From the case:
Myocardial performance index formula
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Fetal ventricular inlet outlet flow diagram
E wave = passive flow from Atrium to Ventricle
A wave = atrial contraction
c = isovolumetric contraction time (IVCT)
S = ventricular systole, et = ejection time
r = isovolumetric relaxation time (IVCT)
MPI = myocardial performance index
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