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Regurgitant Fraction by PISA
Pulmonary Regurgitation
Calcs>Pulmonary Regurgitation>RF by PISA>1
Calculator
Radius
cm
RV Jet VTI cm
Vmax m/sec
VA cm/sec
Angle degrees
RVOT Diam cm
PV VTI cm
 
ERO cm2
RV mls
SV mls
RF %

 
How to get a Regurgitant Fraction in Pulmonic Regurgitation.
 
Step 1:  Obtain a CFD of the PR Jet with a good PISA formation under zoomed view.  The Arch SAX, DTG PVLAX, or TG PVLAX views should provide a good view of the pulmonary valve.  The RVIO view can also be used, although Vmax cannot be obtained with this view.
 
Step 2: 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.
 
Step 3: 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.
 
Step 4: Obtain the angle of the PISA formation. The angle is typically 180 degrees.
 

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