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6-6 Measurement references
E/Ea Ratio
Reynolds, Terry. The Echocardiographer’s Pocket Reference . 2nd ed., School of Cardiac Ultrasound,
Arizona Heart Institute, (2000), p.225.
E Velocity/Ea velocity
where:
E velocity = Mitral Valve E velocity
Ea = annular E velocity, also known as E prime
Effective Regurgitant Orifice (ERO) in mm
2
Oh, J.K., J.B. Seward, A.J. Tajik. The Echo Manual . 3rd ed., Lippincott, Williams, and Wilkins, (2007),
p.73-76, p.210.
ERO = MV Flow Rate/ MR Vel * 100
Ejection Fraction (EF), percent
Oh, J.K., J.B. Seward, A.J. Tajik. The Echo Manual .3rd ed., Lippincott, Williams, and Wilkins, (2007),
p.115-116.
EF = [(LVEDV – LVESV)/LVEDV)] * 100%
where:
EF = Ejection Fraction
LVEDV = Left Ventricular End Diastolic Volume
LVESV = Left Ventricular End Systolic Volume
Elapsed Time (ET) in msec
ET = time between velocity cursors in milliseconds
FAC (LV)
Dennis, A.T. et al. “Haemodynamics in women with untreated pre-eclampsia.” Anaesthesia . (2012), 67:
p.1105-1118.
LV FAC (%) = (LV EDA – LV ESA) / LV EDA * 100
where:
LV FAC = Left Ventricular Fractional Area Change (%)
LV EDA = Left Ventricular End-diastolic area (cm^2)
LV ESA = Left Ventricular End-systolic area (cm^2)