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in a circular fashion around the high velocity jet and will be encoded by the color Doppler. The jet in the receiving chamber becomes wider. In the case of mitral valve regurgitation, this phenomenon will make the regurgitant jet area appear larger that expected for a given volume of regurgitation.
FIGURE 18. A color Doppler recording of MR in a parasternal long (panel A) and a short axis (panel B) view. Measurement of the jet height and width is illustrated by the arrows in panel A and B, respectively.
FIGURE 19. Diagrammatic representation of the concept of PISA used to assess severity of MR.
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