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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Stroke Volume, Cardiac Output

Calculation


LVOT mm
LVOT VTI cm
HR bpm


SV mL
Normal 60-120 mL
CO L/min
Normal 4-8 L/min
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Information

The Doppler VTI method in estimating stroke volume and cardiac output correlates well with results of concurrent thermodilution cardiac output determinations in patients without significant left-sided valvular regurgitation.

SV =
π *
LVOT
2
2 * LVOT VTI
CO =
SV * HR
1000

Variable Definition
Input
LVOT Left ventricular outflow tract diameter (mm)
VTI1 LVOT subvalvular velocity time integral (cm)
HR Heart rate (bpm)
Output
SV Stroke Volume (mL)
CO Cardiac Output (L/min)

References

Huntsman LL, et al. Noninvasive Doppler determination of cardiac output in man-clinical validation. Circulation 1983; 106:1057-1065.
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Author: Dr. Chi-Ming Chow Developer: Edward Brawer Illustrator: Ellen Ho
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