Tranexamic Acid in Pediatric Traumatic Brain Injury: Evidence‑Based Guidelines

Timing and Efficacy

• Each 15‑minute delay in TXA administration reduces its efficacy by approximately 10 % in children with acute traumatic brain injury (TBI) when treatment is initiated within the first 3 hours after injury. 1
• Administering TXA within the first hour after injury yields the greatest mortality benefit for pediatric TBI patients. 1
• Giving TXA after 3 hours from injury can increase the risk of bleeding‑related death, indicating that the 3‑hour window is an absolute deadline for most patients. 1

Evidence from the CRASH‑3 Trial

• The CRASH‑3 randomized controlled trial (12,737 TBI patients) showed that TXA reduces head‑injury‑related death in mild‑to‑moderate pediatric TBI (risk ratio 0.78) when administered within 3 hours; no mortality benefit was observed in severe TBI (GCS 3‑8). This high‑quality evidence supports routine use in the specified subgroup. 1
• In the same trial, vascular occlusive events (RR 0.98) and seizures (RR 1.09) occurred at similar rates in the TXA and placebo groups, indicating no appreciable increase in these adverse outcomes at standard dosing. 1

Contraindications

• Absolute contraindication: renal impairment without dose adjustment, because TXA is ~90 % renally excreted and can accumulate to toxic levels. 1

Safety Profile

• Standard pediatric dosing (15 mg/kg loading, then 2 mg/kg/h infusion for 8 h, total ≤100 mg/kg) does not increase thromboembolic risk in trauma populations. 1

Implementation Guidelines

• Rapid assessment: on arrival, confirm TBI diagnosis and ensure the time from injury is <3 hours. 1
• Neurologic evaluation: determine Glasgow Coma Scale (GCS); children with mild‑to‑moderate TBI (higher GCS) derive the greatest benefit from TXA. 1
• Loading dose: calculate 15 mg/kg and administer intravenously over 10 minutes. 1
• Do not delay TXA administration for viscoelastic testing, coagulation studies, or imaging beyond the initial CT scan. 1
• Maintenance infusion: start a continuous infusion of 2 mg/kg/h immediately after the loading dose and continue for 8 hours, ensuring the cumulative dose does not exceed 100 mg/kg. 1
• Renal monitoring: obtain an urgent estimate of creatinine clearance; adjust the dose proportionally for any degree of renal dysfunction. 1

Clinical Pitfalls

• Avoid postponing TXA while awaiting laboratory results or additional imaging beyond the first CT scan, as delays diminish efficacy. 1
• Do not use adult fixed‑dose regimens (e.g., 1 g + 1 g) in children; weight‑based dosing is essential for safety and effectiveness.
• Do not exceed an 8‑hour infusion duration or a total dose >100 mg/kg, because higher cumulative exposure is linked to increased seizure risk.
• In patients presenting >3 hours after injury, TXA should generally be withheld unless the child has a GCS < 9, where limited benefit may persist.
• Severe TBI (GCS 3‑8) shows less mortality benefit from TXA compared with mild‑to‑moderate injuries, reinforcing the importance of early treatment and appropriate patient selection. 1

Tranexamic Acid Dosage and Administration Guidelines

Introduction to Tranexamic Acid

• The recommended standard dose of tranexamic acid for trauma-related hemorrhage is 1 g loading dose administered intravenously over 10 minutes, followed by 1 g infusion over 8 hours, with administration as early as possible and within 3 hours of injury 2, 3

Trauma and Hemorrhage

• TXA should be administered as soon as possible after injury or onset of bleeding, as effectiveness decreases by 10% for every 15-minute delay 2, 3
• Early administration (≤1 hour from injury) significantly reduces mortality due to bleeding 3
• Administration after 3 hours post-injury may increase risk of death due to bleeding 3
• Pre-hospital administration should be considered to ensure early treatment 3

Stroke and Traumatic Brain Injury

• For stroke with hemorrhage, the recommended dose is 1 g intravenously over 10 minutes, followed by 1 g over 8 hours 4
• TXA has shown benefit in reducing head injury-related death when administered within 3 hours, particularly in mild to moderate traumatic brain injury 4, 3
• Current guidelines do not specifically recommend TXA for ischemic stroke 4

Alternative Routes of Administration

• Intravenous administration remains the recommended and evidence-based route 2, 4
• Current clinical guidelines do not include specific recommendations for intramuscular dosing of TXA 2

Safety Considerations

• Higher doses of TXA are associated with increased risk of seizures, particularly in cardiac surgery patients 4, 3
• Using TXA in ischemic stroke patients who are candidates for thrombolytic therapy could theoretically counteract the beneficial effects of thrombolytics 4

Historical and Alternative Dosing Regimens

• European guidelines from 2007 suggested TXA dosages of 10 to 15 mg/kg followed by an infusion of 1 to 5 mg/kg per hour 5

Common Pitfalls

• Delaying administration beyond 3 hours significantly reduces effectiveness and may increase mortality 2, 4, 3

Tranexamic Acid Administration Guidelines

Dosage and Administration

• The American College of Surgeons recommends an initial dose of 1 g for severe postpartum hemorrhage (>500 mL vaginal delivery, >1000 mL cesarean) 6
• The Anaesthesia guideline recommends a loading dose of 15 mg/kg followed by infusion of 2 mg/kg/hour in trauma 6
• The JAMA Surgery guideline recommends a maximum total dose of 100 mg/kg to reduce seizure risk, with higher doses associated with increased seizure risk 7

Special Populations

• The Anaesthesia guideline recommends volume-based dosing of 10 mL/kg for various blood products in pediatric patients 6

Safety Considerations

• The JAMA Surgery guideline warns that doses above 100 mg/kg increase seizure risk, particularly in cardiac surgery 7