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Djunić, Irena; Tomin, Dragica; Antonijević, Nebojsa; Gradinac, Sinisa; Kovac, Mirjana; Vidović, Ana; Djurasinović, Vladislava; Elezović, Ivo
Srpski arhiv za celokupno lekarstvo, 09/2009, Letnik: 137, Številka: 9-10Journal Article
Heparin-induced thrombocytopenia (HIT) is an acquired, prothrombotic disorder, caused by antibodies to a complex of heparin and platelet factor 4 (PF4) that activates platelets, resulting in the release of procoagulant microparticles, thrombocytopenia occurrence, generation of thrombin, and frequent thromboses. We present a case of severe HIT in a 68-year-old female, which occurred after cardiosurgery of the left atrial myxoma with the aim to point out the importance of differential diagnosis of thrombocytopenia in patients recently exposed to heparin. Platelet count dropped on the eleventh postoperative day, six days after unfractioned heparin and enoxaparine threatment, to 4x10(9)/I.The correct diagnosis failed to be made at first. Since thrombocytopenia remained refractory to a corticosteroid treatment and platelet transfusion, the patient was hospitalized on the 13th postoperative day at the Institute of Haematology. The diagnosis of HIT was confirmed with the high-probability clinical score (4T's) and strongly positive anti-heparin-PF4 (PaGIA) test as well as positive platelet aggregation test. The treatment started with a smaller therapeutic doses of danaparoid than recommended of 750 U intravenous bolus and was followed by continuous infusions of 100 U per 1 h and intravenous gammaglobulins in full dosage for four days. The platelet count started to rise on the third day and it was completely normalized on the 5th day of the therapy. Treatment of severe HIT with small doses of danaparoid supplemented by intravenous gamma globulin was successful. Additional awareness of heparin-induced thrombocytopenia is needed, especially of HIT in differential diagnosis of thrombocytopenia in patients recently exposed to heparin.
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