Management of Fetal Growth Restriction with Absent End-Diastolic Flow at 37 Weeks
Introduction to Fetal Growth Restriction Management
- The American College of Obstetricians and Gynecologists recommends immediate delivery by cesarean section for a 37-week pregnancy with fetal growth restriction and absent end-diastolic flow on umbilical artery Doppler, as the patient is already past the recommended delivery threshold, making this a high-risk scenario requiring urgent intervention 1, 2
Rationale for Immediate Cesarean Delivery
- The Society for Maternal-Fetal Medicine recommends delivery at 33-34 weeks for absent end-diastolic flow; at 37 weeks, the patient is already 3-4 weeks beyond the recommended delivery window, indicating a high-risk scenario 1, 2
- Absent end-diastolic flow indicates severe placental insufficiency with obliteration of approximately 70% of placental tertiary villi arteries, representing extreme fetal compromise 2
- The fetus cannot tolerate the stress of labor contractions given this degree of placental dysfunction, with 75-95% of growth-restricted pregnancies with absent end-diastolic flow requiring emergency cesarean delivery for intrapartum heart rate abnormalities 1
Guidelines for Delivery
- International guidelines uniformly recommend delivery by 37 weeks when abnormal umbilical artery Doppler is present, and this patient has already reached that threshold 3
Pre-Delivery Considerations
- Coordinate with neonatology for optimal resuscitation planning, as these infants are at high risk for respiratory distress syndrome, necrotizing enterocolitis, and intraventricular hemorrhage 2
- Antenatal corticosteroids are not indicated at 37 weeks, so this should not delay delivery 3, 1
Post-Delivery Management
- Obtain cord arterial and venous pH at delivery to assess the degree of fetal compromise 1, 4
- Send the placenta for histopathologic examination to guide future pregnancy management 1, 4
Guideline Recommendations for Delivery Timing and Mode in Intrauterine Growth Restriction with Absent End‑Diastolic Flow
Delivery Timing Guidelines
- When absent end‑diastolic flow is detected, delivery is recommended at 33–34 weeks gestation because neonatal morbidity and mortality at this stage exceed the risks associated with prematurity. 5
- International obstetric guidelines uniformly advise that delivery should not occur later than 34 weeks for fetuses with absent end‑diastolic flow, and earlier delivery is indicated if sonographic parameters (e.g., worsening Doppler indices or oligohydramnios) deteriorate. [5][6]
Mode of Delivery Recommendations
- Cesarean delivery is the preferred mode when absent end‑diastolic flow is present on umbilical artery Doppler, as the likelihood of successful vaginal birth is low. 5
- In pregnancies complicated by growth restriction and absent end‑diastolic flow, 75–95 % require emergency cesarean delivery due to intrapartum fetal heart‑rate abnormalities. 5
Risks of Expectant Management at Term
- Continuing pregnancy beyond the recommended delivery window (e.g., at 38 weeks) with absent end‑diastolic flow markedly increases the risk of stillbirth and other adverse perinatal outcomes. 5