FujiFilm SonoSite Edge II User Manual page 136

the mitral ring and the most distant point (apex) of the chamber contour
i = Disk index
Left Ventricular Dimension (LVD) Fractional Shortening, percent
Oh, J.K., J.B. Seward, A.J. Tajik. The Echo Manual. 3rd ed., Philadelphia: Lippincott, Williams, and Wilkins,
(2007), p.115.
LVDFS = [(LVDD – LVDS)/LVDD] * 100%
where:
LVDD = Left Ventricle Dimension at Diastole
LVDS = Left Ventricle Dimension at Systole
LV Ejection Fraction
Schiller, N.B., Shah, P.M., Crawford, M., et al. "Recommendations for Quantification of the Left Ventricle by
Two-Dimensional Echocardiography." Journal of American Society of Echocardiography
September-October 1989, 2: p.364.
EF =((End Diastolic Volume - End Systolic Volume)/End Diastolic Volume) * 100 (%).
Left Ventricular Posterior Wall Fractional Thickening (LVPWFT), percent
Laurenceau, J. L., M.C. Malergue. The Essentials of Echocardiography. Le Hague: Martinus Nijhoff, (1981),
p.71.
LVPWFT = [(LVPWS – LVPWD)/LVPWD] * 100%
where:
LVPWS = Left Ventricular Posterior Wall Thickness at Systole
LVPWD = Left Ventricular Posterior Wall Thickness at Diastole
Mean Velocity (Vmean) in cm/s
Vmean = mean velocity
Mitral Valve Area (MVA) in cm
Oh, J.K., J.B. Seward, A.J. Tajik. The Echo Manual. 3rd ed., Philadelphia: Lippincott, Williams, and Wilkins,
(2007), p.73-74.
MVA = 220/PHT
where: PHT = pressure half time
220 is an empirical derived constant and may not accurately predict mitral valve area in mitral prosthetic
heart valves. The mitral valve area continuity equation may be utilized in mitral prosthetic heart valves to
predict effective orifice area.
6-10
2
.
Measurement references