ECHO
EQUATIONS
Uncorrected EF = UEF = (LVIDd - LVIDs)2 / LVIDs2
Corrected EF = UEF + [X * (100% - UEF)]
                   Akinetic:                                    X = 0 to 5 %
                   Dyskinetic / aneurysmal:        X = -10 %
    Bernouilli
    Pressure = 4 * (V22 - V12)
    (V22 - V12) being the convective acceleration
    flow acceleration, viscous friction are ignored
AVA = LVOT2 x 0.785 x LVOT VTI
     -------------------------------
                     AoR VTI

-LVOT measured from PSLA from cusp insertion to
cusp insertion
-VTI
LVOT (apical 5)                -VTI AV (apical 4, PSLA)
    Hakki

    AVA = CO / sq(mean Gdt)
(in the absence of pulmonary stenosis)