Changes of fluid-dynamic parameters in peripheral stenoses with transcutaneous interventions

Area of Science:

• Cardiovascular Medicine
• Biomedical Engineering
• Fluid Dynamics

Background:

• Peripheral vascular disease impacts local intravascular fluid dynamics.
• Percutaneous transluminal laser assisted angioplasty (PTLA) is a common intervention.
• Assessing hemodynamic changes post-PTLA is crucial for evaluating clinical success.

Purpose of the Study:

• To evaluate local intravascular fluid dynamics using hemodynamic parameters.
• To correlate changes in blood flow, Reynolds' numbers, and shear stress with clinical improvement after PTLA.
• To assess the utility of velocity measurements in conjunction with angiography.

Main Methods:

• Collected velocity, quantitative angiography, and laboratory data from 45 patients undergoing 48 PTLA procedures.
• Calculated blood flow, whole blood viscosity, Reynolds' numbers, Womersley numbers, and shear stress.
• Correlated hemodynamic parameters with clinical improvement based on American Heart Association guidelines.

Main Results:

• PTLA significantly reduced peak velocity at stenosis and increased cross-sectional area and trans-stenotic flow.
• Reynolds' numbers and shear stress were significantly altered by PTLA, with varying effects in single versus multiple lesions.
• Pre-intervention hemodynamic parameters, including Reynolds' numbers, correlated significantly with clinical outcomes, correctly classifying 81% of patients.

Conclusions:

• Peak velocity monitoring during angioplasty is feasible, safe, and provides clinically relevant physiological information.
• Combining quantitative angiography, velocity measurements, and laboratory data enhances the evaluation of hemodynamics before and after intervention.
• Fluid dynamic parameters pre- and post-PTLA are significantly correlated with short-term clinical results.