Comparison of the Effects of Intravenous and Oral Tranexamic Acid on Perioperative Hemoglobin Levels During Total Knee Arthroplasty.

Tranexamic acid (TXA) is an antifibrinolytic agent shown to reduce perioperative blood loss in patients undergoing total knee arthroplasty (TKA), but there are limited data regarding the efficacy of intravenous (IV) in comparison to oral (PO) TXA. The purpose of this research was to compare the effects of IV and PO TXA on perioperative hemoglobin (Hgb) levels in patients who have undergone TKA. In this single-center, retrospective chart review, patients at least 18 years of age who received IV or PO TXA following medical center protocol from 1 of 3 orthopedic surgeons were included. The primary outcome was the change in Hgb within 24 hours following TKA. Secondary outcomes included comparisons of postsurgical complications and hospital length of stay. The IV TXA group contained 62 participants, and the PO TXA group contained 61 participants. Patients receiving PO therapy had a larger decrease in Hgb compared with the IV TXA group (-2.382 vs -1.908, = 0.02), but there were no statistically significant differences in mean length of stay (3.13 vs 2.95, = 0.27), venous thromboembolism (VTE) occurrence (0 vs 0, = 1), or requirement for transfusions (6 vs 5, = 0.76). IV and PO TXA may not be equivalent in outcomes for patients undergoing TKA. This study found a statistically significant decrease in the mean change of Hgb in patients receiving PO TXA compared with IV TXA. However, the rate of transfusions, mean length of stay, and rate of VTE were similar between groups.