EchocardiographyExercise StressMiscEchocardiography
Aortic Valve Velocity RatioLV EF (Modified Quinones Equation)Myocardial Performance Index (RV)
AVA (Continuity Equation VTI)LV EF (Simplified Quinones Equation)PCWP by E/Ea (Nagueh Formula)
AVA (Continuity Equation VMax)LV Fractional ShorteningPISA (Mitral regurgitation)
dP/dt (LV contractility)LV Mass and LV Mass IndexPISA (Mitral stenosis)
dP/dt (RV contractility)Mitral valve area (PHT)Qp/Qs
Left atrial pressure (MR)Mitral Valvuloplasty Score (MGH)RVSP (TR)
LA Volume (Biplane Method)Modified Bernoulli EquationStroke Volume, Cardiac Output
LV EF (Dumesnil Method)Myocardial Performance Index (LV)
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Pulmonary-Systemic Flow Ratio (Qp/Qs)

Calculation


LVOT mm
LVOT VTI cm
RVOT mm
RVOT VTI cm


Qp/Qs
Calculate

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Information

Qp/Qs can be estimated by using 2-D echo and spectral Doppler measurements in patients who have intra- or extra-cardiac shunts e.g. atrial or ventricular septal defects.

Qp =
RVOT VTI * π *
RVOT
2
2
Qs =
LVOT VTI * π *
LVOT
2
2
Qp/Qs Ratio = Qp/Qs

Variable Definition
Input
LVOT Left ventricular outflow tract diameter (mm)
LVOT VTI RVOT subvalvular velocity time integral (cm)
RVOT Left ventricular outflow tract diameter (mm)
RVOT VTI RVOT subvalvular velocity time integral (cm)
Output
Qp/Qs Pulmonary-Systemic Shunt Ratio

References


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