Reference values for fetal Doppler-based cardiocirculatory indices in monochorionic-diamniotic twin pregnancy

Table 4 Correlation coefficients of the association between z-score of the myocardial performance indices and z-score of the ductus venosus indices (n = 442)

variable	oLV-MPI z-score	pLV-MPI z-score	RV-MPI z-score
DV-PIV z-score	−0.036	−0.054	−0.023
DV-S/a z-score	−0.029	− 0.022	− 0.076
DV-E z-score	− 0.155*	− 0.219 †	− 0.033

DV-E, early diastolic filling time of ductus venosus; DV-PIV, pulsatility index for vein of ductus venosus; DV-S/a, systolic/atrial wave ratio of ductus venosus; oLV-MPI, myocardial performance index of left ventricle measured by placing the caliper at the beginning of valve clicks; pLV-MPI, myocardial performance index of left ventricle measured by placing the caliper at the peak of valve clicks; RV-MPI, myocardial performance index of right ventricle
*P < 0.01
†P < 0.001

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