The Efficacy and Population Pharmacokinetics of Tranexamic Acid for Craniosynostosis Surgery

The Efficacy and Population Pharmacokinetics/ Pharmacogenomics of a Reduced Dose of Tranexamic Acid for Craniosynostosis Surgery

This research study is being performed to evaluate two different doses of Tranexamic acid (TXA) in children who have craniosynostosis and have been referred to Boston Children's Hospital for corrective surgery. This surgery is associated with significant blood loss and frequently requires the transfusion of blood. TXA is a medication that reduces the amount of bleeding during surgery by improving clotting of the blood at the surgical site. TXA is an FDA-approved drug that is routinely used in infants and children undergoing major surgery including heart surgery, craniofacial surgery and scoliosis surgery. It has been shown to decrease both the amount of bleeding and the amount of blood transfusion needed. We would like to compare the different doses of TXA to see if a lower dose has the same effect on blood loss as a higher dose. We are also interested to learn why TXA seems to work better in some patients than in others. In order to study the effect of this drug we would like to give this drug to your child and measure the blood loss and the volume of blood given to your child during his/her surgery.

The research is being done at two sites; Boston Children's Hospital and Gaslini Children's Hospital in Genoa, Italy. The main study doctor from Boston Children's Hospital is Dr. Susan Goobie. The Department of Anesthesiology at Boston Children's Hospital is sponsoring this study.

We are planning to study a total of 68 infants and children from age 3 months to 6 years old scheduled for open craniosynostosis surgery at Boston Children's Hospital or Gaslini Children's Hospital.

Study Overview

• Status: Completed
• Conditions: Craniosynostosis
• Intervention / Treatment: Drug: high dose TXA; Drug: Low dose TXA

Detailed Description

Introduction: Over 90% of open craniosynostosis surgical procedures are associated with a transfusion of blood or blood products. Goobie et. al. recently showed that tranexamic acid in a dose of 50 mg/kg/15min and 5 mg/kg/h significantly reduced blood loss and transfusion requirements as well as the overall exposure of children to donor PRBC by two thirds. However, using a moderately high dosing regimen, TXA plasma concentrations were shown to far exceed the accepted therapeutic level (by over 10 fold). No side effects of TXA were found in this study but a recent study suggests that currently recommended high to moderate TXA dosing regimens are potentially associated with neurological complications in children. Goobie et. al. developed a population pharmacokinetic model of TXA and simulated a dose response curve for this population. From this model and simulation, it appears that reducing the loading dose to 10 mg/kg/15 min followed by a 5 mg/kg/h infusion is adequate to maintain plasma concentrations above the accepted therapeutic level of 20ug/mL.

It is important to test and validate this reduced dosage scheme in a multicenter study. The hypothesis is that this reduced dosage scheme (10 mg/kg loading dose and 5 ug/kg/h) is as effective as the higher dosage scheme (50 mg/kg loading dose and 5 mg/kg/h) in decreasing blood loss and transfusion requirements in children undergoing open craniosynostosis surgery. Thus the PK/PD profile of TXA in craniosynostosis patients will be determined with genomics explored as a cause of interpatient variability in the response to tranexamic acid.

Experimental Design: With IRB approval and informed consent 68 pediatric patients aged 3 m to 6 years coming for open craniofacial surgery will be randomized in a prospective double blind fashion to either the current standard intravenous TXA dose (50mg/kg/15min and 5 mg/kg/h) or this lower TXA dose (10 mg/kg/15min and 5 mg/kg/h) until the end of surgery. A standardized anesthetic and well defined fluid, blood and blood product management protocols will be followed with improved modifications from the previously described protocol.

Data Analysis Plan: A preliminary power analysis indicated that a total sample size of 56 children (28 in randomized each group) would provide 80% statistical power to test whether the difference in average blood loss is equivalent to within 25% (ie 15 cc/kg) assuming a standard deviation of 30% ie +/- 22 ml/kg (moderate effect size = 0.68) . We plan to randomize 68 patients; 34 per group to ensure that we meet our sample size requirements while accounting for a potential 20% patient drop out.

Specific Aims:

1. Determine the efficacy of TXA (PD) in infants and children undergoing open craniofacial surgery with this lower dosage scheme.
2. Determine the population pharmacokinetics (PK) of TXA in infants and children undergoing open craniofacial surgery with this dosage scheme.
3. Determine the influence of genetics on response to TXA.
4. Attempt to better define efficacy of TXA in a direct manner using a novel and innovative approach by obtaining pre and post biological markers of fibrinolysis (as bleeding and blood loss are difficult to measure accurately and are an indirect measure of TXA efficacy of inhibition of fibrinolysis.

• Study Type: Interventional
• Enrollment (Actual): 66
• Phase: Phase 4

Contacts and Locations

Study Locations

• United States
  • Massachusetts
    • Boston, Massachusetts, United States, 02115
      • Boston Children's Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 3 months to 6 years (Child)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Patients (age range 3 months to 6 years) undergoing craniosynostosis repair, fronto-orbital advancement surgery and cranial remodeling surgery (i.e. total cavernal remodeling surgery).

Exclusion Criteria:

• Preexisting hematological abnormality (defined as a positive history of bleeding disorder or a known diagnosis of a genetic or acquired bleeding disorder)
• Preexisting coagulation defect (defined as PT, PTT or INR >1.5 times normal or a n pre-existing genetic or acquired coagulation defect))
• Preexisting hepatic, renal, vascular, ocular and/or metabolic disorder
• History of acetylsalicylate ingestion within the last 14 days.
• History of NSAIDs ingestion with 2 days of the scheduled surgery date

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: high dose TXA; High dose TXA is the intervention. A higher dose of tranexamic acid will be given to this arm as follows: 50 mg/kg loading dose and 5 mg/kg/h infusion	Drug: high dose TXA; Other Names: Tranexamic acid, Cyclokapron; Craniofacial surgery
Experimental: Low Dose TXA; Low dose TXA is the intervention. A lower dose of TXa will be given as follows: 10 mg/kg loading dose and 5 mg/kg/h infusion	Drug: Low dose TXA; Other Names: Craniofacial surgery; Tranexamic Acid, cyclokapron,

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Efficacy of TXA in Childrens Having Craniosynostosis Surgery	Determine the efficacy ( as measured by blood loss and blood transfusion) of TXA in infants and children undergoing open craniofacial surgery with this lower dosage scheme.	perioperatively from the intraoperative period to 24 hours postoperatively

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Plasma Levels of TXA in Children Having Craniosynostosis Surgery	Determine the plasma levels (in micrograms/mL) of TXA in infants and children undergoing open craniofacial surgery with this dosage scheme	up to 24h postoperatively

Collaborators and Investigators

• Sponsor: Boston Children's Hospital
• Investigators: Principal Investigator: Susan Goobie, MD, Boston Children's Hospital; Principal Investigator: Nicola Disma, MD, Gaslini Children's Hospital

Publications and helpful links

General Publications

• Goobie SM, Staffa SJ, Meara JG, Proctor MR, Tumolo M, Cangemi G, Disma N. High-dose versus low-dose tranexamic acid for paediatric craniosynostosis surgery: a double-blind randomised controlled non-inferiority trial. Br J Anaesth. 2020 Sep;125(3):336-345. doi: 10.1016/j.bja.2020.05.054. Epub 2020 Jun 30.

Study record dates

Study Major Dates

• Study Start: August 1, 2014
• Primary Completion (Actual): December 1, 2017
• Study Completion (Actual): January 1, 2018

Study Registration Dates

• First Submitted: July 10, 2014
• First Submitted That Met QC Criteria: July 10, 2014
• First Posted (Estimate): July 11, 2014

Study Record Updates

• Last Update Posted (Actual): January 31, 2020
• Last Update Submitted That Met QC Criteria: January 22, 2020
• Last Verified: January 1, 2020

More Information

Terms related to this study

• Keywords: tranexamic acid; Antifibrinolytic; Craniofacial Surgery
• Additional Relevant MeSH Terms: Congenital Abnormalities; Musculoskeletal Diseases; Bone Diseases; Craniofacial Abnormalities; Musculoskeletal Abnormalities; Bone Diseases, Developmental; Dysostoses; Synostosis; Craniosynostoses; Molecular Mechanisms of Pharmacological Action; Fibrin Modulating Agents; Antifibrinolytic Agents; Hemostatics; Coagulants; Tranexamic Acid
• Other Study ID Numbers: P00008434

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No