Tranexamic Acid Demonstrates Efficacy without Increased Risk for Venous Thromboembolic Events in Cranial Neurosurgery: Systematic Review of the Evidence and Current Applications in Nontraumatic Pathologies.

Background: The cautionary stance normally taken towards tranexamic acid (TXA) is rooted in concerns regarding its complication profile, namely its purported risk for venous thromboembolic events (VTEs). In the present review, we intend to bring increased attention to TXA as a remarkably valuable tool that does not appear to increase the risk for VTE when used as indicated in select patients.
Methods: We queried three databases to identify reporting use of TXA during nontraumatic cranial neurosurgery procedures (excluded traumatic brain injury). Data gathered included VTE complications, deep venous thrombosis, use of allogeneic blood transfusions, estimated blood loss, and operative duration.
Results: Twenty-eight studies were deemed eligible for inclusion in the present meta-analysis, including nine studies on surgical resection of intracranial neoplasms, ten studies on aneurysmal subarachnoid hemorrhage, and nine studies on craniosynostosis. In brain tumor surgery, TXA appears to successfully reduce blood loss without predisposing patients to VTE or seizure (P < 0.01). However, it does not appear to reduce rates of vasospasm in aneurysmal subarachnoid hemorrhage (P = 0.27), and its administration is not associated with clinically meaningful differences in long term neurological outcomes. For pediatric patients undergoing craniosynostosis procedures, TXA similarly reduces blood loss (P < 0.01). Nonetheless, low dosing protocols should be used because they appear effective and the effects of high dose TXA in children have not been studied.
Conclusions: TXA is an effective hemostatic agent that can be administered to reduce blood loss and transfusion requirements for a wide range of neurosurgical applications in a broad spectrum of patient populations.
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