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)

LV Fractional Shortening

LVEDD				mm
LVESD				mm

FS		%
Normal	>25% (M-Mode)
	>18% (Direct 2-D measurement)

Percent change in LV cavity dimensions at the base with systolic contraction. Limited by significant apical wall motion abnormalities.

FS =

LVEDD - LVESD

LVEDD

* 100%

Variable	Definition
Input
LVEDD	LV end-diastolic dimension (mm)
LVESD	LV end-systolic dimension (mm)
Output
FS	Fractional Shortening (%)
Normal	>25% (M-Mode)
	>18% (Direct 2-D measurement)

References

	Lang RM, et al. Recommendations for chamber quantification. J Am Soc Echocardiogr 2005; 18:1444.

	Lewis RP, et al. Relationship between changes in the left ventricular dimension and ejection fraction in man. Circulation 44:548; 1971.

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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.