J. M. Martínez

Reference ranges for uterine artery mean pulsatility index at 11–41 weeks of gestation

To construct gestational age (GA)‐based reference ranges for the uterine artery (UtA) mean pulsatility index (PI) at 11–41 weeks of pregnancy.

A classification system for selective intrauterine growth restriction in monochorionic pregnancies according to umbilical artery Doppler flow in the smaller twin

To evaluate a classification of selective intrauterine growth restriction (sIUGR) in monochorionic (MC) twins based on the characteristics of umbilical artery (UA) Doppler flow in the smaller twin, in terms of association with clinical outcome and with the pattern of placental anastomoses.

Uterine artery Doppler at 11–14 weeks of gestation to screen for hypertensive disorders and associated complications in an unselected population

To establish reference values for the first‐trimester uterine artery (UtA) pulsatility index (PI) and to investigate the role of UtA Doppler in the early prediction of hypertensive disorders and their associated complications in an unselected Mediterranean population.

Sequential changes in uterine artery blood flow pattern between the first and second trimesters of gestation in relation to pregnancy outcome.

To describe sequential changes in uterine artery waveform between the first and second trimesters of gestation and to analyze their association with the subsequent risk of hypertensive disorders and fetal growth restriction (IUGR).

Monochorionic twins with selective intrauterine growth restriction and intermittent absent or reversed end-diastolic flow (Type III): feasibility and perinatal outcome of fetoscopic placental laser coagulation

To assess the feasibility and impact on perinatal outcome of fetoscopic laser coagulation of placental anastomoses in monochorionic twins with selective intrauterine growth restriction (sIUGR) and intermittent absent or reversed end‐diastolic flow (iAREDF) in the umbilical artery (Type III), in comparison with expectant management.

The role of Doppler studies in predicting individual intrauterine fetal demise after laser therapy for twin–twin transfusion syndrome

To investigate the role of Doppler studies in predicting individual fetal demise in patients scheduled for selective laser photocoagulation of communicating vessels (SLPCV) for twin–twin transfusion syndrome (TTTS).

Doppler assessment of the aortic isthmus and perinatal outcome in preterm fetuses with severe intrauterine growth restriction

To evaluate the characteristics and association with perinatal outcome of the aortic isthmus (AoI) circulation as assessed by Doppler imaging in preterm growth‐restricted fetuses with placental insufficiency.

Monitoring of fetuses with intrauterine growth restriction : longitudinal changes in ductus venosus and aortic isthmus flow

To explore in growth‐restricted fetuses the sequence of changes in aortic isthmus and ductus venosus blood flow in relation to other arterial Doppler parameters commonly used to evaluate fetal wellbeing.

Accuracy of four-dimensional spatiotemporal image correlation echocardiography in the prenatal diagnosis of congenital heart defects

To evaluate the accuracy of four‐dimensional (4D) spatiotemporal image correlation (STIC) echocardiography for the diagnosis of fetal congenital heart disease (CHD) in a selected high‐risk population.

Twin–twin transfusion syndrome in a dizygotic monochorionic–diamniotic twin pregnancy

We present a case of twin–twin transfusion syndrome with discordant gender. Monochorionicity was confirmed by surgical pathology. Cytogenetic analysis showed normal 46,XX and 46,XY karyotypes. Microsatellite analysis using reliable pericentromeric markers was consistent with dispermic fertilization of two separate ova. This suggests that monochorionicity, rather than zygosity, may be responsible for the development of placental vascular anastomoses.