Overview
Fetal anemia refers to a reduction in red blood cell mass in the fetus, often leading to hemodynamic instability and growth restriction. It can be caused by various factors, including vascular anomalies such as extra-abdominal umbilical vein varix, which can provoke hemolytic processes 1.Diagnosis
Key Diagnostic Criteria: Elevated middle cerebral artery peak systolic velocity (≥1.5 MoM) suggesting fetal anemia 1.
Recommended Tests: Doppler ultrasound assessment, particularly focusing on middle cerebral artery Doppler for anemia screening 1.
Additional Findings: Fetal cardiomegaly, decreased fetal movements, and umbilical vein varix detected via ultrasound 1.Management
First-Line Treatments: Intrauterine transfusions to address severe anemia and circulatory failure 1.
Adjunctive Measures: Close monitoring of fetal status post-transfusion to prevent complications and manage nonreassuring fetal conditions 1.Special Populations
Pregnancy: Extra-abdominal umbilical vein varix associated with significant perinatal risks including fetal heartbeat abnormalities and increased risk of fetal death 1.Key Recommendations
Antenatal surveillance with Doppler ultrasound is crucial for early detection of fetal anemia in cases with umbilical vein varix 1 (Evidence: Moderate).
Intrauterine transfusion should be considered for severe fetal anemia to improve fetal outcomes and prolong gestation 1 (Evidence: Weak).
Prompt delivery by cesarean section may be necessary if fetal status remains nonreassuring despite interventions 1 (Evidence: Expert opinion).References
1 Io S, Kondoh E, Iemura Y, Minamiguchi S, Chigusa Y, Mogami H et al.. Severe fetal anemia as a consequence of extra-abdominal umbilical vein varix: A case report and review of the literature. Congenital anomalies 2021. link