Effective Regurgitant Orifice by PISA

Calculator

Radius	cm
Jet VTI	cm
Vmax	m/sec
VA	cm/sec
Angle	degrees

ERO	cm²

Formulas:

ERO = 2 * pi * r2 * VA * angle / 180 / Vmax

How to get a Regurgitant Volume in Tricuspid Regurgitation.

Step 1: Obtain a CFD of the TR Jet with a good PISA formation under zoomed view. The ME 4CV, ME RVIO or ME BCV with the best and largest PISA formation should be used.

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.

Instution Info

User Info

CME Info

Help

User License

HIPAA

References

Calcs

This activity has been planned and implemented in accordance with the accreditation requirements and policies of the Accreditation Council for Continuing Medical Education through the joint providership of University of Nebraska Medical Center, Center for Continuing Education and JLS Interactive, LLC.

The University of Nebraska Medical Center, Center for Continuing Education is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians.

This activity is approved by the American Society of Radiologic Technologists (ASRT) as sonography-related continuing education (CE). Credit(s) issued for successful completion of ASRT-approved CE activities are accepted by the American Registry of Diagnostic Medical Sonography, American Registry of Radiological Technologists, Cardiovascular Credentialing International and Canadian Association of Registered Diagnostic Ultrasound Professionals. Contact the applicable registry for additional information / restrictions on their acceptance of ASRT CE credit.