PMID- 35140192 OWN - NLM STAT- MEDLINE DCOM- 20220211 LR - 20220211 IS - 1473-5733 (Electronic) IS - 0957-5235 (Linking) VI - 33 IP - 2 DP - 2022 Mar 1 TI - A challenging case of heparin-induced skin necrosis without thrombocytopenia. PG - 134-137 LID - 10.1097/MBC.0000000000001112 [doi] AB - Heparin-induced skin necrosis (HISN) is a rare complication of heparin anticoagulation. The condition occurs in various situations, including in heparin-naive and exposed individuals, in areas local or distant from the heparin injection site, and with or without frank thrombocytopenia. We present a case in which a patient treated for a pulmonary embolism with therapeutic unfractionated heparin (UFH) develops this adverse event. Symptoms were reversed with cessation of UFH and transition to bivalirudin without surgical debridement. The patient initially had anti-PF4 antibodies present but subsequent testing showed borderline antibodies and a negative serotonin release assay. After starting bivalirudin, the patient was later switched to fondaparinux without further consequences. This case illustrates the pathogenesis of HISN and provides an example of inconsistently abnormal laboratory values. Additionally, it provides two novel exposures the mRNA-1273 vaccine and the immune checkpoint inhibitor pembrolizumab that, to our knowledge, have not been previously reported. CI - Copyright (c) 2022 Wolters Kluwer Health, Inc. All rights reserved. FAU - Chidharla, Anusha AU - Chidharla A AD - Department of Internal Medicine, University of Illinois College of Medicine at Peoria. AD - Department of Medical Oncology, Kansas university Cancer center, Kansas, KS, USA. FAU - Rapoport, Eliot A AU - Rapoport EA AD - Department of Internal Medicine, University of Illinois College of Medicine at Peoria. FAU - Naffakh, Noor AU - Naffakh N AD - Department of Clinical Pharmacy, OSF Healthcare Saint Francis Medical Center. FAU - Roberts, Jonathan C AU - Roberts JC AD - Department of Internal Medicine, University of Illinois College of Medicine at Peoria. AD - Bleeding & Clotting Disorders Institute, Peoria, Illinois, USA. LA - eng PT - Case Reports PT - Journal Article PL - England TA - Blood Coagul Fibrinolysis JT - Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis JID - 9102551 RN - 0 (Anticoagulants) RN - 9005-49-6 (Heparin) RN - EPK39PL4R4 (2019-nCoV Vaccine mRNA-1273) SB - IM MH - 2019-nCoV Vaccine mRNA-1273 MH - Anticoagulants/adverse effects MH - *Heparin/adverse effects MH - Humans MH - Necrosis/chemically induced MH - *Thrombocytopenia/chemically induced EDAT- 2022/02/11 06:00 MHDA- 2022/02/12 06:00 CRDT- 2022/02/10 05:31 PHST- 2022/02/10 05:31 [entrez] PHST- 2022/02/11 06:00 [pubmed] PHST- 2022/02/12 06:00 [medline] AID - 00001721-202203000-00008 [pii] AID - 10.1097/MBC.0000000000001112 [doi] PST - ppublish SO - Blood Coagul Fibrinolysis. 2022 Mar 1;33(2):134-137. doi: 10.1097/MBC.0000000000001112.