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. 2019 Feb 7;38(4):365–373. doi: 10.14366/usg.18065

Fig. 9. Assessment of fetal heart function using the myocardial performance index (MPI) on tissue Doppler.

Fig. 9.

A, B. From the spectral tissue Doppler in the lateral portion of the mitral valve ring (A), MPI (isovolumetric contraction time [IVCT]+isovolumetric relaxation time [IVRT]/ejection time [ET]) is calculated on the spectral tissue Doppler waveform of the mitral valve (B). LA, left atrium; LV, left ventricle; Sa,annular velocity during ventricular systole; Ea, early diastolic annular relaxation velocity; Aa, annular velocity during the atrial contraction.