New method for estimating arterial pulse wave velocity at single site

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Medical Imaging

Background:

• Local pulse wave velocity (PWV) is clinically significant for assessing arterial stiffness.
• Existing methods for PWV estimation often require complex measurements or multiple locations.
• There is a need for simpler, accurate methods to measure local PWV.

Purpose of the Study:

• To introduce and validate a novel 'sum-of-squares' method for estimating local PWV.
• To assess the performance of the new method using simulated, in vitro, and in vivo data.
• To compare the proposed method against classical PWV estimation techniques.

Main Methods:

• Developed a 'sum-of-squares' method utilizing simultaneous blood pressure (P) and arterial diameter (D) at a single location.
• Validated the method using 2D fluid-structure interaction (FSI) simulations, a 1D model of human arteries, and experimental data.
• Compared results against theoretical PWV and established methods like PA-loop and D²P-loop.

Main Results:

• The sum-of-squares method demonstrated good agreement with theoretical PWV values.
• Differences between the proposed method and PA-loop were within 1% (simulations), 3% (in vitro), and 5% (in vivo).
• Methods requiring flow rate (Q) and velocity (U) showed over/underestimation of PWV compared to the proposed method.

Conclusions:

• The sum-of-squares method provides accurate local PWV estimations using readily available pressure and diameter data.
• This single-location approach is a reliable alternative to methods demanding flow or velocity measurements.
• The findings support the use of pressure and diameter waveforms for correct PWV estimation.