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Fetal alloimmune thrombocytopenia
J B Bussel1, M R Zabusky, R L Berkowitz
1Department of Pediatrics, Cornell Medical Center-New York Hospital, 10021, USA.
The New England Journal of Medicine
|July 3, 1997
Summary
Fetal alloimmune thrombocytopenia, a serious condition from platelet incompatibility, often occurs early and can be severe. A history of antenatal intracranial hemorrhage in an affected sibling indicates a higher risk for the fetus.
Area of Science:
- Perinatology
- Immunology
- Hematology
Background:
- Alloimmune thrombocytopenia is a fetal disorder caused by maternal-fetal platelet-antigen incompatibility.
- Diagnosis often follows neonatal thrombocytopenia discovery.
- Intracranial hemorrhage affects 10-20% of affected fetuses, with in utero onset in 25-50% of these cases.
Purpose of the Study:
- To investigate the correlates of thrombocytopenia in fetuses diagnosed with alloimmune thrombocytopenia.
- To compare in utero platelet counts with birth counts and sibling history.
- To identify predictors of thrombocytopenia severity.
Main Methods:
- Study included 107 fetuses with alloimmune thrombocytopenia (mean gestational age 25+/-4 weeks).
- Evaluations were performed before treatment initiation.
- Compared initial in utero platelet counts with birth counts and sibling's intracranial hemorrhage history.
Main Results:
- 50% of fetuses had initial platelet counts <=20,000/mm³.
- PI(A1) incompatibility was associated with more severe thrombocytopenia.
- Antenatal intracranial hemorrhage in a sibling predicted greater fetal thrombocytopenia severity.
Conclusions:
- Fetal alloimmune thrombocytopenia is an early-gestation, severe condition.
- Severity is increased in fetuses with an older sibling who experienced antenatal intracranial hemorrhage.
- Early detection and monitoring are crucial for managing this condition.