PreHospital Air Medical Plasma Trial (PAMPer)

Prehospital Air Medical Plasma (PAMPer) Phase III Multicenter, Prospective, Randomized, Open-label, Interventional Trial A Four Year Multicenter Open Label Randomized Trial

University of Texas, University of Louisville, Vanderbilt University, Case Western Reserve University, The University of Tennessee, Knoxville, JPS Health Network, The Methodist Hospital Research Institute

To determine the effect of the prehospital infusion during air transport of 2 units of AB plasma on 30 day mortality in patients with hemorrhagic shock as compared to conventional care.

Background: Although advances in the care of the severely injured patient have occurred over the last decade, patients continue to be plagued with uncontrolled hemorrhage resulting in significant early mortality and the development of multiple organ failure and associated complications. A primary driving force for this unbridled hemorrhage has been shown to be the early coagulopathy which complicates severe injury. Increasing evidence suggests that blood component transfusion protocols that address this early coagulopathy, once a patient arrives at a trauma center, are associated with lower mortality and a reduction in blood component transfusion requirements. Prehospital interventions which quell this early coagulopathy in an earlier setting have the potential to minimize or even prevent this vicious hemorrhagic cascade, further lowering blood component transfusion requirements and reducing the resultant morbid sequelae which complicates severe injury. Objective/Hypothesis: The primary hypothesis will be that prehospital infusion of plasma during air medical transport in patients with hemorrhagic shock will lower 30 day mortality. The secondary hypotheses include that prehospital infusion of plasma will reduce 24 hour blood transfusion, multiple organ failure, nosocomial infection, and acute lung injury, reduce or prevent the early coagulopathy as demonstrated by improving presenting coagulation and thromboelastography parameters, and reduce the early inflammatory cytokine response, thrombomodulin and increase protein C levels.

24-hour blood transfusion requirements will be determined by recording blood volume (mls) and number of Units transfused from the time of trauma bay arrival or upon completion of pre-hospital initiated plasma infusion. For survival bias analysis, volumes and number of blood transfusion Units received at 3, 6, 12, and 18 hours will also be recorded.

In hospital mortality will be prospectively recorded from the time of trauma bay arrival. Over the first 24 hours we will document and record the time of death in hours, while after the 24 hour time point, we will document and record the time of death in days from arrival. We suspect that patients in hemorrhagic shock will have a significant percentage of mortality occurring in the first 24 hour period.

Organ dysfunction will be evaluated via a well-validated scoring system referred to as the Multiple Organ Dysfunction Score (MODScore). Patients who are never admitted to the ICU or those with a length of ICU stay of less than 48 hours will be considered to have a MODScore of 0. A summary of the MODScore may be calculated by summing the worst scores of each of the individual systems over the course of the ICU stay (Table 1). A summary MODScore > 5 will be classified as multiple organ failure (MOF). Scores will be determined daily up until post injury day 28 or ICU discharge.

Development of ALI will be assessed which includes: 1) bilateral infiltrates on chest x-ray, 2) a capillary wedge pressure < 18mmHg, and 3) Pao2/Fio2 ratio < 300 via blood gas analysis. In those patients without a Swan-Ganz catheter to determine capillary wedge pressure, the absence of signs of, or clinical concern, for elevated left sided atrial pressures will be used for the diagnosis. All patients who remain intubated beyond the first 24 hours post-injury will be evaluated using blood gas analysis and chest x-ray evaluation. Those patients who remain intubated at 48 hours through 7 days will be reevaluated for this outcome at these time points. The diagnosis of TRALI will be defined as when ALI occurs within the first 6 hours from arrival at the trauma center as it is clinically defined.

Inclusion Criteria: Hemorrhagic shock not responsive to crystalloid infusion - Exclusion Criteria: Isolated Fall, Cervical cord injury, prisoner, pregnant patient, traumatic arrest -

Wu J, Moheimani H, Li S, Kar UK, Bonaroti J, Miller RS, Daley BJ, Harbrecht BG, Claridge JA, Gruen DS, Phelan HA, Guyette FX, Neal MD, Das J, Sperry JL, Billiar TR. High Dimensional Multiomics Reveals Unique Characteristics of Early Plasma Administration in Polytrauma Patients With TBI. Ann Surg. 2022 Oct 1;276(4):673-683. doi: 10.1097/SLA.0000000000005610. Epub 2022 Jul 19.

Gruen DS, Guyette FX, Brown JB, Okonkwo DO, Puccio AM, Campwala IK, Tessmer MT, Daley BJ, Miller RS, Harbrecht BG, Claridge JA, Phelan HA, Neal MD, Zuckerbraun BS, Yazer MH, Billiar TR, Sperry JL. Association of Prehospital Plasma With Survival in Patients With Traumatic Brain Injury: A Secondary Analysis of the PAMPer Cluster Randomized Clinical Trial. JAMA Netw Open. 2020 Oct 1;3(10):e2016869. doi: 10.1001/jamanetworkopen.2020.16869.

Gruen DS, Brown JB, Guyette FX, Vodovotz Y, Johansson PI, Stensballe J, Barclay DA, Yin J, Daley BJ, Miller RS, Harbrecht BG, Claridge JA, Phelan HA, Neal MD, Zuckerbraun BS, Billiar TR, Sperry JL; PAMPer study group. Prehospital plasma is associated with distinct biomarker expression following injury. JCI Insight. 2020 Apr 23;5(8):e135350. doi: 10.1172/jci.insight.135350.

Pusateri AE, Moore EE, Moore HB, Le TD, Guyette FX, Chapman MP, Sauaia A, Ghasabyan A, Chandler J, McVaney K, Brown JB, Daley BJ, Miller RS, Harbrecht BG, Claridge JA, Phelan HA, Witham WR, Putnam AT, Sperry JL. Association of Prehospital Plasma Transfusion With Survival in Trauma Patients With Hemorrhagic Shock When Transport Times Are Longer Than 20 Minutes: A Post Hoc Analysis of the PAMPer and COMBAT Clinical Trials. JAMA Surg. 2020 Feb 1;155(2):e195085. doi: 10.1001/jamasurg.2019.5085. Epub 2020 Feb 19.

Sperry JL, Guyette FX, Brown JB, Yazer MH, Triulzi DJ, Early-Young BJ, Adams PW, Daley BJ, Miller RS, Harbrecht BG, Claridge JA, Phelan HA, Witham WR, Putnam AT, Duane TM, Alarcon LH, Callaway CW, Zuckerbraun BS, Neal MD, Rosengart MR, Forsythe RM, Billiar TR, Yealy DM, Peitzman AB, Zenati MS; PAMPer Study Group. Prehospital Plasma during Air Medical Transport in Trauma Patients at Risk for Hemorrhagic Shock. N Engl J Med. 2018 Jul 26;379(4):315-326. doi: 10.1056/NEJMoa1802345.

Reynolds PS, Michael MJ, Cochran ED, Wegelin JA, Spiess BD. Prehospital use of plasma in traumatic hemorrhage (The PUPTH Trial): study protocol for a randomised controlled trial. Trials. 2015 Jul 30;16:321. doi: 10.1186/s13063-015-0844-5.