Commissural and coronary alignment of the Venus-A valve after transcatheter aortic valve replacement: a retrospective cross-sectional study.

Abstract

Previous studies have shown that neo-commissural orientation of transcatheter heart valve (THV) can influence coronary obstruction during transcatheter aortic valve replacement (TAVR), long-term durability of THV, and coronary artery access for reintervention after TAVR. Specific initial orientations of Evolut R/Pro and Acurate Neo aortic valves can improve commissural alignment. However, the method of achieving commissural alignment with the Venus-A valve remains unknown. Therefore, this study aimed to evaluate the extent of commissural and coronary alignment of the Venus-A self-expanding valve after TAVR using a standard system delivery technique. A retrospective cross-sectional study was performed. At the time of enrollment, patients who underwent pre- and post-procedural electrocardiographically-gated contrast-enhanced CT with a second-generation 64-row multidetector scanner were selected for the study. Commissural alignment was categorized as aligned (0-15° angle deviation), mild (15-30°), moderate (30-45°), or severe (45-60°) commissural misalignment (CMA). Coronary alignment was categorized as having no coronary overlap (CO) (>35°), moderate CO (20-35°), or severe CO (≤20°). The results were represented as proportions to assess the extent of commissural and coronary alignment. Forty-five TAVR patients were ultimately included in the analysis. THVs were shown to be randomly implanted: 20.0% of THVs were aligned, 33.3% had mild CMA, 26.7% had moderate CMA, and 20.0% had severe CMA. The incidence of severe CO was 24.4% with the left main coronary artery, 28.9% with the right coronary artery, 6.7% with both coronary arteries, and 46.7% with one or both coronary arteries. The results showed that commissural or coronary alignment could not be achieved with the Venus-A valve using a standard system delivery technique. Therefore, specific methods to attain alignment with the Venus-A valve need to be identified.