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Regurgitant Fraction by Continuity Equation
Calcs>Pulmonary Regurgitation>RF by CE>1
to get a Regurgitant Volume in Pulmonary Regurgitation.
Measure the Diameter of the RVOT. The diameter
can be of the RVOT should be obtained from the
midesophageal RVIO view, in mid systole, and
under the zoom mode. The view of the RVOT
should not be an obtuse angle view. The
pulmonary valve leaflets should be
clearly seen. The zoom mode will decrease
the error present in the calculation.
Since the RVOT diameter changes throughout systole,
the mid systole measurement should be obtained.
Step 2: Obtain a VTI of the RVOT. The VTI of the RVOT is obtained from a PWD of the RVOT. The CWD of the LVOT should be obtained. The CWD beam should not be off more than 15Âº from parallel to the RVOT flow. After tracing the flow on the echocardiographic machine, a VTI of the CWD tracing will be calculated.
Step 3: Obtain a Tricuspid Valve Diameter. The area of the tricuspid valve can be calculated from this measurement. This enter some inaccuracy into the equation since the mitral valve is not a circle (it is oval). Therefore, the aortic valve could be used instead. This measurement is to be used to generate a value that represents normal forward flow in the cardiac cycle. The valve included in the measurements should not have significant regurgitation.
Step 4: Obtain a Tricuspid Valve VTI. Using the PWD mode, trace the envelope of the entire (E wave and A wave) flow profile of the tricuspid valve.
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.