Irregular anatomical features can alter hemodynamics in Takayasu arteritis

Area of Science:

• Cardiovascular Medicine
• Medical Imaging
• Biomedical Engineering

Background:

• Takayasu arteritis (TA) diagnosis and monitoring are challenging due to a lack of reliable clinical signs, biomarkers, and noninvasive imaging techniques.
• Understanding aortic hemodynamics in TA patients is crucial for disease management.

Purpose of the Study:

• To assess aortic hemodynamics in patients with Takayasu arteritis (TA) using image-based computational fluid dynamics (CFD) simulations.
• To identify hemodynamic differences between TA patients and healthy controls.

Main Methods:

• Patient-specific geometries were reconstructed from CT angiography or MRI angiography in 11 TA patients.
• CFD simulations were performed using physiological boundary conditions.
• Hemodynamic parameters were compared between TA patients and 18 healthy controls.

Main Results:

• TA patients exhibited significantly higher aortic velocities, wall shear stress, and pressure drops compared to controls.
• Abnormal anatomical features in TA patients, including smaller aortic diameters, correlated with these hemodynamic alterations.
• Specific findings included increased velocities (0.9 vs 0.6 m/s) and wall shear stress (14.2 vs 8.0 Pa).

Conclusions:

• CFD analysis reveals significant hemodynamic changes in the aorta of TA patients.
• These changes are linked to morphological abnormalities within the aorta.
• CFD shows potential for monitoring TA progression and guiding future management strategies.