Risk and Mitigation of Coronary Obstruction in Transcatheter Aortic Valve Replacement

Area of Science:

• Cardiology
• Interventional Cardiology
• Cardiac Surgery

Background:

• Acute coronary artery occlusion is a rare but serious complication following transcatheter aortic valve replacement (TAVR).
• Coronary obstruction is defined by angiographic evidence of new partial or complete blockage of a coronary artery.
• Patient risk is influenced by aortic root anatomy, native aortic valve type, and the specific transcatheter heart valve used.

Purpose of the Study:

• To review the risk factors, prevention strategies, and management of acute coronary artery obstruction after TAVR.
• To highlight the challenges and outcomes associated with interventions for this complication.

Main Methods:

• Review of existing literature and case reports on coronary obstruction post-TAVR.
• Analysis of patient-specific anatomical and procedural factors contributing to risk.
• Evaluation of preventative and interventional techniques.

Main Results:

• Key risk factors identified: specific aortic root dimensions, valve designs (e.g., supra-annular valves), and TAVR device characteristics.
• Intentional leaflet laceration is a technique to prevent obstruction.
• Bailout stenting is technically challenging, and conversion to open-heart surgery is often required, associated with significant morbidity and mortality.

Conclusions:

• Acute coronary obstruction is a critical complication of TAVR requiring careful patient selection and procedural planning.
• Preventative measures are preferred, as interventional management carries substantial risks.
• Further research into optimizing TAVR techniques to minimize coronary obstruction is warranted.