Doppler Ultrasound of the Fetal Descending Aorta: An Objective Tool to Assess Placental Blood Flow Resistance in Pregnancies With Discordant Umbilical Arteries

Objectives To determine the relationship between blood flow in the fetal descending aorta and discordant umbilical arteries (UAs). Methods Pulsed wave Doppler of both UAs and the descending aorta was performed at 4‐weekly intervals between 14 and 40 weeks of gestation in 209 pregnant women. In datasets with discordant UAs, a linear mixed effects model was used to determine the categorical relationship between the UA pulsatility index (PI) (high,...