Figure 1: Selected video frames from an echocardiogram of a child with aortic stenosis demonstrating doming (arrow) of the aortic valve (A) and turbulent flow (B) at the aortic valve (arrow) suggesting aortic valve stenosis. However, the degree of obstruction can only be assessed by Doppler-calculated peak instantaneous and mean gradients across the aortic valve (not shown). LA, left atrium; LV, left ventricle; RV, right ventricle.