Carotid Stiffness After Transcatheter Aortic Valve Replacement

Area of Science:

• Cardiovascular Medicine
• Medical Imaging
• Vascular Biology

Background:

• Severe aortic valve stenosis (AS) significantly impacts cardiovascular health.
• Arterial stiffness is a known complication of AS, affecting large arteries like the common carotid artery.
• Transcatheter aortic valve replacement (TAVR) is a treatment option for severe AS, but its effects on carotid artery mechanics require further investigation.

Purpose of the Study:

• To analyze changes in common carotid artery (CCA) strain properties following TAVR in patients with severe AS.
• To assess the impact of TAVR on arterial compliance and stiffness of the CCA.
• To investigate the relationship between aortic valve area and CCA strain changes post-TAVR.

Main Methods:

• Ultrasound speckle-tracking was used to assess CCA strain parameters before and after TAVR in 59 patients.
• Patients were stratified based on aortic valve area (<0.75 cm² vs. ≥0.75 cm²).
• Pre- and post-procedural strain variables, including radial and circumferential strain and strain rates, were compared.

Main Results:

• TAVR significantly improved CCA radial velocity, radial displacement, circumferential strain, radial strain rate, and circumferential strain rate (P < .05 for all).
• A trend towards increased radial strain was observed post-TAVR (P = .082).
• Reduced arterial wall stiffness was noted after TAVR, with greater improvements seen in patients with more severe AS (smaller aortic valve area).

Conclusions:

• TAVR effectively improves CCA mechanical properties, indicating reduced arterial stiffness.
• The beneficial effects of TAVR on carotid artery mechanics are more pronounced in patients with more severe aortic valve stenosis.
• Ultrasound speckle-tracking is a valuable tool for assessing vascular changes after TAVR.