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)

Myocardial Performance Index (LV) - Tei Index

MCOT				ms
LVET				ms

LV MPI
Normal		0.39 ±0.05
Dilated cardiomyopathy		0.59 ±0.10

Also known as the Tei index. It is an index that incorporates both systolic and diastolic time intervals in expressing global systolic and diastolic ventricular function. Systolic dysfunction prolongs prejection (isovolumic contraction time, IVCT) and a shortening of the ejection time (ET). Both systolic and diastolic dysfunction result in abnormality in myocardial relaxation which prolongs the relaxation period (isovolumic relaxation time, IVRT).

LV MPI =

IVCT + IVRT

LVET

MCOT - LVET

LVET

Variable	Definition
Input
MCOT	Mitral Valve Closure to Opening Time (ms)
LVET	LV Ejection time (ms)
Output
LV MPI	LV Myocardial Performance Index
Normal	0.39 ±0.05
Dilated cardiomyopathy	0.59 ±0.10

References

	Tei C, Ling LH, Hodge DO, et al. New index of combined systolic and diastolic myocardial performance: a simple and reproducible measure of cardiac function - a study in normals and dilated cardiomyopathy. J Cardiol 1995;26:357-366.

	Oh JK et al. The Echo Manual. 2nd ed. p. 55, 1999.

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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.