Management of Fetal Growth Restriction with High Resistance Umbilical Artery Doppler

Introduction to Fetal Growth Restriction

The American College of Obstetricians and Gynecologists recommends weekly umbilical artery Doppler surveillance for fetuses with high resistance umbilical artery pattern, as this represents Stage 1 deterioration in the predictable cascade of FGR complications, with a high resistance umbilical artery pattern indicating early placental dysfunction due to increased impedance in the fetoplacental circulation 1

The American College of Obstetricians and Gynecologists recommends weekly umbilical artery Doppler as the standard of care for FGR with abnormal umbilical artery resistance, with umbilical artery Doppler being the only surveillance modality with Level I evidence for reducing perinatal mortality, resulting in a 38% reduction 1
Weekly nonstress testing should begin after viability if FGR is confirmed, with consideration of twice-weekly NST with weekly amniotic fluid assessment or weekly biophysical profile 3
Serial growth ultrasounds should be performed every 3-4 weeks, as more frequent ultrasounds may not provide additional benefits due to inherent biometric error 3

The surveillance frequency must escalate immediately if Doppler findings worsen, with decreased but present end-diastolic flow requiring continued weekly Doppler and planned delivery at 37 weeks, absent end-diastolic velocity requiring increased surveillance to 2-3 times weekly, and reversed end-diastolic velocity requiring immediate hospitalization and delivery 3

Delivery timing should be based on the most recent Doppler findings and estimated fetal weight, with high resistance and forward flow present indicating delivery at 38-39 weeks, decreased diastolic flow or severe FGR indicating delivery at 37 weeks, absent end-diastolic velocity indicating delivery at 33-34 weeks, and reversed end-diastolic velocity indicating delivery at 30-32 weeks 3

Antenatal corticosteroids should be administered if delivery is anticipated before 33 6/7 weeks, or between 34 0/7 and 36 6/7 weeks if delivery is likely within 7 days and no previous course has been given 3
Cesarean delivery should be strongly considered if absent or reversed end-diastolic velocity develops, based on the complete clinical picture, as these fetuses have limited physiologic reserve to tolerate labor 3
Magnesium sulfate for neuroprotection should be administered intrapartum if delivery occurs <32 weeks 3

The pediatric team should be notified of prenatal findings at delivery, and postnatal examination is important as structural anomalies can be revealed in up to 7% of cases with prenatal abnormalities 3