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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dP/dt Isovolumic Phase Index of RV Contractility

Calculation


Time ms (1-2 m/s TR)


dP/dt mmHg/s
Calculate

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Information

The RV contractility dP/dt can be estimated by using time interval between 1 and 2 m/sec on TR velocity CW spectrum during isovolumetric contraction i.e. before pulmonic valve opens when there is no significant change in RA pressure.

Although the time from 1 to 2 m/s is most commonly used, the best correlation between echocardiographic and invasive measures was found by using the time for the TR velocity to increase from 0.5 to 2 m/s. In this case the numerator for the calculation is 15 mmHg.

dP/dt =
12
T

Variable Definition
T Time (1 to 2 m/sec TR) (seconds, s)
dP/dt dP/dt (mmHg/s)
Likely Abnormal <400 mmHg/s

References


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