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- W2168741901 abstract "<h2>Abstract</h2><h3>Introduction</h3> In patients undergoing cardiac surgery with heart-lung machine support, adequate anticoagulation to mitigate blood clotting caused by the artificial surfaces of the extracorporeal circulation (ECC) system is essential. These patients routinely receive heparin, whose effectiveness is monitored by measurements of the activated clotting time (ACT). However, ACT values only poorly correlate with the actual hemostatic status. The aim of our study was to evaluate the detection of free thrombin in heparinized human blood as a monitor of anticoagulation during ECC. <h3>Materials and Methods</h3> Human whole blood was anticoagulated with different concentrations of heparin (0.75, 1, 2 or 3IU/ml) and circulated in the Chandler-loop model for up to 240min at 37°C. Next to ACT, ECC-mediated changes in free active thrombin, prothrombin fragment 1+2 (F1+2) and thrombin-antithrombin-III (TAT) levels were measured before and during circulation. Platelet activation and cell count parameters were further investigated. <h3>Results</h3> Our study shows that detection of ECC-mediated changes in free thrombin is possible in blood anticoagulated with 0.75 or 1IU/ml heparin, whereas no thrombin was detectable at higher heparin concentrations. Thrombin generation during 240min of ECC is comparable to F 1+2 and TAT plasma levels during ECC. <h3>Conclusions</h3> Thrombin is the key enzyme in the coagulation cascade and hence represents a promising marker for monitoring the coagulation status of patients. Although detection of free thrombin was not feasible at high heparin concentrations, the employed test represents an additional test to current laboratory methods investigating blood coagulation at low heparin concentrations." @default.
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- W2168741901 date "2014-03-01" @default.
- W2168741901 modified "2023-10-03" @default.
- W2168741901 title "Real-time measurement of free thrombin: Evaluation of the usability of a new thrombin assay for coagulation monitoring during extracorporeal circulation" @default.
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- W2168741901 doi "https://doi.org/10.1016/j.thromres.2013.12.007" @default.
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