Mitral valve regurgitation:

Effective Regurgitant Orifice Area (EROA) & MR volume

Flow1 = Area x velocity = 4/2 π r² x Alias velocity

Flow2 = Area x velocity = ERO x MV Vmax

Flow1 = Flow2

4/2 π r² x Alias velocity = ERO x Peak MR velocity

2 π r² x Alias velocity = ERO x Peak MR velocity

ERO = 2 π r² x Alias velocity / Peak MR velocity

MR volume = ERO x MR VTI

MR Radius, cm

MR peak Velocity, cm/s

MR VTI, cm

Alias velocity, cm/s

MR flow rate, ml/s

ERO, cm²

MR Volume, ml

Result

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Reference

Zoghbi, W. A., MD, FASE, & Adams, D., RCS, RDCS, FASE. (2017). Recommendations for Noninvasive Evaluation of Native Valvular Regurgitation. JASE, 30, 4th ser., 1-69. Retrieved June 12, 2017. DOI: 10.1016/j.echo.2017.01.007