Shock, Whole Blood, and Assessment of TBI S.W.A.T. (LITES TO 2) (SWAT)

Background

The LITES Network is an operational trauma center consortium which has the expertise, track record and confirmed capabilities to conduct prospective, multicenter, injury care and outcomes research of relevance to the Department of Defense (DoD). Clinical trials from the point of injury in the prehospital arena through the trauma bay and operating theatre, thru ICU and beyond discharge are feasible and critical to the overall goals of the network. Novel capabilities include prehospital point of care testing for shock severity and sequential coagulopathy measurements. The network and leadership have a track record of Exception From Informed Consent (EFIC) trials and expertise with those injury subtypes including traumatic brain injury, hemorrhagic shock and coagulopathy of trauma, poly-trauma and severe extremity trauma. In addition to the track record and proven capabilities, the LITES Network uses a central IRB and efficient methods to minimize time, resources, cost and regulatory burdens and improve recruitment, consent rates and ease of data acquisition to promote successful execution of those task orders provided to the network from the DoD.

Traumatic injury represents an incredible health care burden in the United States and worldwide.1 Hemorrhage and Traumatic Brain Injury (TBI) are responsible for the largest proportion of all trauma-related deaths. Despite advances in trauma resuscitation and brain injury management, few therapeutic interventions are available to reduce the downstream morbidity and mortality attributable to these injury patterns. It is the poly-trauma patient who suffers both hemorrhagic shock and traumatic brain injury where a paucity of evidence exists to direct treatment, limiting the development of beneficial trauma practice guidelines.

Ongoing traumatic blood loss is complicated by trauma induced coagulopathy which results in further unbridled hemorrhage and resultant shock and organ dysfunction. Secondary to increasing evidence and knowledge, in-hospital resuscitation of traumatic hemorrhage has changed over the past decade to reduce the coagulopathic response to ischemia and tissue injury. The underlying principle of current resuscitation practice focuses on preventing or reversing the effects of coagulopathy with the early use of a balanced component transfusion strategy (1:1:1 - plasma: packed red blood cells: platelets). This reconstituted strategy has also been coined 'whole blood-like' resuscitation despite being inferior from a compositional standpoint relative to Whole Blood (WB). The use of WB was historically the gold standard for treating hemorrhagic shock during World War I and II, prior to sweeping changes in blood banking practice. The use of WB for early trauma resuscitation is making a resurgence, primarily based upon the military experience and has been touted as the 'essential next step' in the evolution of trauma resuscitation. Despite its historical and more recent use, little is known regarding WB's benefit relative to the 'current practice' ratio based blood component therapy in the acutely injured patients and even less is known regarding its effects in patients with TBI.

Permissive hypotension has been thought to improve outcome in injured patients with hemorrhagic shock in the prehospital and acute resuscitation phase of treatment allowing for the ability to obtain surgical control of bleeding while minimizing ongoing hemorrhage. Despite this benefit for hemorrhagic shock patients, hypotension has been consistently shown to be associated with worse outcomes in patients with TBI. Interestingly, newer animal data suggests permissive hypotension may be beneficial in a swine TBI model.The majority of prior, high level TBI trials have excluded patients with concomitant hemorrhagic shock. Prospective evidence and long term TBI outcome data are lacking for these complex poly-trauma patients and the most appropriate blood pressure and most efficacious resuscitation target for patients with TBI and acute hemorrhage remain poorly characterized.

Hypothesis #1A: Whole blood resuscitation will be associated with a lower 4 hour mortality in poly-trauma patients as compared to those resuscitated with component therapy.

Hypothesis #1B: Whole blood resuscitation will be associated with a lower incidence of 12 hour and 24 hour mortality, a lower incidence of death from exsanguination, incidence of MOF, nosocomial infection, improved transfusion ratios, lower overall blood transfusion requirements and shorter time to hemostasis as compared to those resuscitated with component therapy.

Hypothesis #1C: Whole blood resuscitation will be associated with an improved Glasgow Outcome Score-Extended at 6 months post injury as compared to those resuscitated with component therapy in patients with traumatic brain injury.

Hypothesis #2A: A nadir prehospital and acute phase resuscitation systolic blood pressure greater than or equal to 120 mmHg will be associated with improved traumatic brain injury outcomes at discharge and at 6 months.

Hypothesis #2B: The magnitude of the dose depth curve of systolic blood pressure during the prehospital and acute phase resuscitation will be associated with neurological outcome differences at discharge and at 6 months following traumatic brain injury.

Research Design and Methods

Study Design: The LITES Network will perform a multicenter, prospective, observational cohort study over a 4 year period to determine the impact of whole blood resuscitation in trauma patients with hemorrhagic shock at risk of large volume resuscitation with and without TBI. Early whole blood resuscitation will be compared to standard component resuscitation. The study will also further characterize blood pressure and resuscitation endpoints in poly-trauma patients with traumatic brain injury. Six trauma sites with appropriate characteristics will be selected from 12 network sites across the country.

Study Setting: The study will be performed utilizing busy level I trauma centers from within the LITES Network located across the country, at sites where either whole blood has currently been incorporated into standard of care or where component blood transfusion is being utilized for patients in hemorrhagic shock at risk for large volume resuscitation. Due to the paucity of trauma centers who are currently utilizing whole blood for trauma patients as standard of care, the potential to incorporate sites outside of the current LITES Network may be required over time.