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|ADVERSE DRUG REACTION REPORT
|Year : 2015 | Volume
| Issue : 2 | Page : 109
A case of probable bemiparin-induced HIT type II managed with low-dose fondaparinux
T Koufakis, K Tsapakidis, A Margaritis, I Gabranis
Department of Internal Medicine, General Hospital of Larissa, Larissa, Greece
|Date of Web Publication||13-Mar-2015|
Department of Internal Medicine, General Hospital of Larissa, Larissa
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Koufakis T, Tsapakidis K, Margaritis A, Gabranis I. A case of probable bemiparin-induced HIT type II managed with low-dose fondaparinux. J Postgrad Med 2015;61:109
|How to cite this URL:|
Koufakis T, Tsapakidis K, Margaritis A, Gabranis I. A case of probable bemiparin-induced HIT type II managed with low-dose fondaparinux. J Postgrad Med [serial online] 2015 [cited 2019 Nov 17];61:109. Available from: http://www.jpgmonline.com/text.asp?2015/61/2/109/150451
Heparin-induced thrombocytopenia (HIT) type II is an immune-mediated, acquired, prothrombotic disorder that follows heparin therapy. A significantly lower HIT frequency has been observed in patients who take low-molecular-weight heparin (LMWH) compared to those receiving unfractionated heparin (UFH).  Bemiparin is a LMWH whose efficacy and safety in various clinical conditions has been established. 
We report the case of a 78-year-old woman, with a history of dementia, who presented to the Emergency Department of our hospital with complaints of abdominal pain. She had recently undergone a total hip arthroplasty, for which she had received bemiparin at a prophylactic dose (3500 IU, once a day). On Day 8 of bemiparin, her platelet count fell from 172.000/μL (pre bemiparin) to 45.000/μL and bemiparin was changed to fondaparinux (2.5 mg, once a day). She was subsequently discharged.
The patient's main clinical and laboratory findings at the Emergency Department were as following: diffuse pain during the abdomen's deep palpation, sites of skin necrosis [Figure 1], high serum LDH levels (1021 IU/L), thrombocytopenia (65.000/μL) and respiratory alkalosis from the arterial blood gas. A computed tomography (CT) angiography of chest and abdomen was performed which demonstrated a large pulmonary emboli at the right pulmonary artery, as well as thrombosis of the right common iliac and right common femoral veins. The patient's total 4T score for HIT was 8/8, while ELISA test and Serotonin Release Assay (SRA) for PF4-heparin antibodies proved to be strongly positive. The Naranjo algorithm, a method for estimating the probability of adverse drug reactions,  produced a score equal to 7, suggesting a probable association between bemiparin and HIT development. She was maintained on fondaparinux at prophylactic and not therapeutic doses (2.5 mg, once a day), considering the patient's low body mass index (approximately 20 kg/m 2 ) and the risk of bleeding complications. She was discharged 10 days later on fondaparinux and after a month, her platelet count was within the normal range. Fondaparinux was then replaced by acenocoumarol, with target INR of 2.5, for a time period of 3 months. In her follow-up visits she remained in good health and her blood tests were all within the normal range.
In conclusion, we here report an uncommon case of bemiparin-associated severe HIT type II. LMWHs are widely used anticoagulants and physicians should be aware of this extremely rare but potentially lethal adverse effect. Moreover, as already demonstrated by other studies,  fondaparinux can be an alternative, effective and safe agent for the treatment of HIT.
| :: References|| |
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Naranjo CA, Busto U, Sellers EM, Sandor P, Ruiz I, Roberts EA, et al. A method for estimating the probability of adverse drug reactions. Clin Pharmacol Ther 1981;30:239-45.
Warkentin TE, Pai M, Sheppard JI, Schulman S, Spyropoulos AC, Eikelboom JW. Fondaparinux treatment of acute heparin-induced thrombocytopenia confirmed by the serotonin-release assay: A 30-month, 16-patient case series. J Thromb Haemost 2011;9:2389-96
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