Ageing, Hypertension and Aortic Valve Stenosis: A Conscious Uncoupling

Area of Science:

• Cardiology
• Vascular Biology
• Biomedical Engineering

Background:

• Aortic valve stenosis (AS) is now understood as a complex condition involving both valvular obstruction and arterial properties.
• Elderly patients with AS often have hypertension and aortic remodeling, contributing to increased cardiac afterload.
• The interplay between valvular function and arterial mechanics in AS is crucial for understanding disease progression.

Purpose of the Study:

• To review current and emerging methods for quantifying valvulo-arterial impedance in patients with aortic valve stenosis.
• To highlight the importance of assessing global left ventricular (LV) load in AS.
• To emphasize the shift in perspective from fixed afterload to a dynamic valvulo-arterial system.

Main Methods:

• Review of existing literature and emerging techniques for measuring valvulo-arterial impedance.
• Discussion of methods to estimate pulse wave velocity and its role in wave reflection.
• Exploration of techniques to assess central aortic pressure augmentation during systole.

Main Results:

• Arterial stiffening, indicated by increased pulse wave velocity, leads to earlier wave reflections.
• These reflections augment systolic pressure in the proximal aorta, increasing LV afterload.
• Elevated global LV afterload negatively impacts LV remodeling, function, and survival in AS patients.

Conclusions:

• Aortic valve stenosis is a valvulo-arterial disease requiring assessment of both components.
• Accurate quantification of valvulo-arterial impedance is essential for understanding global LV load.
• Future research should focus on integrating valvular and arterial assessments for comprehensive AS management.