Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis
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Blood Coagul. Fibrinolysis · Apr 2015
Comparative StudyDoes saline resuscitation affect mechanisms of coagulopathy in critically ill trauma patients? An exploratory analysis.
Metabolic acidosis has been implicated in the development of coagulopathy, although the specific mechanisms have not been well characterized. We sought to explore whether resuscitation of injured patients with a balanced crystalloid solution affects coagulation, as measured by endogenous thrombin potential (ETP) and thromboelastography (TEG). We performed an exploratory analysis of a subset of subjects enrolled in a randomized trial comparing the effect of resuscitation with isotonic saline versus Plasma-Lyte A (PLA) on acidosis and electrolyte abnormalities. ⋯ At 6 h, there were no differences in ETP parameters between groups; however, TEG results showed the time from initial clot formation to an amplitude of 20 mm (K) was shorter (3.8 ± 2.1 vs. 7.2 ± 2.8 s) and the rapidity of fibrin build-up and cross-linking (α angle) was significantly greater (41 ± 8 vs. 24 ± 15 deg) for the PLA group than in the isotonic saline group. Relative to PLA, isotonic saline does not alter thrombin generation, but isotonic saline and PLA may differentially impact clotting factor availability. The shorter time to reach prespecified clot amplitude and the increased rate of fibrin generation imply faster amplification of clotting factors with PLA without effect on latency time or clot strength.
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Blood Coagul. Fibrinolysis · Apr 2015
Experimental model of hyperfibrinolysis designed for rotational thromboelastometry in children with congenital heart disease.
We assessed an in-vitro model of hyperfibrinolysis using rotational thromboelastometry (ROTEM) by the addition of increasing concentrations of tissue-type plasminogen activator (t-PA) on whole blood obtained from children undergoing cardiac surgery. We assessed the relevance of this model by repeating the tests in the same population after tranexamic acid (TXA) infusion. In addition, we determined the sensitivity and specificity of ROTEM parameters to detect the different degrees of fibrinolysis. ⋯ Lysis-onset time (LOT) and degree of fibrinolysis measured at 30 min (LI30) best assessed the degree of fibrinolysis. This in-vitro model of t-PA-induced hyperfibrinolysis using the EXTEM test of ROTEM may represent a promising tool to assess hyperfibrinolysis in the pediatric population. In addition, we observed that LOT and LI30 should be considered as the best parameters to detect different degrees of fibrinolysis.
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Blood Coagul. Fibrinolysis · Apr 2015
Roles of the red cell distribution width and neutrophil/lymphocyte ratio in predicting thrombolysis failure in patients with an ST-segment elevation myocardial infarction.
Red cell distribution width (RDW) and the neutrophil/lymphocyte ratio (NLR) are predictors of cardiovascular risk that have been shown to correlate with impaired reperfusion and increased morbidity and mortality in patients with an ST-segment elevation myocardial infarction (STEMI). We hypothesized that RDW and the NLR would be associated with failed thrombolysis. One hundred and two STEMI patients were included in the study; 32 had failed thrombolysis while the other 70 fulfilled the criteria for successful thrombolysis. ⋯ In addition, the prevalence of failed thrombolysis was significantly higher in patients with an RDW more than 14.3 fl than in those with an RDW of 14.3 fl or less (51.8 and 6.5%, respectively, P < 0.001 by multivariate analysis). The NLR was significantly higher in patients with an RDW more than 14.3 fl than in those with an RDW 14.3 fl or less (4 ± 2.5 and 2.8 ± 1.5, respectively, P = 0.007). RDW and the NLR may be used as adjunctive readily available factors for assessment of thrombolysis outcome upon admission.