Mitral valve dynamics in severe aortic stenosis before and after aortic valve replacement

Area of Science:

• Cardiovascular Medicine
• Cardiac Surgery
• Echocardiography

Background:

• The aortic and mitral valves share a fibrous continuity, crucial for cardiac function.
• Severe aortic stenosis (AS) may disrupt this continuity, affecting mitral valve and left ventricular function.
• The impact of AS and aortic valve replacement (AVR) on mitral valve function requires evaluation.

Purpose of the Study:

• To assess the effects of AS on mitral valve function.
• To evaluate how surgical AVR influences mitral valve morphology and dynamics.
• To understand the relationship between aortic stenosis, mitral annular function, and left ventricular performance.

Main Methods:

• Utilized 3D transesophageal echocardiography in 49 patients (controls, AS pre/post-AVR, heart failure).
• Employed custom software for automated 3D tracking of aortic and mitral valves.
• Measured aortic and mitral annular (MA) morphology and displacement throughout the cardiac cycle.

Main Results:

• Aortic stenosis (AS) patients exhibited reduced mitral annular (MA) velocities.
• Post-AVR, both aortic and MA areas significantly decreased compared to controls and pre-AVR.
• MA displacement was reduced after AVR and in heart failure patients.

Conclusions:

• Dynamic MA function is altered by AS and AVR due to disrupted aortic-mitral fibrous continuity.
• Prosthetic valve rings reduce aortic and MA areas, potentially impacting left ventricular blood flow.
• Prosthetic aortic valve design should prioritize flexibility to maintain aortic-mitral fibrous continuity.