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Figure 4 Upper panel, Relation between catheterization-derived percent CSA stenosis and TED-derived percent CSA stenosis, using the corrected continuity equation (i.e., by dividing the prestenotic TVI by 2). Lower panel, Plot of the difference of the values obtained by the two methods versus the mean of the values. QCA = quantitative coronary angiography; TED = transesophageal Doppler echocardiography.
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