Fetal Anemia and Hemodynamic Adaptation in Hemoglobin H Disease: A Longitudinal Prospective Study.

Fetal anemia and cardiac overload worsen after mid-gestation in Hb H disease, especially in Hb H-Constant Spring, with MCA-PSV peaking in late second to early third trimester.

• Why it matters: Understanding fetal hemodynamic changes in Hb H disease is crucial for improving prenatal management and preventing severe outcomes like hydrops and fetal demise.
• What they did: The study prospectively assessed 389 at-risk pregnancies using serial fetal echocardiography and MCA-PSV measurements, with cordocentesis and intrauterine transfusions as needed, and postnatal evaluations.
• The result: Findings show increased fetal anemia and cardiac strain in Hb H disease, particularly in Hb H-CS, supporting the integration of antenatal monitoring and potential intrauterine interventions to improve fetal outcomes.