Coronary Access After TAVR With a Self-Expanding Bioprosthesis: Insights From Computed Tomography.

OBJECTIVES

The authors sought to estimate possible interference of the Medtronic Evolut R/Pro transcatheter heart valve (THV) frame with coronary access using multislice computed tomography (MSCT) data.

BACKGROUND

Lower-risk patients undergoing transcatheter aortic valve replacement (TAVR) endure a high cumulative risk of coronary events, but coronary access can be challenging.

METHODS

In 101 patients who received an Evolut R/Pro THV, post-TAVR MSCT (performed at a median of 30 days after TAVR) was used to assess possible interference of the elements of the THV frame with coronary access.

RESULTS

The closest cell of the THV frame vertically aligned with the coronary ostium was located opposite the ostium in 58% and 63%, below the ostium in 22% and 30%, or above the ostium in 20% and 7% of left and right coronary arteries, respectively. The free sinus of Valsalva space between the THV frame and the coronary ostium was 0.45 ± 0.17 cm and 0.44 ± 0.17 cm for the left and right coronary arteries, respectively, and showed a stepwise decrease with decreasing THV size (p < 0.001). Bioprosthetic valve commissures were antianatomic (i.e., not aligned with native commissures) in 45 patients (47%), and the commissural post was overlapping a coronary ostium in 15 patients (16%). Two patients (2.0%) had a possible interference of the paravalvular sealing skirt with coronary access.

CONCLUSIONS

Using post-TAVR MSCT data, the main mechanism of potential interference of Evolut R/Pro frame with coronary access was an antianatomic commissural post overlapping the coronary ostium.