Feto-maternal transfusion after chorionic villus sampling: clinical implications

Area of Science:

• Maternal-fetal medicine
• Prenatal diagnostics
• Immunology

Background:

• Chorionic villus sampling (CVS) is a first-trimester prenatal diagnostic procedure.
• Potential feto-maternal transfusion is a known complication of invasive prenatal procedures.
• Monitoring fetal hemorrhage is crucial for understanding procedural risks.

Purpose of the Study:

• To evaluate feto-maternal transfusion following chorionic villus sampling (CVS).
• To assess the impact of fetal bleeding on alpha-fetoprotein (AFP) levels.
• To determine the relationship between CVS, fetal bleeding, and pregnancy outcomes.

Main Methods:

• Maternal serum alpha-fetoprotein (AFP) levels were measured before and after CVS.
• 283 continuing pregnancies were analyzed.
• Correlation between AFP changes, specimen size, and fetal/neonatal outcomes was examined.

Main Results:

• A significant increase in maternal AFP levels, suggesting fetal hemorrhage, was observed in 72% of pregnancies post-CVS.
• Fetal bleeding appeared transient, resolving shortly after the procedure.
• No association was found between fetal bleeding and adverse fetal or neonatal outcomes.
• AFP level changes correlated with the size of the chorionic tissue removed.

Conclusions:

• Fetal bleeding after CVS is common but generally self-limiting and does not impede neural tube defect screening.
• Maternal Rh iso-immunization is a significant risk requiring consideration and prophylactic anti-D immunoglobulin administration.
• Maternal Rh status should be a contraindication for CVS.