse wave velocity (cfPWV) is a key indicator of central arterial stiffness.
• Standardization of pulse travel distance measurement for cfPWV remains a challenge.
• Existing methods for determining pulse travel distance lack universal acceptance.

Purpose of the Study:

• To assess the validity and convertibility of two common cfPWV travel distance estimations.
• To develop a conversion equation for unifying cfPWV values from different methodologies.
• To enhance the reliability and comparability of arterial stiffness measurements.

Main Methods:

• cfPWV was calculated in 227 adults using two distinct travel distance methods: subtraction and 80% estimation.
• Measurements were validated against 3D arterial tracing derived from magnetic resonance imaging (MRI).
• A conversion factor was derived to reconcile cfPWV values obtained by the different methods.

Main Results:

• The 80% method showed better agreement with MRI reference values for cfPWV (r=0.96).
• Pulse transit time was the primary determinant of cfPWV variation (~80%).
• A conversion factor (80% method = subtraction method × 1.1) enabled comparable cfPWV estimations.

Conclusions:

• The subtraction and 80% methods can yield equivalent cfPWV values using a simple conversion factor.
• This standardization improves the consistency of arterial stiffness assessments.
• The findings facilitate more reliable clinical interpretation of cfPWV measurements.