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English Abstract
Journal Article
[Fetal weight-adjusted intrauterine IgG therapy in neonatal alloimmune thrombocytopenia].
Fetal alloimmune thrombocytopenia is caused by materno-fetal transfer of platelet antibodies. Since the thrombocytopenic fetus is threatened by intracranial hemorrhage, prenatal observation and, if necessary, treatment is required. However, the benefit of therapeutic options, including intravenous IgG (ivIgG), platelet transfusions or fetal IgG transfusions is still controversial. In this study we have evaluated the effect of intrauterine IgG and intraumbilical platelet transfusions on fetal platelet counts. All patients were multiparous women who were immunized against the Zwa antigen during previous pregnancies and had given birth to at least one severely thrombocytopenic infant. First umbilical blood was sampled at the 20th week of gestation. Fetal treatment of IgG was given, on av erage, over 9 weeks. In all cases, fetal IgG levels rose significantly whereas platelet counts did not increase following fetal IgG treatment. We conclude that fetal IgG infusions have no detectable effect on fetal allo-immune thrombocytopenia. Since platelet counts can be very low as early as 20 weeks of gestation, careful fetal monitoring by umbilical blood sampling is essential. Platelet transfusions in short intervals appear to be the only effective regimen to increase platelet counts in thrombocytopenic fetuses at risk.
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