Accentuated left ventricular lateral wall function compensates for septal dyssynchrony after valve replacement for...

Area of Science:

• Cardiology
• Cardiac Mechanics
• Echocardiography

Background:

• Aortic stenosis (AS) patients undergoing aortic valve replacement (AVR) often exhibit reversed interventricular septal motion despite maintained stroke volume (SV).
• The left ventricular (LV) lateral wall's compensatory role in maintaining SV after AVR requires investigation.

Purpose of the Study:

• To investigate the hypothesis that the LV lateral wall compensates for septal motion disturbances after AVR in AS patients.
• To assess changes in septal and lateral wall motion and strain using speckle tracking echocardiography.

Main Methods:

• Studied 29 severe AS patients before, and 6 and 12 months after AVR.
• Compared patients with 29 age- and gender-matched controls.
• Utilized speckle tracking echocardiography to analyze LV function, including interventricular septal motion, lateral wall motion, and strain.

Main Results:

• Post-AVR, septal radial motion reversed, while lateral strain and displacement increased, compensating for reduced septal motion.
• A significant septal-lateral time delay emerged post-AVR, correlating with accentuated lateral wall motion.
• Stroke volume remained unchanged, correlating with lateral displacement, suggesting preserved cardiac output due to compensatory mechanisms.

Conclusions:

• Accentuated lateral wall displacement effectively compensates for septal dyssynchrony post-AVR, maintaining normal left ventricular ejection fraction and stroke volume.
• The observed recovery and compensatory changes 12 months post-AVR, alongside mass regression, indicate ongoing reverse remodeling and adaptation.