Is aortic valve resistance more clinically meaningful than valve area in aortic stenosis?

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Figure 1  .

Inverse curvilinear relation between aortic valve area and aortic valve resistance. The slope is steeper with increasing aortic stenosis severity. This could explain why resistance may provide additional clinical information in severe aortic stenosis, when symptoms generally occur. Conversely it could give less information than aortic valve area in mild or moderate aortic stenosis.