Moderate and severe MR usually lead to an elevation of
peak E velocity and reductions in pulmonary venous systolic
flow wave and the S/D ratio. In severe MR, systolic pulmonary
venous flow reversal can be seen in late systole. Thus,
MR per se can induce changes in transmitral and pulmonary
venous flow patterns resembling advanced LV dysfunction,
with the possible exception of the difference in Ar 2 A duration.
70 Aside from PW signals, the MR velocity recording by
CW Doppler can provide a highly specific, though not sensitive,
sign of increased LA pressure, as discussed previously.
Moderate and severe MR usually lead to an elevation ofpeak E velocity and reductions in pulmonary venous systolicflow wave and the S/D ratio. In severe MR, systolic pulmonaryvenous flow reversal can be seen in late systole. Thus,MR per se can induce changes in transmitral and pulmonaryvenous flow patterns resembling advanced LV dysfunction,with the possible exception of the difference in Ar 2 A duration.70 Aside from PW signals, the MR velocity recording byCW Doppler can provide a highly specific, though not sensitive,sign of increased LA pressure, as discussed previously.
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