Simultaneous Functional and Morphological Assessment of Left Atrial Appendage by 3D Virtual Models

Area of Science:

• Cardiovascular Imaging
• Medical Image Analysis
• Cardiac Surgery

Background:

• The left atrial appendage (LAA) is a primary site for thrombus formation in atrial fibrillation patients.
• Accurate characterization of LAA function and morphology is vital for planning left atrial appendage closure interventions.
• Current standard analysis relies on manual 2D delineations, which are time-consuming and potentially less accurate.

Purpose of the Study:

• To introduce and validate a comprehensive 3D analysis approach (3D-S) for left atrial appendage (LAA) characterization.
• To enable simultaneous assessment of LAA function and morphology throughout the cardiac cycle with minimal user interaction.
• To compare the reproducibility of the 3D-S method against the conventional 2D manual procedure (2D-S).

Main Methods:

• A novel 3D surface extraction and processing (3D-S) technique was applied to tomographic datasets.
• The method automatically extracts functional and morphologic data across the entire cardiac cycle.
• Validation was performed on ten computed tomography datasets, comparing 3D-S with 2D-S measurements.

Main Results:

• The 3D-S method proved feasible in all ten cases.
• Significant improvements in reproducibility were observed for key metrics including diastolic/systolic ostium area, diastolic/systolic LAA volume, and LAA ejection fraction compared to 2D-S.
• No significant differences in measurements were found between the 3D-S and 2D-S methods, indicating accuracy.

Conclusions:

• A fully 3D approach for left atrial appendage (LAA) characterization has been successfully developed and validated.
• This method allows for simultaneous assessment of LAA function and geometry, crucial for interventional planning.
• The 3D-S approach can enhance patient selection, optimize device sizing for LAA closure, and facilitate patient-specific 3D printing.