The left atrial appendage: from embryology to prevention of thromboembolism

Area of Science:

• Cardiology
• Medical Imaging
• Thrombosis Research

Background:

• The left atrial appendage (LAA) is a significant source of thromboembolism in patients with non-valvular atrial fibrillation (AF).
• Effective management of AF necessitates a thorough understanding of LAA structure, function, and thrombosis.
• Current therapeutic strategies increasingly target the LAA for intervention.

Purpose of the Study:

• To provide foundational knowledge on LAA anatomy and function.
• To review current imaging modalities for identifying LAA anatomical variations.
• To elucidate the pathogenesis of LAA thrombosis and examine treatment options in AF patients.

Main Methods:

• Review of anatomical and functional aspects of the LAA.
• Analysis of current imaging techniques for LAA morphology.
• Examination of pathogenetic mechanisms of LAA thrombosis.
• Evidence review of treatment strategies, including anticoagulation and interventional therapies.

Main Results:

• The LAA's critical role in AF-related thromboembolism is confirmed.
• Various imaging tools aid in characterizing LAA anatomy and identifying variations.
• Understanding LAA thrombosis mechanisms informs treatment selection.
• Non-vitamin K antagonist oral anticoagulants and interventional approaches are key treatment strategies.

Conclusions:

• Comprehensive knowledge of LAA anatomy, thrombosis, and imaging is essential for optimal AF patient management.
• Targeting the LAA with device therapies is a viable strategy for thromboembolism prevention.
• A multi-faceted approach combining medical and interventional treatments is key for managing LAA-related risks in AF.