RT Journal Article SR Electronic T1 Haemoglobin transfusion threshold in traumatic brain injury optimisation (HEMOTION): a multicentre, randomised, clinical trial protocol JF BMJ Open JO BMJ Open FD British Medical Journal Publishing Group SP e067117 DO 10.1136/bmjopen-2022-067117 VO 12 IS 10 A1 Turgeon, Alexis F A1 Fergusson, Dean A A1 Clayton, Lucy A1 Patton, Marie-Pier A1 Zarychanski, Ryan A1 English, Shane A1 Docherty, Annemarie A1 Walsh, Timothy A1 Griesdale, Donald A1 Kramer, Andreas H A1 Scales, Damon A1 Burns, Karen E. A. A1 Boyd, John Gordon A1 Marshall, John C A1 Kutsogiannis, Demetrios J A1 Ball, Ian A1 Hébert, Paul C A1 Lamontagne, Francois A1 Costerousse, Olivier A1 St-Onge, Maude A1 Lessard Bonaventure, Paule A1 Moore, Lynne A1 Neveu, Xavier A1 Rigamonti, Andrea A1 Khwaja, Kosar A1 Green, Robert S A1 Laroche, Vincent A1 Fox-Robichaud, Alison A1 Lauzier, Francois A1 , YR 2022 UL http://bmjopen.bmj.com/content/12/10/e067117.abstract AB Introduction Traumatic brain injury (TBI) is the leading cause of mortality and long-term disability in young adults. Despite the high prevalence of anaemia and red blood cell transfusion in patients with TBI, the optimal haemoglobin (Hb) transfusion threshold is unknown. We undertook a randomised trial to evaluate whether a liberal transfusion strategy improves clinical outcomes compared with a restrictive strategy.Methods and analysis HEMOglobin Transfusion Threshold in Traumatic Brain Injury OptimizatiON is an international pragmatic randomised open label blinded-endpoint clinical trial. We will include 742 adult patients admitted to an intensive care unit (ICU) with an acute moderate or severe blunt TBI (Glasgow Coma Scale ≤12) and a Hb level ≤100 g/L. Patients are randomly allocated using a 1:1 ratio, stratified by site, to a liberal (triggered by Hb ≤100 g/L) or a restrictive (triggered by Hb ≤70 g/L) transfusion strategy applied from the time of randomisation to the decision to withdraw life-sustaining therapies, ICU discharge or death. Primary and secondary outcomes are assessed centrally by trained research personnel blinded to the intervention. The primary outcome is the Glasgow Outcome Scale extended at 6 months. Secondary outcomes include overall functional independence measure, overall quality of life (EuroQoL 5-Dimension 5-Level; EQ-5D-5L), TBI-specific quality of life (Quality of Life after Brain Injury; QOLIBRI), depression (Patient Health Questionnaire; PHQ-9) and mortality.Ethics and dissemination This trial is approved by the CHU de Québec—Université Laval research ethics board (MP-20-2018-3706) and ethic boards at all participating sites. Our results will be published and shared with relevant organisations and healthcare professionals.Trial registration number NCT03260478.