Regurgitant Volume by PISA
Pulmonary Regurgitation
· Dr. Kenneth Gross ·
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Calcs>Pulmonary Regurgitation>RV by PISA>1
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Radius
cm
Jet VTI cm
Vmax m/sec
VA cm/sec
Angle degrees
 
ERO cm2
RV mls

 
Formula:  RV =(( 2 x pi x r2 x VA x ) / 180) / Vmax )* RV VTI
 
How to get a Regurgitant Volume in Pulmonary Regurgitation.
 
Step 1:  Obtain a CFD of the PR Jet with a good PISA formation under zoomed view.  The Arch SAX view from the UE window gives a good view of the pulmonary artery.  Sometimes, the DTG view or TG view of the pulmonary artery is acceptable.
 
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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