TY - BOOK AU - Cruz, Allan L AU - DeStefano, Christin B AU - Doucette, Kimberley AU - Fitzpatrick, Kelly AU - Jain, Natasha A AU - Malkovska, Vera TI - Treatment of refractory delayed onset heparin-induced thrombocytopenia after thoracic endovascular aortic repair with intravenous immunoglobulin (IVIG) SN - 2475-0379 PY - 2017/// KW - MedStar Washington Hospital Center KW - Hematology/Oncology KW - Medicine/Internal Medicine KW - Case Reports N2 - Delayed onset heparin induced thrombocytopenia (HIT), is characterized by a late nadir due to persistent platelet-activating IgG antibodies. It typically begins or worsens 5 or more days after heparin is discontinued with complications such as thrombosis up to 3 weeks after exposure to heparin.1-3 In 50% of cases, the platelet count can decrease to very low numbers (<20 000/muL), which is not usual for typical HIT. Here we report 2 cases of post-operative delayed onset HIT manifesting as severe thrombocytopenia that persisted despite cessation of heparin and initiation of argatroban. Key Clinical Question: Is intravenous immunoglulin beneficial in severe refractory delayed-onset HIT? UR - https://dx.doi.org/10.1002/rth2.12009 ER -