Materials and Methods: In this prospective cohort study, 60 pregnant women with a gestational age of 32-37 weeks were studied in two groups: group I (women with fetus suspected of FGR according to ultrasound assessment) and group II (women with normal pregnancy). All women underwent Doppler ultrasound of pulmonary artery, umbilical artery, middle cerebral artery, and venous ductus. The pick systolic velocity (PSV) of the trunk of the pulmonary artery was evaluated in the fetus of all participants. After delivery, all infants were studied for respiratory outcomes at birth. Finally, variables included gestational age, fetal estimated weight based on Hadlock table, fetal amniotic fluid index, maternal parity, umbilical artery pulsatility index (PI), middle cerebral artery PI, maximum pulmonary artery velocity (PV), umbilical artery to middle cerebral artery index ratio, and the number of infants admitted to the newborn intensive care unit (NICU) due to respiratory distress were compared between two groups.

Results: Our results showed a significant association between pulmonary artery PI in FGR fetuses with abnormal fetoplacental circulation. The rate of early NICU hospitalization of infants in the group I was higher than group II due to respiratory diseases, as well as the need for oxygen and continuous positive airway pressure (CPAP).

Conclusions: Pulmonary artery color Doppler ultrasound can be effective in diagnosing FGR embryos during pregnancy and making the necessary predictions to reduce prenatal mortality and morbidity in these infants.