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)

LAP Estimation by Mitral Regurgitation Jet

MR V_Max				m/s
SBP				mmHg

LAP

mmHg

Left atrial pressure (LAP) can be estimated by measuring the systolic blood pressure and the maximum mitral regurgitation velocity by spectral Doppler provided that there is no significant gradient across the aortic valve.

LAP =

SBP - 4 (MR V_Max)²

Variable	Definition
MR V_Max	Maximum mitral regurgitation velocity (m/sec)
SBP	Systolic Blood Pressure (mmHg)
LAP	Left Atrial Pressure (mmHg)

References

	Gorcscan J, et al. Noninvasive estimation of left atrial pressure in patients with congestive heart failure and mitral regurgitation by Doppler echocardiography. Am Heart J., 121:858, 1991.

	Nishimura RA, et al. Determination of left-sided pressure gradients by utilizing Doppler aortic and mitral regurgitant signals: validation by simultaneous dual catheter and Doppler studies. JACC 11:317, 1988.

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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.