关键词: 脐动脉血流, 胎儿生长受限, 选择性胎儿生长受限, 舒张末期血流缺失

Abstract: Umbilical artery blood flow monitoring is widely used in obstetrics as a non-invasive method for evaluating fetal placental hemodynamics. Umbilical artery doppler blood flow waveform mainly reflects the vascular resistance of placenta，which is affected by the development of villous blood vessels. Meanwhile，gestational age，fetal heart rate，fetal respiration and hiccup，fetal movement，sampling position of umbilical cord，fetal sex，placental weight and fetal weight also have certain influence .Evidence-based medical evidence recommends umbilical artery Doppler ultrasound as  fetal monitoring method for fetal growth restriction and twin selective growth restriction. The significance of umbilical artery blood flow monitoring in low-risk populations remains controversial. Absence of end-diastolic blood flow or end-diastolic reflux is significantly associated with significantly poor perinatal outcomes，and care should be taken to exclude congenital abnormalities and aneuploidy of the fetus. Obstetric management of abnormal umbilical artery blood flow depends on the severity of the abnormal umbilical artery Doppler findings，the severity of the underlying obstetric complications，and the gestational age，which should be given individualized management.

Key words: umbilical artery blood flow, fetal growth restriction, selective fetal growth restriction, absence of end-diastolic flow velocity（AEDV）