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Blood, 1 May 2006, Vol. 107, No. 9, pp. 3761-3763.
Prepublished online as a Blood First Edition Paper on January 10, 2006; DOI 10.1182/blood-2005-06-2235.
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Submitted June 3, 2005
Accepted December 28, 2005
Antigen-positive platelet transfusion in neonatal alloimmune thrombocytopenia (NAIT)
Volker Kiefel*, Dirk Bassler, Hartmut Kroll, Bosco Paes, Gunter Giers, Juliana Ditomasso, Heidemarie Alber, Monika Berns, Bea Wiebe, Ernst-Markus Quenzel, Jochen Hoch, and Andreas Greinacher
Department of Transfusion Medicine, University of Rostock, Rostock, Germany
Departments of Pediatrics (Neonatology Division), McMaster University, Hamilton, Ontario, Canada
German Red Cross Blood Transfusion Service, Dessau, Germany
Institute for Transfusion Medicine and Hemostaseology, University of Dusseldorf, Dusseldorf, Germany
Transfusion Medicine, McMaster University, Hamilton, Ontario, Canada
Institute for Transfusion Medicine, German Red Cross Blood Transfusion Service, Dresden, Germany
Department of Neonatology - Otto Heubner Centre, Charite Campus Virchow, Berlin, Germany
Department of Neonatology and Pediatric Intensive Care, Asklepios Clinic, St. Augustin, Germany
Department of Transfusion Medicine, Helios Clinic, Schwerin, Germany
Institute for Experimental Hematology and Transfusion Medicine, University of Bonn, Bonn, Germany
Institute for Immunology and Transfusion Medicine, University of Greifswald, Greifswald, Germany
* Corresponding author; email: volker.kiefel{at}med.uni-rostock.de.
Neonatal alloimmune thrombocytopenia (NAIT) is a fetomaternal incompatibility, most commonly induced by maternal anti-HPA-1a, IgG alloantibodies against a polymorphic epitope of the glycoprotein IIb/IIIa complex, in approximately 97.5% of Caucasians. Current guidelines recommend transfusion of immunologically compatible platelets to prevent cerebral hemorrhage, the most severe complication in affected newborns. Such platelet concentrates, however, are often not readily available. In a retrospective analysis in German and Canadian centres, twenty-seven newborns with NAIT were identified who received platelets from random donors. Unexpectedly, 24/27 newborns showed an increase above a threshold of 40 x 109 platelets/L, with moderate (n=8) or significant (n=16) platelet count increments ( > 80 x 109 platelets/L). We conclude that transfusion of platelet concentrates from random donors is an appropriate strategy in the management of unexpected, severe NAIT predominantly in first pregnancies, pending the availability of compatible platelets.

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