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• W2017788128 abstract "Background Hyperfibrinolysis plays an integral role in the genesis of trauma-induced coagulopathy. Recent data demonstrate that red blood cell lysis promotes fibrinolysis; however, the mechanism is unclear. Hemoglobin-based oxygen carriers (HBOCs) have been developed for resuscitation and have been associated with coagulopathy. We hypothesize that replacement of whole blood (WB) using an HBOC results in a coagulopathy because of the presence of free hemoglobin. Materials and Methods WB was sampled from healthy donors (n = 6). The clotting profile of each citrated sample was evaluated using native thromboelastography. Serial titrations were performed using both HBOC (PolyHeme) and normal saline (NS; 5%, 25%, and 50%) and evaluated both with and without a 75-ng/mL tissue plasminogen activator (tPA) challenge. Tranexamic acid (TXA) was added to inhibit plasmin-dependent fibrinolysis. Fibrinolysis was measured and recorded as lysis at 30 min (LY30), the percentage of clot LY30 after maximal clot strength. Dilution of WB with NS or HBOC was correlated using LY30 via Spearman rho coefficients. Groups were also compared using a Friedman test and post hoc analysis with a Bonferroni adjustment. Results tPA-provoked fibrinolysis was enhanced by both HBOC (median LY30 at 5%, 25%, and 50% titrations: 11%, 21%, and 44%, respectively; Spearman = 0.94; P < 0.001) and NS (11%, 28%, and 58%, respectively; Spearman = 0.790; P < 0.001). However, HBOC also enhanced fibrinolysis without the addition of tPA (1%, 4%, 5%; Spearman = 0.735; P = 0.001) and NS did not (1%, 2%, 1%; r = 0.300; P = 0.186. Moreover, addition of TXA did not alter or inhibit this fibrinolysis (WB versus 50% HBOC: 1.8% versus 5.7%, P = 0.04). There was no significant difference in fibrinolysis of HBOC with or without TXA (50% HBOC versus 50% HBOC + TXA: 5.6% versus 5.7%, P = 0.92). In addition, the increased fibrinolysis seen with NS was reversed when TXA was present (WB versus 50% NS: 1.8% versus 1.7%, P = 1.0). Conclusions HBOCs enhance fibrinolysis both with and without addition of tPA; moreover, this mechanism is independent of plasmin as the phenomenon persists in the presence of TXA. Our findings indicate the hemoglobin molecule or its components stimulate fibrinolysis by both tPA-dependent and innate mechanisms." @default.
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• W2017788128 date "2017-06-01" @default.
• W2017788128 modified "2023-10-06" @default.
• W2017788128 title "Hemoglobin-based oxygen carriers promote systemic hyperfibrinolysis that is both dependent and independent of plasmin" @default.
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• W2017788128 doi "https://doi.org/10.1016/j.jss.2015.04.077" @default.
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