Figure 10.

(a, b) Images obtained before TAVR with (a) transthoracic echocardiography and (b) multidetector CT in an 84-year-old man with severe symptomatic aortic stenosis. The annulus measured 24.7 mm at two-dimensional echocardiographic assessment, resulting in a 26-mm transcatheter heart valve being selected (5.31 cm²), despite the annulus measuring 4.0 cm² at CT, which would typically result in a recommendation of a 23-mm transcatheter heart valve. (c) The postdeployment CT image shows a circular but incompletely expanded transcatheter heart valve, owing to the significant oversizing of the valve based on the single two-dimensional measurement of an elliptical structure.