Journal
ANNALS OF EMERGENCY MEDICINE
Volume 45, Issue 4, Pages 417-419Publisher
MOSBY, INC
DOI: 10.1016/j.annemergmed.2004.08.005
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Delayed-onset heparin-induced thrombocytopenia is a syndrome in which thrombocytopenia and thrombosis begin several days after heparin discontinuation. Delayed-onset heparin-induced thrombocytopenia is caused by immunoglobulin G antibodies that are reactive against the heparin-platelet factor 4 complex in the absence of circulating heparin. We describe 2 patients with delayed-onset heparin-induced thrombocytopenia who presented to the emergency department. An 88-year-old man and a 62-year-old man experienced thrombocytopenia and thrombosis 9 or more days after heparin cessation and demonstrated a further decrease in platelet count on reexposure to heparin. Delayed-onset heparin-induced thrombocytopenia should be included in the differential diagnosis of a patient with recent heparin exposure who presents with thrombosis or thrombocytopenia.
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