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
MCOT - LVET
Mitral Valve Closure to Opening Time (ms)
LV Ejection time (ms)
LV Myocardial Performance Index
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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