Placental and fetal hemodynamics in prolonged pregnancies.

OBJECTIVE

We hypothesized that Doppler measurements of the placental and fetal central and peripheral hemodynamics would predict adverse outcomes in prolonged uncomplicated singleton pregnancies.

METHOD: A total of 160 participants were recruited to this study. Doppler measurements of placental and fetal hemodynamics as well as cardiotocography (CTG) were assessed prior to induction of labor at >41+ weeks. CTG during delivery, umbilical artery (UA) pH and base excess at birth and neonatal data were evaluated.

RESULTS

In 16% of cases the outcome was unfavorable, defined as UA pH <7.10, 5-min Apgar score <7, cesarean delivery for fetal distress and/or need for admission to neonatal intensive care. There were no differences in the pulsatility indices of the uterine and umbilical arteries, middle cerebral artery, descending aorta, ductus venosus and inferior vena cava between the groups with favorable and unfavorable outcome. In addition, the ventricular inflow patterns, outflow velocities of the great arteries, cardiac outputs and myocardial performance indices were similar between the groups.

CONCLUSION

Doppler parameters of the placental and fetal central and peripheral hemodynamics do not differ prior to the induction of labor in prolonged pregnancies with favorable and unfavorable outcomes. This suggests that their value is limited and that other clinical tools are needed for intermittent fetal surveillance in prolonged pregnancies. © 2016 John Wiley & Sons, Ltd.