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Comparison of the shape of the CW waveform. On the left, a patient with moderate AS: note how there is a rapid acceleration and an early peak. For comparison, the patient on the right has severe AS. There is a slower acceleration with a late peak. The shape of the CW waveform is maintained irrespective of LVEF and therefore it may be useful to help identify severe AS in difficult scenarios such as low-gradient AS.
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