Objective: To compare the outcome after intrauterine transfusion (IUT) between fetuses treated before and those treated after 32 weeks gestation.
Setting: National referral center for intrauterine treatment of red-cell alloimmunization in The Netherlands.
Study Design: Retrospective evaluation of an 11 year period, during which 209 fetuses were treated for alloimmune hemolytic disease with 609 red-cell IUTs. We compared fetal and neonatal outcome in three groups: fetuses only treated before 32 weeks gestation (group A, n=46), those treated both before and after 32 weeks (group B, n=117), and those where IUT was started at or after 32 weeks (group C, n=46).
Results: Survival rate was 48% in group A, 100% in group B, and 91% in group C. Moreover, fetuses in group A were hydropic significantly more often. Short-term perinatal loss rate after IUT was 3.4% in the 409 procedures performed before 32 weeks and 1.0% in the 200 procedures performed after 32 weeks gestation.
Conclusion: Perinatal losses were much more common in fetuses only treated before 32 weeks gestation. Two procedure-related perinatal losses in 200 IUT after 32 weeks remain a matter of concern because of the good prospects of alternative extrauterine treatment.
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