Tranexamic acid to reduce head injury death in people with traumatic brain injury: the CRASH-3 international RCT.

Abstract

BACKGROUND\nTranexamic acid safely reduces mortality in traumatic extracranial bleeding. Intracranial bleeding is common after traumatic brain injury and can cause brain herniation and death. We assessed the effects of tranexamic acid in traumatic brain injury patients.\n\n\nOBJECTIVE\nTo assess the effects of tranexamic acid on death, disability and vascular occlusive events in traumatic brain injury patients. We also assessed cost-effectiveness.\n\n\nDESIGN\nRandomised trial and economic evaluation. Patients were assigned by selecting a numbered treatment pack from a box containing eight packs that were identical apart from the pack number. Patients, caregivers and those assessing outcomes were masked to allocation. All analyses were by intention to treat. We assessed the cost-effectiveness of tranexamic acid versus no treatment from a UK NHS perspective using the trial results and a Markov model.\n\n\nSETTING\n175 hospitals in 29 countries.\n\n\nPARTICIPANTS\nAdults with traumatic brain injury within 3 hours of injury with a Glasgow Coma Scale score of ≤\u200912 or any intracranial bleeding on computerised tomography scan, and no major extracranial bleeding, were eligible.\n\n\nINTERVENTION\nTranexamic acid (loading dose 1\u2009g over 10 minutes then infusion of 1\u2009g over 8 hours) or matching placebo.\n\n\nMAIN OUTCOME MEASURES\nHead injury death in hospital within 28 days of injury in patients treated within 3 hours of injury. Secondary outcomes were early head injury deaths, all-cause and cause-specific mortality, disability, vascular occlusive events, seizures, complications and adverse events.\n\n\nRESULTS\nAmong patients treated within 3 hours of injury (n\u2009=\u20099127), the risk of head injury death was 18.5% in the tranexamic acid group versus 19.8% in the placebo group (855/4613 vs. 892/4514; risk ratio 0.94, 95% confidence interval 0.86 to 1.02). In a prespecified analysis excluding patients with a Glasgow Coma Scale score of 3 or bilateral unreactive pupils at baseline, the results were 12.5% in the tranexamic acid group versus 14.0% in the placebo group (485/3880 vs. 525/3757; risk ratio 0.89, 95% confidence interval 0.80 to 1.00). There was a reduction in the risk of head injury death with tranexamic acid in those with mild to moderate head injury (166/2846 vs. 207/2769; risk ratio 0.78, 95% confidence interval 0.64 to 0.95), but in those with severe head injury (689/1739 vs. 685/1710; risk ratio 0.99, 95% confidence interval 0.91 to 1.07) there was no apparent reduction (p-value for heterogeneity\u2009=\u20090.030). Early treatment was more effective in mild and moderate head injury (p\u2009=\u20090.005), but there was no obvious impact of time to treatment in cases of severe head injury (p\u2009=\u20090.73). The risk of disability, vascular occlusive events and seizures was similar in both groups. Tranexamic acid is highly cost-effective for mild and moderate traumatic brain injury (base case of £4288 per quality-adjusted life-year gained).\n\n\nCONCLUSION\nEarly tranexamic acid treatment reduces head injury deaths. Treatment is cost-effective for patients with mild or moderate traumatic brain injury, or those with both pupils reactive.\n\n\nFUTURE WORK\nFurther trials should examine early tranexamic acid treatment in mild head injury. Research on alternative routes of administration is needed.\n\n\nLIMITATIONS\nTime to treatment may have been underestimated.\n\n\nTRIAL REGISTRATION\nCurrent Controlled Trials ISRCTN15088122, ClinicalTrials.gov NCT01402882, EudraCT 2011-003669-14, Pan African Clinical Trial Registry PACTR20121000441277.\n\n\nFUNDING\nThe project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 25, No. 26. See the NIHR Journals Library website for further project information. In addition, funding was provided by JP Moulton Charitable Trust, Joint Global Health Trials (Medical Research Council, Department for International Development and the Wellcome Trust). This project was funded by the NIHR Global Health Trials programme.