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

Table 3 Interobserver and intraobserver reliabilities of Doppler indices

CPR, cerebroplacental ratio; DV-E, early diastolic filling time of ductus venosus (sec); DV-PIV, pulsatility index for vein of ductus venosus; DV-S/a, systolic/atrial wave ratio of ductus venosus; MCA-PI, pulsatility index of middle cerebral artery; MCA-PSV, peak systolic velocity of middle cerebral artery (cm/sec); MV-E/A, E/A ratio of flow across mitral valve; oICT, isovolumetric contraction time measured by placing the caliper at the beginning of valve clicks (sec); pICT, isovolumetric contraction time measured by placing the caliper at the peak of valve clicks (sec); oIRT, isovolumetric relaxation time measured by placing the caliper at the beginning of valve clicks (sec); pIRT, isovolumetric relaxation time measured by placing the caliper at the peak of valve clicks (sec); 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; PF,; time from pulmonary valve opening to pulmonary valve closure (sec); RV-MPI, myocardial performance index of right ventricle; TI, time from tricuspid valve closure to tricuspid valve opening (sec); TV-E/A, E/A ratio of flow across tricuspid valve; UA-PI, pulsatility index of umbilical artery

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