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Traumatic Brain Injury l: Introduction01:28

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DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...
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Induction of Diffuse Axonal Brain Injury in Rats Based on Rotational Acceleration
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Abnormal corticospinal excitability in traumatic diffuse axonal brain injury.

Montse Bernabeu1, Asli Demirtas-Tatlidede, Eloy Opisso

  • 1Guttmann University Institute for Neurorehabilitation-UAB , Badalona, Spain.

Journal of Neurotrauma
|July 17, 2009
PubMed
Summary

Severe traumatic brain injury (TBI) alters cortical motor excitability, with reduced motor evoked potential (MEP) and increased motor threshold (MT) correlating with diffuse axonal injury (DAI) severity and motor impairment.

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06:14

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05:30

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Corticospinal Excitability Modulation During Action Observation
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Area of Science:

  • Neuroscience
  • Neurology
  • Rehabilitation Medicine

Background:

  • Severe traumatic brain injury (TBI) can cause diffuse axonal injury (DAI), leading to significant motor deficits.
  • Understanding cortical motor excitability is crucial for assessing TBI-related neurological damage and recovery potential.

Purpose of the Study:

  • To investigate cortical motor excitability in patients with DAI following severe TBI.
  • To correlate neurophysiological findings with DAI severity and motor impairment.

Main Methods:

  • Utilized transcranial magnetic stimulation (TMS) paradigms to assess excitatory and inhibitory cortical function.
  • Measured resting motor threshold (MT), motor evoked potential (MEP) parameters, and silent period (SP) duration.
  • Compared 17 TBI patients with 11 healthy controls, analyzing relationships with DAI severity and motor deficits.

Main Results:

  • TBI patients exhibited higher MT, smaller MEP areas, and narrower input-output curves than controls (p < 0.05).
  • Excitability alterations were more pronounced with increased DAI severity and motor impairment (p < 0.005).
  • Intracortical inhibition (SP duration) showed no significant differences between groups.

Conclusions:

  • Cortical excitatory and inhibitory mechanisms are differentially affected in TBI.
  • Altered corticospinal excitation is primarily driven by DAI severity and linked to motor dysfunction.
  • Restoration of motor function may depend on the normalization of cortical excitability parameters.