Effective Regurgitant Orifice by PISA in Mitral Regurgitation
FormulaERO = 2 * pi * r² * VA * (α / 180) / (VMAX * 100)
How to get Effective Regurgitant Orifice by PISA in Mitral Regurgitation.
Obtain a CFD of the MR Jet with a good PISA formation under zoomed view. The ME 3CV, ME 4CV, ME 2CV, or ME AVLAX are good views. Use the view with the largest and high quality PISA formation.
Measure the Diameter of the PISA radius. The radius is from the center of the PISA formation, typically from the center of the valve, to the first aliasing velocity. If the PISA is small, try slightly decreasing the aliasing velocity (VA) which will increase the size of the PISA formation.
Obtain a VTI of the Regurgitant Jet by CWD. From the flow profile the Vmax and the VTI of the regurgitant jet can be obtained by tracing the diastolic flow profile.
Obtain the angle of the PISA formation. The angle is typically 180 degrees.