CSE - CardioMath

Aortic Valve Velocity Ratio	LV 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 V_Max)	LV Fractional Shortening	PISA (Mitral regurgitation)
dP/dt (LV contractility)	LV Mass and LV Mass Index	PISA (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 Equation	Stroke Volume, Cardiac Output
LV EF (Dumesnil Method)	Myocardial Performance Index (LV)

dP/dt Isovolumic Phase Index of LV Contractility

Time

ms (1-3 m/s MR)

dP/dt				mmHg/s
Normal		>1200		mmHg/s

The LV contractility dP/dt can be estimated by using time interval between 1 and 3m/sec on MR velocity CW spectrum during isovolumetric contraction i.e. before aortic valve opens when there is no significant change in LA pressure.

dP/dt =

Variable	Definition
T	Time (1 to 3 m/sec MR) (seconds, s)
dP/dt	dP/dt (mmHg/s)
Normal	≥1200 mmHg/s

References

	Bargiggia GS, et al. A. new method for estimating left ventricular dP/dt by continuous wave Doppler echocardiography: Validation studies at cardiac catheterization. Circulation 1989; 80: 1287-1292.

	Chung N, et al. Measurement of left ventricular dp/dt by simultaneous Doppler echocardiography and cardiac catheterization. J Am Soc Echocardiogr 1992; 5:147-152.

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Author: Dr. Chi-Ming Chow

Developer: Edward Brawer

Disclaimer: The calculators provided are not meant to be a substitute for professional advise and are not to be used for medical diagnosis. All calculations must be confirmed before clinical use or diagnostic purposes by qualified medical professionals. The authors make no claims of the accuracy of the information contained herein. The authors make no claims whatsoever, expressed or implied, about the authenticity, accuracy, reliability, completeness or timeliness of the material, software, text, graphics and links given. In no event shall the authors, its suppliers, affiliates or any third parties be liable in any manner whatsoever for any damage arising upon use of any information provided.