Penetrating brain injury, in which the skull and the dura beneath it are violated by a projectile or another penetrating object, forces clinicians into a set of uniquely difficult early decisions: how to perform hemostatic resuscitation, how to manage hematomas inside and outside the brain’s covering membranes, how to address neurovascular injury, and how to control dangerous rises in intracranial pressure. A new viewpoint published in the journal Neurocritical Care argues that despite the gravity of these injuries, dedicated clinical studies and evidence-based management for penetrating brain injury remain strikingly limited, and that the condition should not be treated as simply a more severe form of blunt traumatic brain injury or as a single homogeneous entity.
The authors, a group of neurointensivists from high-volume centers in the United States led by Ronald Alvarado-Dyer and Christos Lazaridis, emphasize that the biomechanics of penetrating injury differ fundamentally from blunt trauma. Ballistic or fragment-related energy transfer, skull and dural violation, contaminated wound tracts, a high burden of cerebrovascular injury, complex fractures, and extra-axial hemorrhagic lesions all drive distinct pathways of secondary brain injury. Care is further complicated by marked heterogeneity across institutions, regions, and military versus civilian settings, which limits the generalizability of any standardized pathway. The burden of these injuries is also unequally shared, concentrating heavily in certain larger cities, specific communities, and designated trauma centers, meaning most neurointensive care units encounter them only infrequently.
Against this backdrop, the Brain Trauma Foundation, funded by the US Department of Defense, convened a multidisciplinary expert group to integrate available evidence with structured consensus and produce updated management guidelines, published in 2026. The evidence base underpinning the new document is thin. Across 26 key questions, 125 studies contributed evidence and 80 additional studies provided contextual data, but most of that evidence was judged to be of low quality. Only four key questions reached moderate-strength evidence: the choice between conventional angiography and computed tomography angiography, the management of bihemispheric injury, the use of the Surviving Penetrating Injury to the Brain score, and infection associated with cerebrospinal fluid fistulas.
One of the domains most relevant to neurocritical care is intracranial pressure and cerebral perfusion pressure. The guidelines state that there is insufficient evidence to support strong or moderate-strength recommendations on these targets, but that adult patients with severe penetrating brain injury, defined conventionally as a Glasgow Coma Scale score of 3 to 8, should be managed with intracranial pressure monitoring to reduce mortality. Maintaining pressure below 22 mm Hg can reduce mortality and improve six-month neurological outcomes, according to the guideline’s level IV recommendation, and expert consensus supports a cerebral perfusion pressure target of 60 to 70 mm Hg while actively assessing cerebral autoregulation.
The viewpoint’s authors treat the 22 mm Hg figure as a pragmatic anchor rather than a rigid rule. In penetrating injury, the meaning of any given pressure value depends on the overall clinical context, including the presence of mass effect, evolving hemorrhage, the adequacy of decompression if craniectomy has been performed, and the competing risks of the therapies themselves. Persistent or rising pressures, recurrent spikes, or an increasing treatment intensity may carry more decision-making value than isolated numeric thresholds. The perfusion pressure target likewise demands caution: raising perfusion pressure is not benign, because it may increase bleeding risk in unstable intracranial hemorrhages and worsen brain edema when cerebral blood flow becomes directly dependent on systemic pressure in a pressure-passive state. The authors also note that the reference level used to zero the pressure transducer and the patient’s head-of-bed elevation can substantially alter the calculated perfusion pressure, making reported values potentially incomparable across centers.
On surgery, the guidelines find insufficient evidence to favor early over delayed decompressive craniectomy, but recommend at level IV that craniectomy or craniotomy be performed early when indicated, with expert consensus urging urgent surgery for salvageable patients who have a surgical indication. The authors argue that urgency should be driven by physiology and trajectory rather than mechanism alone, and that the Glasgow Coma Scale score alone should not determine surgical candidacy. Supporting this antinihilist stance, they cite observational data from 4,895 patients with penetrating brain injury across 309 hospitals, where cranial surgery use varied enormously, from 0 to 71 percent. After propensity matching, hospitals with a higher surgical tendency had lower adjusted mortality, with an odds ratio of 0.61 and a 96 percent confidence interval of 0.47 to 0.78, and the strongest survival association appeared in patients with one or bilateral unreactive pupils. In a combat cohort, decompressive craniectomy performed within roughly five hours was associated with lower mortality.
Coagulopathy is common after traumatic brain injury and is consistently associated with worse outcomes across injury mechanisms, including penetrating trauma, with reported rates that appear to track injury severity and initial hemorrhagic patterns. The guidelines conclude that the evidence is insufficient to recommend routine use of viscoelastic testing or routine reversal of coagulopathy in these patients. The authors’ practical reading is that hemostatic assessment should not be delayed while waiting for a single ideal test: conventional assays such as platelet count, international normalized ratio, activated partial thromboplastin time, and fibrinogen remain widely available and can rapidly identify major derangements, while viscoelastic testing, where available, can add granularity on clot strength, fibrinogen contribution, and fibrinolysis. Not all abnormalities carry the same urgency; the most consequential are those plausibly linked to ongoing or impending bleeding, neurovascular injury, anticipated procedures, or imaging evidence of hemorrhage progression.
Neurovascular injury is another priority, because it drives secondary ischemic and hemorrhagic complications. The guidelines support computed tomography angiography as an initial screening modality while acknowledging that digital subtraction angiography remains the reference standard, and they direct that angiography be performed as soon as feasible when suspicion of cerebrovascular injury is high. The authors highlight a sobering accuracy figure: compared with digital subtraction angiography, computed tomography angiography in penetrating cerebrovascular injury has a sensitivity as low as 36.4 percent, with specificity of 85 percent. A negative scan should therefore not end evaluation when clinical or radiographic suspicion remains high, particularly since metallic artifact, suboptimal contrast timing, or incomplete vascular visualization can degrade image quality. Because traumatic intracranial aneurysms may develop in delayed fashion and their treatment improves the likelihood of survival, repeat vascular imaging is warranted, with consensus guidance suggesting a 7 to 21-day window, although optimal timing remains undefined.
The viewpoint’s most emphatic message concerns therapeutic nihilism. The guidelines’ stated overall purpose is to save lives, in part, by combating nihilism with information, and the authors strongly reject the misconception that all penetrating brain injury is fatal or that aggressive resuscitation is inherently inappropriate. Prognostic tools such as the Surviving Penetrating Injury to the Brain score can contextualize injury severity but should not be read as deterministic predictions for an individual patient, because prognosis is dynamic: serial examination, radiographic evolution, and treatment response may meaningfully alter estimated outcomes. Premature deterministic application of such models risks self-fulfilling prophecies, and the authors suggest their strongest role may be as population-level benchmarks for comparative analysis rather than real-time individual decisions. They caution, however, that combating nihilism should not imply indiscriminate intervention, since aggressive resuscitation, invasive monitoring, early surgery, and repeated vascular imaging all carry risks and may not suit every injury pattern or care setting.
The authors conclude that progress in penetrating brain injury care remains constrained by therapeutic nihilism, weak evidence, practice variability, and an overreliance on paradigms developed for blunt trauma. They frame penetrating brain injury as a distinct disease requiring dedicated study, with early vascular injury detection and surgical intervention representing priority research targets. Because these injuries are rare, they argue that future progress will require multicenter and cross-regional studies using high-quality observational data and randomized interventions, alongside prospective work on treatment-intensity trajectories and injury phenotyping, to build the evidence base that current guidelines so conspicuously lack.
Subject of Research: Updated clinical guideline recommendations and neurocritical care perspectives on the management of penetrating brain injury
Article Title: Penetrating Brain Injury: Neurocritical Care Perspectives on the Updated Brain Trauma Foundation Guidelines
Article References: Alvarado-Dyer, R., Badjatia, N., Choi, H. A., Cruz, J., Goldenberg, F. D., Mansour, A., Muehlschlegel, S., O’Phelan, K., Poblete, R. A., Robertson, C., Shutter, L., Suarez, J. I., Tsetsou, S., & Lazaridis, C. (2026). Penetrating Brain Injury: Neurocritical Care Perspectives on the Updated Brain Trauma Foundation Guidelines. Neurocritical Care. https://doi.org/10.1007/s12028-026-02710-0
Image Credits: AI Generated
DOI: 10.1007/s12028-026-02710-0
Keywords: penetrating brain injury, Brain Trauma Foundation, neurocritical care, intracranial pressure, decompressive craniectomy, coagulopathy, cerebrovascular injury, traumatic intracranial aneurysm, therapeutic nihilism, clinical guidelines, traumatic brain injury, neurointensivists
News Source: Cassandra Pierce. (October 29, 2026). New Guidelines Tackle Penetrating Brain Injury, Urging Doctors to Reject Nihilism. Scienmag.
