RedoTAVR coronary obstruction risk in small annuli: A post-TAVR CT study.

Area of Science:

• Cardiovascular Surgery
• Interventional Cardiology
• Biomedical Engineering

Background:

• Redo-transcatheter aortic valve replacement (redoTAVR) is becoming more common in younger patients.
• Small aortic annuli present unique anatomical challenges for TAVR procedures.

Purpose of the Study:

• To evaluate the predicted risk of coronary obstruction (CO) during redoTAVR.
• To compare this risk between small and non-small aortic annuli.
• To assess the influence of different valve types (self-expanding vs. balloon-expandable) on CO risk.

Main Methods:

• Post-TAVR computed tomography (CT) scans of 167 patients were analyzed.
• Patients were stratified into small (≤430 mm²) and non-small (>430 mm²) annuli groups.
• Risk planes and valve-to-coronary distances were measured to predict CO risk.

Main Results:

• In small annuli, self-expanding valves (SEVs) showed significantly increased predicted CO risk compared to balloon-expandable valves (BEVs) at specific risk planes (node 6 and 5).
• No increased CO risk was observed with SEVs compared to BEVs in non-small annuli.
• Predicted CO risk in small annuli was dependent on valve type and implantation height.

Conclusions:

• The type of index valve and redo implantation height are critical factors for predicting coronary obstruction risk in redoTAVR within small aortic annuli.
• Meticulous planning and execution of redoTAVR are essential, especially in patients with small annuli.