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Calcs>Myocardial Performance>Ejection Fraction>1
How to get an Ejection
Fraction from the LVSAX view.
Step 1: Measure the left ventricular
diameter in end-diastole and end-systole. Do
not measure the based upon the image end-systole
or end-diastole. Position the frame where
the mechanical end-systole and mechanical end-diastole
occur on the ECG (below).
The optimal view for measuring the left ventricular
diastolic area is the left ventricular short axis
view from the mid transgastric acoustic window.
This view has been shown to be predictive of the
ejection fraction. Each area is converted
into left ventricular volume during systole and
diastole. The difference between the left
ventricular volumes in systole and diastole is the
ejection volume. The ejection volume divided
by the end-diastolic volume is the ejection fraction.
The formula used is the Tiecholz formula which
is based upon the spherical volume of the heart
multiplied by a correction factor. Since the
volume of a sphere is the cube of the radius, and
the left ventricle is almost a sphere, a correction
factor to account for the non spherical qualities
of the left ventricle yields a surprisingly accurate
= [7/(2.4 + LVID)] * LVID3
RWMA, either close or distant, may cause the volume
analysis to be incorrect. If the endocardial
boarder is poorly seen, then the area of the left
ventricular cavity may be inaccurate. Failing
hearts (i.e. cardiomyopathy) tend to be more spherical
than normal hearts so the spherical formula may
be more accurate.
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.