Effect of transcatheter aortic valve replacement on left atrial function

Area of Science:

• Cardiology
• Cardiac Surgery
• Medical Imaging

Background:

• Severe aortic stenosis (AS) poses significant risks.
• Transcatheter aortic valve replacement (TAVR) is a key treatment for severe AS.
• Left atrial (LA) function is crucial for cardiac health and predicting outcomes.

Purpose of the Study:

• To evaluate the impact of TAVR on left atrial volumetric function and volume.
• To determine if LA volume and function predict adverse outcomes post-TAVR.
• To assess changes in LA reservoir, conduit, and booster pump functions after TAVR.

Main Methods:

• Retrospective analysis of 121 patients with severe AS undergoing TAVR.
• Measurement of LA volume indices (LAVI max, LAVI min, LAVIpre-A) using biplane Simpson's method at baseline, 1 month, and 1 year.
• Calculation of LA reservoir, conduit, and booster pump functions; follow-up for atrial fibrillation (AF), hospitalization, and mortality.

Main Results:

• LA reservoir and conduit functions significantly improved post-TAVR (P < 0.01).
• Booster pump function showed no significant change (P = 0.18).
• Baseline enlarged LA was associated with increased AF risk (HR: 4.72, P = 0.04).
• Non-AF group showed progressive decrease in LAVI max and RVSP, unlike the AF group.
• Both groups had decreased left ventricular filling pressure, with a more marked decrease in the non-AF group.

Conclusions:

• TAVR enhances LA reservoir and conduit functions over time.
• Failure to achieve negative LA remodeling post-TAVR correlates with a higher incidence of new-onset atrial fibrillation.
• LA volumetric parameters are important for predicting outcomes after TAVR.