Would you favor CT AV calcium score or dobutamine stress echo for a patient with symptomatic AS and aortic valve with normal SV/SV index, Vmax 3.4m/s, AVA < 1.0cm2 and mean gradient < 40mmHg?  

This scenario appears to be one of normal flow, low gradient severe aortic stenosis(NF-LG AS). This is one of the least understood variants of low gradient aortic stenosis. The most important focus should be on avoiding measurement errors during echocardiography, which may lead to underestimation of...