We carried out a placebo-controlled, double-blind, randomized study of the hemostatic effect of tranexamic acid mouthwash after oral surgery in 39 patients receiving anticoagulant agents because of the presence of cardiac valvular stenosis, a prosthetic cardiac valve, or a vascular prosthesis. Surgery was performed with no change in the level of anticoagulant therapy, and treatment with the anticoagulant agent was continued after surgery. Before it was sutured, the operative field was irrigated in 19 patients with 10 ml of a 4.8 percent aqueous solution of tranexamic acid (an inhibitor of fibrinolysis) and in 20 patients with a placebo solution. For seven days thereafter, patients were instructed to rinse their mouths with 10 ml of the assigned solution for two minutes four times a day. There were no significant differences between the two treatment groups in base-line variables, including the level of anticoagulation at the time of surgery. Eight patients in the placebo group had a total of 10 postoperative bleeding episodes, whereas only 1 patient in the tranexamic acid group had a bleeding episode (P = 0.01). There were no systemic side effects. We conclude that local antifibrinolytic therapy is effective in preventing bleeding after oral surgery in patients who are being treated with anticoagulants.
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Department of Oral and Maxillofacial Surgery, Aarhus University Hospital, Denmark.
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