Perioperative Use of Tranexamic (TXA) in Bone Tumor Surgery Will Change in Blood Loss and Transfusion Requirements.

Perioperative Use of Tranexamic (TXA) in Bone Tumor Surgery Will Change in Blood Loss and Transfusion Requirements.

Does Perioperative Use of Tranexamic (TXA) in Bone Tumor Surgery Reduce Blood Loss and Transfusion Requirements? A Double-blinded Randomized Controlled Trial

The purpose of this trial is to investigate whether previously reported benefit of Tranexamic acid in pediatric orthopedic surgeries could be recapitulated in bone tumor surgeries or not through a double blinded randomized controlled trial done in children cancer hospital 57357.

Resection of bone tumors is commonly associated with considerable intra and post-operative blood loss due to extensive soft tissue dissection, multiple bone osteotomies, prolonged operative time. The intraoperative use of limb tourniquet to reduce bleeding may not be applicable in all situations e.g. arm, thigh and pelvic surgeries. The use of cell savers for auto transplantation of blood is not preferred in cancer surgeries. Antifibrinolytic drug are currently used to reduce perioperative blood loss in a variety of orthopedic surgeries. Currently, the most common agents used are EACA and TXA. A third agent, aprotinin, was withdrawn from the market in 2007 owing to safety concerns noted in several studies, suggesting an increased risk of death and renal dysfunction in patients undergoing cardiac surgery. Slow to adopt in obstetric population, TXA became popular for patients with hereditary bleeding disorders for whom menorrhagia, frequent spontaneous nose bleeds, or dental procedures could be life threatening. With strong record as an effective and safe medicine, TXA has earned its place on the World Health Organization List of Essential Medicines as an important drug needed in every health system. More recently, its use has expanded to treat or prevent excessive blood loss from trauma and major surgery, including cardiac, orthopedic, and hepatic procedures. TXA, a lysine analogue, reversibly binds to the plasminogen lysine receptors and thereby blocks plasminogen from binding to fibrin (tPA can only activate fibrin-bound plasminogen and produce plasmin responsible for cleaving fibrin molecule and dissolving the blood clot) TXA has been extensively studied in joint replacement surgeries specifically total knee replacement, scoliosis surgery, and in trauma surgeries. The question of efficacy of TXA in these surgeries was addressed in multiple prospective randomized studies and subsequent meta-analysis. Main concern regarding increased risk of DVT was negated in several of these studies. The American Academy of Orthopedic Surgeons provides a strong recommendation for the use of any administration of TXA for joint arthroplasty and states that it does not seem to increase the risk of thromboembolic or myocardial complications. Junlong Zhong et al. in 2019 published a systematic review and meta-analyses on 2500 pediatric patients undergoing corrective surgery for idiopathic scoliosis. They concluded that TXA was effective in reducing surgical time, intraoperative blood loss and blood transfusion without increasing complications. Levack et al. Published in 2020 a randomized controlled trial on role of TXA in reducing blood loss and transfusion in pediatric patients undergoing a periacetabular osteotomy. They concluded that TXA reduced blood loss by 293ml and reduced frequency of allogenic transfusions by 73%. The purpose of this trial is to investigate whether previously reported benefit of Tranexamic acid in pediatric orthopedic surgeries could be recapitulated in bone tumor surgeries or not through a double blinded randomized controlled trial done in children cancer hospital 57357.

A prospective, randomized, double-blinded clinical trial will be done on all included case. They will be divided into two groups based randomly using Block Stratified Randomized Software program, after obtaining informed consent from eligible patient or his caregiver into two Arms: Arm A: patient is not receiving TXA but instead receiving a placebo (saline injection) Arm B: patient is receiving TXA which is colorless solution.

The PI, primary surgeon, anesthesiologist, patient, all assisting surgeons and anesthesiologist as well operating and circulating nurse will be blinded to the study arm to which patient belongs to. Only clinical trial unit and pharmacist will be unblinded.

Loading dose: Prior to surgical incision, and according to allocated arm, pharmacist will prepare TXA injection at a dose of 10mg/kg diluted in 50ml normal saline (maximum concentration 100mg/ml). Maintenance dose: Throughout surgery, continuous infusion at a dose of 5mg/kg/hour will be given until wound closure.

Loading dose: Prior to surgical incision, and according to allocated arm, pharmacist will prepare 50 ml of 0.9% saline or TXA at a dose of 10mg/kg diluted in 50ml normal saline (maximum concentration 100mg/ml). Maintenance dose: Throughout surgery, continuous infusion of saline will be given until wound closure.

. TXA, a lysine analogue, reversibly binds to the plasminogen lysine receptors and thereby blocks plasminogen from binding to fibrin (tPA can only activate fibrin-bound plasminogen and produce plasmin responsible for cleaving fibrin molecule and dissolving the blood clot)

will be calculated based on measurement of number and weights of blood-soaked surgical swabs. As well as measurement of total volume of blood collected in suction container, after subtracting volume of saline used for washing wound.

will be calculated based on measurement of number and weights of blood-soaked surgical swabs. As well as measurement of total volume of blood collected in suction container, after subtracting volume of saline used for washing wound.

Calculation of blood volume to be transfused (no of units in mls) = (Estimated blood volume ×(target HCT -actual HCT))/HCT of one unit of packed RBCs

Inclusion Criteria: Malignant bone tumor of the femur and finished neoadjuvant chemotherapy Candidate for resection and reconstruction by prosthesis. 3- Age 4-18 years. Exclusion Criteria: Anatomic location other than femur de Reconstruction other than prosthesis Allergy to TXA Previous history of DVT Previous history of renal dysfunction Congenital or acquired coagulopathy. Congenital or acquired cardiomyopathy. Previous history of convulsions.

Levack AE, McLawhorn AS, Dodwell E, DelPizzo K, Nguyen J, Sink E. Intravenous tranexamic acid reduces blood loss and transfusion requirements after periacetabular osteotomy. Bone Joint J. 2020 Sep;102-B(9):1151-1157. doi: 10.1302/0301-620X.102B9.BJJ-2019-1777.R1.

Dadure C, Sauter M, Bringuier S, Bigorre M, Raux O, Rochette A, Canaud N, Capdevila X. Intraoperative tranexamic acid reduces blood transfusion in children undergoing craniosynostosis surgery: a randomized double-blind study. Anesthesiology. 2011 Apr;114(4):856-61. doi: 10.1097/ALN.0b013e318210f9e3.

Carabini LM, Moreland NC, Vealey RJ, Bebawy JF, Koski TR, Koht A, Gupta DK, Avram MJ; Northwestern High Risk Spine Group. A Randomized Controlled Trial of Low-Dose Tranexamic Acid versus Placebo to Reduce Red Blood Cell Transfusion During Complex Multilevel Spine Fusion Surgery. World Neurosurg. 2018 Feb;110:e572-e579. doi: 10.1016/j.wneu.2017.11.070. Epub 2017 Nov 22.

Johnson DJ, Johnson CC, Goobie SM, Nami N, Wetzler JA, Sponseller PD, Frank SM. High-dose Versus Low-dose Tranexamic Acid to Reduce Transfusion Requirements in Pediatric Scoliosis Surgery. J Pediatr Orthop. 2017 Dec;37(8):e552-e557. doi: 10.1097/BPO.0000000000000820.