- Patients with a singleton pregnancy with IUGR defined by fetal abdominal circumference less than or equal to the third percentile for gestational age, and abnormal uterine Doppler. Uterine Doppler was considered pathologic if Pourcelot's resistance index (S-D/S) was equal to or higher than 0.7, and/or if an obvious notch was present. If the placenta was not median, the side of the pathologic Doppler had to be on the same side as the placenta