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• W2006117584 abstract "Background Heparin use in surgical patients places them at increased risk for developing heparin-induced thrombocytopenia (HIT). The false positive rate of HIT using the current standard criteria is unknown in surgical ICU patients, who often have confounding factors that cause thrombocytopenia. Study Design Surgical ICU patients, admitted over a 2-year period with a positive screening test for HIT (platelet factor [PF] 4 ≥ 0.4 optical density [OD]), were reviewed retrospectively at a single institution. Correlation of the Warkentin 4-T score and commercial heparin PF4 ELISA with serotonin releasing assay (SRA) was performed. Logistic regression was used to determine independent risk factors associated with the development of HIT. Results PF4 tests were requested in 643 patients based on a clinical suspicion of HIT. Of these, 104 patients had a PF4 result, an SRA value (%), and a 4-T score available. Twenty patients (19%) had true positive HIT, defined as a positive PF4 and positive SRA (SRA ≥ 20%). Eighty-four patients (81%) were false positive, defined as a positive PF4 and negative SRA. Five of 58 patients with Warkentin score of 0 to 3, and 6 of 14 patients with Warkentin score of 6 to 8 were HIT positive by SRA. Conclusions In surgical ICU patients, clinical suspicion for HIT necessitates PF4 and SRA analysis. Testing for HIT or treatment with a direct thrombin inhibitor should not depend on the Warkentin 4-T score alone. Although a PF4 ≥ 0.4 OD is considered a positive screening test for HIT, a PF4 ≥ 2.0 OD is preferable in surgical ICU patients." @default.
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• W2006117584 date "2011-07-01" @default.
• W2006117584 modified "2023-09-24" @default.
• W2006117584 title "Overdiagnosis of Heparin-Induced Thrombocytopenia in Surgical ICU Patients" @default.
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• W2006117584 doi "https://doi.org/10.1016/j.jamcollsurg.2011.04.002" @default.
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