The dynamics of pulsatile flow in distensible model arteries

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Medical Fluid Dynamics

Background:

• Atherosclerotic plaques commonly form at arterial bifurcations, leading to conditions like peripheral artery disease.
• Understanding the hemodynamic forces at these sites is crucial for explaining plaque development and arterial wall changes.
• Arterial elasticity and blood flow pulsatility are key factors influencing these processes.

Purpose of the Study:

• To investigate the influence of hemodynamics on atherosclerotic plaque formation in human femoral artery models.
• To analyze the effects of arterial wall elasticity and flow pulsatility on blood flow patterns.
• To calculate shear stresses at bifurcations using laser-Doppler velocity measurements.

Main Methods:

• Utilized laser-Doppler velocimetry for precise blood flow measurements.
• Employed various models: a 35-degree glass bifurcation, elastic-silicone-rubber models (1mm and 2mm wall thickness), and scale models (rigid and elastic).
• Conducted measurements under both steady and pulsatile flow conditions to simulate physiological states.

Main Results:

• Detailed velocity profiles were obtained in different femoral artery bifurcation models.
• Hemodynamic patterns, including shear stress distribution, were quantified.
• The study provided insights into how flow characteristics correlate with conditions conducive to plaque formation.

Conclusions:

• Hemodynamic forces, particularly shear stress, play a significant role in the initiation and progression of atherosclerosis at arterial bifurcations.
• Arterial elasticity and pulsatile flow dynamics are critical factors modulating these hemodynamic forces.
• These findings enhance our understanding of atherosclerotic plaque development and can inform future preventative strategies.