Table 1. Proposed risk factors for acute coronary occlusion following transcatheter aortic valve replacement.

A short distance between the aortic annulus and the coronary ostia (< 10 mm).

A narrow aortic root (< 28 mm at the sinuses of Valsalva).

Bulky calcification of the native leaflets.

Signs of coronary compromise during balloon aortic valvuloplasty, such as ST-segment elevation in the electrocardiogram, and extrinsic compression of or reduced flow in the coronary artery on angiogram or transesophageal echocardiogram.

A leaflet length to coronary sinus height ratio greater than 1.

High implantation depth.