Effect of Elliptical LV Outflow Tract Geometry on Classification of Aortic Stenosis in a Multidisciplinary Heart Team Setting

Severe aortic stenosis (AS) is defined as an aortic valve area (AVA) ≤1.0 cm2, a mean gradient ≥40 mm Hg, and/or peak velocity ≥4 m/s [(1)][1]. These measurements are most often made by transthoracic echocardiography (TTE), which may underestimate AVA because it assumes a circular left