Left atrial appendage: structure, function, imaging modalities and therapeutic options

Area of Science:

• Cardiology
• Medical Imaging

Background:

• The left atrial appendage (LAA) is a primary site for cardiac thrombus formation and subsequent systemic embolism.
• Its complex, variable anatomy necessitates thorough multi-planar imaging for accurate thrombus evaluation.

Purpose of the Study:

• To highlight the importance of comprehensive imaging for left atrial appendage thrombus detection.
• To discuss current and advanced imaging modalities for LAA thrombus assessment.
• To emphasize the need for novel LAA occluder devices.

Main Methods:

• Transesophageal echocardiography (TEE) is the standard imaging modality for ruling out LAA thrombus.
• Doppler imaging aids in assessing LAA function.
• Advanced techniques including 3D TEE, CT, and MRI offer enhanced thrombus detection and characterization.

Main Results:

• Variable LAA anatomy requires multi-plane imaging for complete thrombus assessment.
• TEE with Doppler provides essential functional and morphological data.
• 3D imaging modalities (TEE, CT, MRI) improve thrombus detection and sizing.

Conclusions:

• Accurate thrombus detection in the LAA is critical for preventing systemic embolism.
• A combination of imaging techniques ensures comprehensive LAA evaluation.
• Development of innovative transcatheter LAA occluder devices is essential for LAA-related embolism prevention.