Assessing the Severity of Aortic Stenosis

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To the editor: Assessment of the severity of aortic stenosis is one of the most difficult problems in clinical cardiology. The development of an accurate noninvasive technique to assist in this judgment would indeed be an important advance, and I therefore read the recent article by Schwartz and colleagues (1) with great interest. Unfortunately there are several potentially misleading features of the paper, and I am concerned by the authors' overall conclusion that “an accurate estimate of the aortic valve gradient” can be made in most patients and the need for invasive studies in many patients may be obviated. These

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