Cited by 248Traumatic Brain Injury ResearchTraumatic Brain Injury and Neurovascular DisturbancesAutomotive and Human Injury Biomechanics

Mild traumatic brain injury and diffuse axonal injury in swine

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Browne, Kevin D., Chen, Xiao-Han, Meaney, David F., Smith, Douglas H.·2011·Journal of Neurotrauma

Abstract

Until recently, mild traumatic brain injury (mTBI) or "concussion" was generally ignored as a major health issue. However, emerging evidence suggests that this injury is by no means mild, considering it induces persisting neurocognitive dysfunction in many individuals. Although little is known about the pathophysiological aspects of mTBI, there is growing opinion that diffuse axonal injury (DAI) may play a key role. To explore this possibility, we adapted a model of head rotational acceleration in swine to produce mTBI by scaling the mechanical loading conditions based on available biomechanical data on concussion thresholds in humans. Using these input parameters, head rotational acceleration was induced in either the axial plane (transverse to the brainstem; n=3), causing a 10- to 35-min loss of consciousness, or coronal plane (circumferential to the brainstem; n=2), which did not produce a sustained loss of consciousness. Seven days following injury, immunohistochemical analyses of the brains revealed that both planes of head rotation induced extensive axonal pathology throughout the white matter, characterized as swollen axonal bulbs or varicosities that were immunoreactive for accumulating neurofilament protein. However, the distribution of the axonal pathology was different between planes of head rotation. In particular, more swollen axonal profiles were observed in the brainstems of animals injured in the axial plane, suggesting an anatomic substrate for prolonged loss of consciousness in mTBI. Overall, these data support DAI as an important pathological feature of mTBI, and demonstrate that surprisingly overt axonal pathology may be present, even in cases without a sustained loss of consciousness.

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  • Concussion is thought to be a type of DAI because axons may be injured due to stretching.

    “As a neuropathological definition, concussion is thought to be a type of DAI because axons may be injured due to stretching (104, 105).”

    From Pituitary Dysfunction After Traumatic Brain Injury: A Clinical and Pathophysiological Approach (2015) · cites this paper as [104]

    The Discussion describes DAI as an important pathological feature of mild TBI or concussion and says axonal deformation may mechanically damage axons. It does not define concussion itself as a type of DAI; the Discussion cautions that the scope of the DAI designation in mild TBI remains uncertain. (LLM, conf=0.84)

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Research works printed but not linked: 3

  1. Adams J.H. Gennarelli T.A. Graham D.I. Brain damage in non missle head injury: observations in man and subhuman primates. In: Smith W.T., editor; Cavanaugh J.B., editor. Recent Advances in Neuropathology. Churchill Livingstone; Edinburgh: 1982. pp. 165–190. [Google Scholar]
  2. Gennarelli T.A. Thibault L.E. Experimental production of prolonged traumatic coma in the primate. In: Villani R., editor; Papo I., editor; Giovanelli M., editor; Gaini S.M., editor; Tomei G., editor. Advances in Neurotraumotology, 612. Excerpta Med; Amsterdam: 1982. pp. 31–33. [Google Scholar]
  3. Ommaya A.K. Yarnell P. Hirsch A., et al. Scaling of experimental data on cerebral concussion in sub-human primates to concussive thresholds in man, in Proceedings of the 11th Stapp Car Crash Conference. Warrendale, PA: SAE; 1967. pp. 73–80. [Google Scholar]

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Authors
Browne, K. D., Chen, X.-H., Meaney, D. F., & Smith, D. H.
Affiliations
  • University of Pennsylvania (US)
  • Center for Brain Injury and Repair, Department of Neurosurgery, University of Pennsylvania, Philadelphia, Pennsylvania.
Corresponding author
Smith, Douglas H.
Venue
Journal of Neurotrauma
Published
2011-09
Volume
28
Issue
9
Pages
1747-1755
ISSN
  • 0897-7151 (ISSN-L)
  • 1557-9042
OpenAlex
W2064707507
Cited by
248
References
59
Citations by year
2026: 6 · 2025: 10 · 2024: 11 · 2023: 20 · 2022: 16 · 2021: 17 · 2020: 19 · 2019: 21 · 2018: 24 · 2017: 20 · 2016: 24 · 2015: 18 · 2014: 14 · 2013: 12 · 2012: 12
FWCI
9.84
Type
journal article
Language
en
Open access
Locations
  • Journal of Neurotrauma (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (NS08803, NS‐056202)
  • National Institute of Neurological Disorders and Stroke (NS-038104, R01NS038104, NS-08803, P01NS056202, NS 056202)
Topics
  • Health Sciences › Medicine › Epidemiology › Traumatic Brain Injury Research
  • Health Sciences › Medicine › Neurology › Traumatic Brain Injury and Neurovascular Disturbances
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Automotive and Human Injury Biomechanics
Keywords
mild traumatic brain injury, concussion, diffuse axonal injury, porcine model, axonal pathology, neurofilaments, white matter, brainstem, loss of consciousness, neurocognitive impairment
MeSH terms
Acceleration, Animals, Brain, Brain Concussion, Rotation, Swine, Unconsciousness, Diffuse Axonal Injury

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