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Abstract
Multiple trauma (MT) associated with hemorrhagic shock (HS) might lead to cerebral hypoperfusion and brain damage. We investigated cerebral alterations using a new porcine MT/HS model without traumatic brain injury (TBI) and assessed the neuroprotective properties of mild therapeutic hypothermia. Male pigs underwent standardized MT with HS (45% or 50% loss of blood volume) and resuscitation after 90/120 min (T90/T120). In additional groups (TH90/TH120) mild hypothermia (33°C) was induced following resuscitation. Normothermic or hypothermic sham animals served as controls. Intracranial pressure, cerebral perfusion pressure (CPP), and cerebral oxygenation (PtiO2) were recorded up to 48.5 h. Serum protein S-100B and neuron-specific enolase (NSE) were measured by ELISA. Cerebral inflammation was quantified on hematoxylin and eosin -stained brain slices; Iba1, S100, and inducible nitric oxide synthase (iNOS) expression was assessed using immunohistochemistry. Directly after MT/HS, CPP and PtiO2 were significantly lower in T90/T120 groups compared with sham. After resuscitation both parameters showed a gradual recovery. Serum protein S-100B and NSE increased temporarily as a result of MT/HS in T90 and T90/T120 groups, respectively. Cerebral inflammation was found in all groups. Iba1-staining showed significant microgliosis in T90 and T120 animals. iNOS-staining indicated a M1 polarization. Mild hypothermia reduced cerebral inflammation in the TH90 group, but resulted in increased iNOS activation. In this porcine long-term model, we did not find evidence of gross cerebral damage when resuscitation was initiated within 120 min after MT/HS without TBI. However, trauma-related microglia activation and M1 microglia polarization might be a consequence of temporary hypoxia/ischemia and further research is warranted to detail underlying mechanisms. Interestingly, mild hypothermia did not exhibit neuroprotective properties when initiated in a delayed fashion.
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Galvagno SM, Fox EE, Appana SN, Baraniuk S, Bosarge PL, Bulger EM, Callcut RA, Cotton BA, Goodman M, Inaba K, O’Keeffe T, Schreiber MA, Wade CE, Scalea TM, Holcomb JB, Stein DM. Outcomes after concomitant traumatic brain injury and hemorrhagic shock: A secondary analysis from the Pragmatic, Randomized Optimal Platelets and Plasma Ratios trial. J Trauma Acute Care Surg 2017; 83:668-674. [PMID: 28930959 PMCID: PMC5718977 DOI: 10.1097/ta.0000000000001584] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Often the clinician is faced with a diagnostic and therapeutic dilemma in patients with concomitant traumatic brain injury (TBI) and hemorrhagic shock (HS), as rapid deterioration from either can be fatal. Knowledge about outcomes after concomitant TBI and HS may help prioritize the emergent management of these patients. We hypothesized that patients with concomitant TBI and HS (TBI + HS) had worse outcomes and required more intensive care compared with patients with only one of these injuries. METHODS This is a post hoc analysis of the Pragmatic, Randomized Optimal Platelets and Plasma Ratios (PROPPR) trial. TBI was defined by a head Abbreviated Injury Scale score greater than 2. HS was defined as a base excess of -4 or less and/or shock index of 0.9 or greater. The primary outcome for this analysis was mortality at 30 days. Logistic regression, using generalized estimating equations, was used to model categorical outcomes. RESULTS Six hundred seventy patients were included. Patients with TBI + HS had significantly higher lactate (median, 6.3; interquartile range, 4.7-9.2) compared with the TBI group (median, 3.3; interquartile range, 2.3-4). TBI + HS patients had higher activated prothrombin times and lower platelet counts. Unadjusted mortality was higher in the TBI + HS (51.6%) and TBI (50%) groups compared with the HS (17.5%) and neither group (7.7%). Adjusted odds of death in the TBI and TBI + HS groups were 8.2 (95% confidence interval, 3.4-19.5) and 10.6 (95% confidence interval, 4.8-23.2) times higher, respectively. Ventilator, intensive care unit-free and hospital-free days were lower in the TBI and TBI + HS groups compared with the other groups. Patients with TBI + HS or TBI had significantly greater odds of developing a respiratory complication compared with the neither group. CONCLUSION The addition of TBI to HS is associated with worse coagulopathy before resuscitation and increased mortality. When controlling for multiple known confounders, the diagnosis of TBI alone or TBI+HS was associated with significantly greater odds of developing respiratory complications. LEVEL OF EVIDENCE Prognostic study, level II.
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Affiliation(s)
- Samuel M. Galvagno
- University of Maryland School of Medicine, Department of Anesthesiology, Chief, Division of Critical Care Medicine And Associate Director of Critical Care, University of Maryland Medical Center, Program in Trauma, R Adams Cowley Shock Trauma Center, 22 South Greene Street, T3N08, Shock Trauma Center, Baltimore, MD, 21201,
| | - Erin E. Fox
- Assistant Professor, Department of Surgery, Division of Acute Care Surgery, Center for Translational Injury Research (CeTIR), University of Texas Health Science Center at Houston, Houston, TX,
| | - Savitri N. Appana
- Senior Statistician, The University of Texas Health Sciences Center at Houston, School of Public Health, Department of Biostatistics, Houston, TX,
| | - Sarah Baraniuk
- Assistant Professor of Biostatistics, University of Texas-Houston Health Sciences Center School of Public Health, Houston, TX,
| | - Patrick L. Bosarge
- Associate Professor, University of Alabama School of Medicine, Department of Surgery, Division of Acute Care Surgery, Birmingham, AL,
| | - Eileen M. Bulger
- Professor, University of Washington Department of Surgery, Chief of Trauma, Harborview Medical Center, Seattle, WA,
| | - Rachel A. Callcut
- Associate Professor, Division of General Surgery, University of California San Francisco, San Francisco, CA,
| | - Bryan A. Cotton
- Professor, Department of Surgery, Division of Acute Care Surgery, University of Texas Health Science Center, Houston, TX,
| | - Michael Goodman
- Assistant Professor, Department of Surgery, University of Cincinnati School of Medicine, Cincinnati, OH,
| | - Kenji Inaba
- Associate Professor, Department of Surgery, University of Southern California Keck School of Medicine, Los Angeles, CA,
| | - Terence O’Keeffe
- Associate Professor, University of Arizona School of Medicine, Tucson, AZ,
| | - Martin A. Schreiber
- Professor, Oregon Health & Science University School of Medicine, Portland, OR
- Chief, Division of Trauma, Critical Care, and Acute Care Surgery,
| | - Charles E. Wade
- Professor, Department of Surgery, University of Texas Health Science Center, Houston, TX,
| | - Thomas M. Scalea
- Professor, Director, Program in Trauma, Francis X. Kelly Professor of Trauma Surgery, Physician-in-Chief, R Adams Cowley Shock Trauma Center, Baltimore, MD,
| | - John B. Holcomb
- Professor, Department of Surgery, University of Texas Health Science Center, Houston, TX,
| | - Deborah M. Stein
- R Adams Cowley Professor of Trauma, University of Maryland School of Medicine, Department of Surgery, Program in Trauma, Chief of Trauma and Director of Neurotrauma Critical Care, R Adams Cowley Shock Trauma Center, 22 South Greene Street, S4B04, Shock Trauma Center, Baltimore, MD, 21201,
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