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Definition of Left Ventricular Ejection Fraction and Information
Normal LVEF is 55 percent; LVEF below 35 percent indicates severe heart failure.
Because it is not possible to directly measure the volume of blood the left ventricle pumps, cardiologists use indirect methods to calculate the LVEF.
Among these methods are echocardiogram with doppler ultrasound, radionuclide scans, and magnetic resonance imaging (mri), all of which allow the cardiologist to mathematically determine the volume of the ventricle and visualize the flow of blood through the heart.
LVEF is one method to monitor the progression of a degenerative cardiovascular condition such as heart failure as a criterion for heart transplantation.