Improved Endothelial and Autonomic Function after Transcatheter Aortic Valve Implantation

Area of Science:

• Cardiology
• Vascular Biology
• Autonomic Neuroscience

Background:

• Degenerative aortic stenosis involves atherosclerotic-like changes affecting endothelial and autonomic function.
• Transcatheter aortic valve implantation (TAVI) is a key treatment for severe aortic stenosis in high-risk patients.
• The impact of TAVI on endothelial function (flow-mediated dilation, FMD) and autonomic function (heart rate variability, HRV) requires further investigation.

Purpose of the Study:

• To prospectively evaluate the effects of TAVI on endothelial function (FMD) and autonomic function (HRV).
• To assess changes in FMD and HRV at early (≤48 hours) and late (3-6 months) follow-up periods post-TAVI.

Main Methods:

• 50 patients with severe aortic stenosis undergoing TAVI were enrolled.
• FMD and HRV parameters were measured at baseline (pre-TAVI), early post-TAVI, and late post-TAVI.
• Statistical analysis correlated echocardiographic parameters and NT-proBNP with changes in FMD.

Main Results:

• FMD significantly improved post-TAVI (2.8% to 4.7%) and was maintained at late follow-up.
• Autonomic function (HRV parameters like HF, SD1/SD2, SDRR) showed improvement at late follow-up.
• Baseline and post-TAVI echocardiographic parameters and NT-proBNP levels predicted FMD changes.

Conclusions:

• TAVI leads to significant improvements in both endothelial (FMD) and autonomic (HRV) functions.
• Endothelial function improves early and remains stable, while autonomic function improves over the long term post-TAVI.
• These improvements are likely attributed to hemodynamic changes and left ventricular remodeling following aortic valve obstruction relief.