The thromboelastography G parameter as a potential biomarker of acute coronary syndrome.

The most prominent event that defines acute coronary syndrome (ACS) is the formation of an intra-arterial thrombus, usually resulting from activation of platelet and fibrinogen at the ruptured plaque. Usually, conventional coagulation tests (CCTs) are used to estimate the hemostatic properties of patients. However, CCTs have significant limitations because they each assess individual aspects of the coagulation cascade, which is a complex multifaceted process. And CCTs are performed with platelet-poor plasma, while the contribution of platelets to clot formation is not measured. In contrast, thromboelastography (TEG) is a test for global hemostasis with whole blood, from the beginning of coagulation through clot formation to the ending with fibrinolysis. The aim of this study was to investigate whether TEG parameters could be surrogate biomarkers of thrombus formation process and diagnosis of ACS. Receiver operating characteristic(ROC?curve was used to evaluate the diagnosis performance of each index. Logistic regression analysis was utilized to define the independent risk factors of ACS. The results showed that the shear elastic modulus parameter (G) was an independent diagnostic indicator for ACS (odds ratio [OR], 2.600; 95% confidence interval [CI], 2.035-3.322). The area under ROC curve of G was 0.866. The optimal cut-off value for the diagnosis of ACS was 10.55 dyne/cm(2), while the sensitivity was 66.2% and the specificity was 92.4%. In conclusion, G could be used as an optimal indicator of activation of platelet and fibrinogen, which is eligible to be a useful biomarker for early diagnosis of ACS.