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©2013 UpToDate ® Print Email Continuous wave Doppler in mitral regurgitation The continuous wave Doppler of mitral regurgitation, recorded from the left atrium, shows a jet with a symmetrical shape, suggesting that a significant v-wave in the left atrium is unlikely; however, the jet is dense with a well defined envelope and the early onset of regurgitant flow (arrow), suggesting a moderate degree of regurgitation.