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Diffuse axonal injury and traumatic coma in the primate

T A Gennarelli, L E Thibault, J H Adams

    Annals of Neurology
    |December 1, 1982
    PubMed
    Summary
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    Head acceleration without impact can cause traumatic coma and diffuse axonal injury (DAI) in monkeys. The severity of coma and DAI directly correlated with the extent of head motion, mirroring human head injury outcomes.

    Area of Science:

    • Neuroscience
    • Trauma Research
    • Biomechanics

    Background:

    • Traumatic brain injury (TBI) is a significant cause of mortality and disability.
    • Diffuse axonal injury (DAI) is a hallmark of severe TBI, but its precise causation by acceleration-deceleration forces remains an area of active research.
    • Understanding the biomechanical factors leading to DAI is crucial for developing effective prevention and treatment strategies.

    Purpose of the Study:

    • To investigate the relationship between head motion, traumatic coma duration, neurological impairment, and diffuse axonal injury (DAI) in a non-human primate model.
    • To determine if experimental head acceleration without impact can replicate the spectrum of human traumatic coma and DAI.
    • To establish coronal head acceleration as a potential primary mechanism for prolonged traumatic coma and its sequelae.

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    Main Methods:

    • Forty-five monkeys were subjected to controlled head acceleration without impact in sagittal, oblique, or lateral directions.
    • Coma duration, neurological deficits, and the presence and severity of DAI were assessed.
    • Coronal head motion was quantified and correlated with injury outcomes.

    Main Results:

    • A direct relationship was observed between the amount of coronal head motion and the duration of coma, neurological impairment, and DAI.
    • Concussion (coma < 15 minutes) with no DAI occurred primarily with sagittal head motion.
    • Prolonged coma (> 6 hours) and severe DAI, similar to human severe head injury, were predominantly observed in animals subjected to lateral head acceleration.

    Conclusions:

    • Coronal head acceleration without impact is a significant cause of traumatic coma and diffuse axonal injury (DAI).
    • The degree of DAI is directly proportional to the severity of injury, as indicated by coma duration and neurological outcome.
    • This experimental model effectively replicates the spectrum of human traumatic coma and DAI, supporting coronal head acceleration as a major etiological factor.