The effect of tranexamic acid on blood transfusion in lower gastrointestinal bleeding-A double blind prospective randomised controlled trial.

ABSTRACT

PURPOSE: Acute gastrointestinal bleeding is a common emergency. Tranexamic acid (TXA) reduces clot breakdown by inhibiting the action of plasmin and has been shown to reduce the need for blood transfusion in trauma, surgical procedures, and upper gastrointestinal bleeding. This study examined the efficiency of intravenous TXA in patients with acute lower gastrointestinal bleeding. METHODS: Eighty-one patients aged >18 years with lower GI hemorrhage, presenting as active rectal bleeding and anemia (hemoglobin lower than 11 g/dL or a decrease of 2 gr/dl from the patient's base level), were enrolled in this single center, double blind prospective research. Patients were randomly assigned to receive intravenous TXA or placebo from admission until colonoscopy took place. The need for transfusion of packed red blood cells (PRBC) and number of units was recorded and compared between the two groups. RESULTS: Eighty-one patients were randomized in this study, thirty-nine in the TXA arm, and forty-two in the placebo arm. Patient characteristics did not differ between the groups. Forty-three out of the 81 patients received blood transfusion; twenty-two were on the placebo arm and twenty-one on the TXA arm (p = 0.89). Twenty-nine patients required 2 or more units, 14 in the TXA arm and 15 in the placebo arm (p = 0.98). CONCLUSIONS: Intravenous TXA has no significant effect on blood requirement in patients with lower GI bleeding. There was no difference in the consumption of PRBC units among the patients in the placebo and TXA groups. It seems that tranexamic acid has no significant effect on transfusion of PRBC units in lower GI bleeding.