Valve-in-Valve Challenges: How to Avoid Coronary Obstruction.

Area of Science:

• Cardiology
• Interventional Cardiology
• Medical Device Technology

Background:

• Coronary obstruction is a rare but severe complication of transcatheter aortic valve replacement (TAVR).
• Aortic valve-in-valve (VIV) procedures carry a significantly higher risk (~6-fold) for coronary obstruction, particularly with certain bioprosthetic models.
• Obstruction occurs when a dislodged bioprosthetic leaflet occludes the coronary ostium, often during the index procedure but sometimes delayed.

Purpose of the Study:

• To review the clinical challenges and strategies for preventing coronary obstruction during TAVR valve-in-valve procedures.
• To highlight the importance of pre-procedural risk assessment and potential protective measures.

Main Methods:

• Review of clinical data and literature concerning coronary obstruction in TAVR VIV procedures.
• Emphasis on pre-procedural multi-slice computed tomography (MSCT) for risk stratification.
• Discussion of preemptive strategies like coronary wiring and undeployed stent placement.

Main Results:

• High-risk features identified by MSCT include low coronary heights, shallow sinuses of Valsalva, and short virtual transcatheter heart valve to coronary ostial distance (VTC).
• Certain surgical bioprosthesis models are associated with an increased risk.
• Clinical presentation often involves severe hypotension and ECG changes, with high mortality.

Conclusions:

• Pre-procedural identification of high-risk anatomy is crucial for TAVR VIV procedures.
• Proactive protective strategies, though lacking extensive study, may reduce the risk of this complication.
• A clinical perspective is needed to address the challenges of preventing coronary obstruction in VIV procedures.