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Background  Tranexamic acid (TXA) is widely used to reduce blood loss and transfusion rates in total hip arthroplasty(THA). Thromboelastography, which can monitor coagulation changes from clotting to fibrinolysis dynamically. In this study, thromboelastography was used to assess the dynamic changes in the coagulation of patients who underwent THA with the administration of TXA.    Methods  This randomized controlled trial consisted of 207 consecutive patients who underwent primary total hip arthroplasty. Patients were randomized into three groups: topical-TXA group received a topical application of TXA, IV-TXA group received an intravenous injection of TXA, and control group. Thromboelastography was performed 1 day before surgery and first, fourth, seventh days after surgery. The primary outcomes were thromboelastography parameters, the rates of deep vein thrombosis(DVT), and pulmonary embolism(PE). Secondary outcomes included perioperative blood loss, transfusion rates, and other perioperative complications.    Results  The mean calculated total blood loss in the Topical-TXA group were 832.7 ± 279.84 ml and 834.8 ± 322.94 ml in the IV-TXA group, which were significantly reduced ( p  < 0.05) compared with control groups at 1093.3 ± 379.7 ml. There were no significant differences between topical-TXA and IV-TXA groups in total blood loss or transfusion rates.  K  and  R  have reached a nadir from preoperative levels to 4th day postoperatively and then began to increase.α angle and CI peaked from preoperative levels to the fourth day postoperatively and then began to decline.IV-TXA significantly ( p  < 0.05) promoted coagulation levels compared with topical-TXA and control groups in the early postoperative period. Almost no significant differences were observed between topical-TXA and control groups in thromboelastography parameters.No significant differences were observed in the incidence of thromboembolic complications and other perioperative complications.    Conclusions  The topical administration of TXA had the same hemostatic effect as intravenous injection tranexamic acid. Coagulation function peaked on 4th day postoperatively and then began to decline. IV-TXA was more enhanced coagulation functions compared with topical-TXA.

journal of orthopaedic surgery and research

Application of thromboelastography to evaluate the effect of different routes administration of tranexamic acid on coagulation function in total hip arthroplasty