Utilization of Brain Tissue Oxygenation Monitoring and Association with Mortality Following Severe Traumatic Brain Injury.



The aim of this study was to describe the utilization patterns of brain tissue oxygen (PbtO2) monitoring following severe traumatic brain injury (TBI) and determine associations with mortality, health care use, and pulmonary toxicity.


We conducted a retrospective cohort study of patients from United States trauma centers participating in the American College of Surgeons National Trauma Databank between 2008 and 2016. We examined patients with severe TBI (defined by admission Glasgow Coma Scale score ≤ 8) over the age of 18 years who survived more than 24 h from admission and required intracranial pressure (ICP) monitoring. The primary exposure was PbtO2 monitor placement. The primary outcome was hospital mortality, defined as death during the hospitalization or discharge to hospice. Secondary outcomes were examined to determine the association of PbtO2 monitoring with health care use and pulmonary toxicity and included the following: (1) intensive care unit length of stay, (2) hospital length of stay, and (3) development of acute respiratory distress syndrome (ARDS). Regression analysis was used to assess differences in outcomes between patients exposed to PbtO2 monitor placement and those without exposure by using propensity weighting to address selection bias due to the nonrandom allocation of treatment groups and patient dropout.


A total of 35,501 patients underwent placement of an ICP monitor. There were 1,346 (3.8%) patients who also underwent PbtO2 monitor placement, with significant variation regarding calendar year and hospital. Patients who underwent placement of a PbtO2 monitor had a crude in-hospital mortality of 31.1%, compared with 33.5% in patients who only underwent placement of an ICP monitor (adjusted risk ratio 0.84, 95% confidence interval 0.76-0.93). The development of the ARDS was comparable between patients who underwent placement of a PbtO2 monitor and patients who only underwent placement of an ICP monitor (9.2% vs. 9.8%, adjusted risk ratio 0.89, 95% confidence interval 0.73-1.09).


PbtO2 monitor utilization varied widely throughout the study period by calendar year and hospital. PbtO2 monitoring in addition to ICP monitoring, compared with ICP monitoring alone, was associated with a decreased in-hospital mortality, a longer length of stay, and a similar risk of ARDS. These findings provide further guidance for clinicians caring for patients with severe TBI while awaiting completion of further randomized controlled trials.





Published Version (Please cite this version)


Publication Info

Komisarow, Jordan M, Camilo Toro, Jonathan Curley, Brianna Mills, Christopher Cho, Georges Motchoffo Simo, Monica S Vavilala, Daniel T Laskowitz, et al. (2022). Utilization of Brain Tissue Oxygenation Monitoring and Association with Mortality Following Severe Traumatic Brain Injury. Neurocritical care, 36(2). pp. 350–356. 10.1007/s12028-021-01394-y Retrieved from https://hdl.handle.net/10161/25393.

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Jordan Komisarow

Assistant Professor of Neurosurgery

Daniel Todd Laskowitz

Professor of Neurology

Our laboratory uses molecular biology, cell culture, and animal modeling techniques to examine the CNS response to acute injury. In particular, our laboratory examines the role of microglial activation and the endogenous CNS inflammatory response in exacerbating secondary injury following acute brain insult. Much of the in vitro work in this laboratory is dedicated to elucidating cellular responses to injury with the ultimate goal of exploring new therapeutic interventions in the clinical setting of stroke, intracranial hemorrhage, and closed head injury.

In conjunction with the Multidisciplinary Neuroprotection Laboratories, we also focus on clinically relevant small animal models of acute CNS injury. For example, we have recently characterized murine models of closed head injury, subarachnoid hemorrhage, intracranial hemorrhage and perinatal hypoxia-ischemia, in addition to the standard rodent models of focal stroke and transient forebrain ischemia. Recently we have adapted several of these models from the rat to the mouse to take advantage of murine transgenic technology. The objective of these studies are two-fold: to gain better insight into the cellular responses and pathophysiology of acute brain injury, and to test novel therapeutic strategies for clinical translation. In both cell culture systems and animal models, our primary focus is on examining the role of oxidative stress and inflammatory mechanism in mediating brain injury following acute brain insult, and examining the neuroprotective effects of endogenous apolipoprotein E in the injured mammalian central nervous system.

Our laboratory is committed to translational research, and has several active clinical research protocols, which are designed to bring the research performed in the Multidisciplinary Research Laboratories to the clinical arena. These protocols are centered around patients following stroke and acute brain injury, and are primarily based out of the Emergency Room and Neurocritical Care Unit. For example, we are currently examining the role of inflammatory mediators for use as a point-of-care diagnostic marker following stroke, intracranial hemorrhage, and closed head injury. We have recently translated a novel apoE mimetic from the preclinical setting to a multi center Phase 2 trial evaluating efficacy in intracranial hemorrhage. We are also examining the functional role of different polymorphisms of of inflammatory cytokines in the setting of acute brain injury and neurological dysfunction following cardiopulmonary bypass.


Michael Lucas James

Professor of Anesthesiology

With a clinical background in neuroanesthesia and neurointensive care, I have a special interest in translational research in intracerebral hemorrhage and traumatic brain injury. I am fortunate to be part of a unique team of highly motivated and productive individuals who allow me to propel ideas from bench to bedside and the ability to reverse translate ideas from the bedside back to the bench.


Tetsu Ohnuma

Assistant Professor in Anesthesiology

Vijay Krishnamoorthy

Associate Professor of Anesthesiology

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