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Measurement of the fetal modified myocardial performance index. Each cursor should be placed at the beginning of each valve click, and the modified myocardial performance index is calculated as the sum of ICT and IRT divided by ejection time. AV, aortic valve; MV, mitral valve; ICT, isovolumetric contraction time; IRT, isovolumetric relaxation time; ET, ejection time.
