Abstract：
BACKGROUND:Heparin binding to platelet factor 4 (PF4) generates a new antigenic epitope. In an unpredictable fashion, as many as approximately 17% of patients treated with unfractionated heparin (UFH) and approximately 8% treated with low-molecular-weight heparin (LMWH) subsequently develop the anti-heparin-PF4 antibodies that mediate heparin-induced thrombocytopenia and thrombosis (HIT). Very few of those patients with circulating anti-heparin-PF4 antibodies, however, progress to develop clinical HIT (referred to previously as Type II HIT). Only 20% of those who harbor antibodies ( approximately 3% of those exposed to heparin) will manifest the thrombocytopenia subsequently. Even fewer patients (0.03% to 0.09% of those exposed to heparin) experience the marked platelet activation and morbid thromboses characteristic of the HIT syndrome. The pathogenesis of heparin-induced thrombocytopenia (HIT) remains elusive. The pathophysiologic understanding to date has revolved around pathogenic anti-heparin-PF4 antibodies that trigger platelet activation, release of platelet procoagulant microparticles, and resultant thrombosis. The clinical diagnosis of HIT is confusing because current assays to detect anti-heparin-PF4 antibodies do not correlate well with the disease. Currently available assays lack either adequate sensitivity and interlaboratory reproducibility (ie, functional serotonin release assays) or specificity (ie, enzyme-linked immunosorbent assays or ELISAs). CONCLUSIONS:Fortunately, the treatment for HIT is not confusing. The purposes of this review are as follows: (1) to examine the relevant clinical definition of HIT, (2) to explore our current understanding as to the pathogenesis of HIT, and (3) to present an algorithm for the identification and treatment of the HIT syndrome.
journal_name
Surgeryjournal_title
Surgeryauthors
Baldwin ZK,Spitzer AL,Ng VL,Harken AHdoi
10.1016/j.surg.2007.09.036subject
Has Abstractpub_date
2008-03-01 00:00:00pages
305-12issue
3eissn
0039-6060issn
1532-7361pii
S0039-6060(07)00633-2journal_volume
143pub_type
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