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Mod‐MPI measurement in normal fetus (A) and fetal growth restriction fetus (B). ET = ejection time; IVCT = isovolumetric contraction time; IVRT = isovolumetric relaxation time; LA = left atrium; LV = left ventricle; MCO = mitral valve closing and open time; MPI = myocardial performance index; RA = right atrium; RV = right ventricle; Tei Index (Mod‐MPI) = (IVCT + IVRT)/ET; MCO = IVCT + IVRT + ET
