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Related Concept Videos

Spinal Cord Injury ll: Pathophysiology01:14

Spinal Cord Injury ll: Pathophysiology

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Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
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Secondary Spinal Cord Injury llI: Pathophysiology01:25

Secondary Spinal Cord Injury llI: Pathophysiology

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Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...
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An Ex Vivo Laser-induced Spinal Cord Injury Model to Assess Mechanisms of Axonal Degeneration in Real-time
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Progressive Remote Axonal Degeneration Following Spinal Cord Injury: A Histological and MRI Study.

Gergely David1, Alice Motovylyak2, Felix Schlegel3

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Summary
This summary is machine-generated.

Spinal cord injury (SCI) causes remote axonal degeneration, detectable by MRI. This study links MRI changes to degeneration, offering insights for new treatments.

Keywords:
atrophyaxonal degenerationdiffusion tensor imagingimmunohistochemistryremote degenerationtraumatic spinal cord injury

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Area of Science:

  • Neuroscience
  • Radiology
  • Pathology

Background:

  • Spinal cord injury (SCI) leads to neuroanatomical changes beyond the lesion site.
  • Magnetic resonance imaging (MRI) is crucial for observing these changes in humans.
  • Understanding the structural basis of these changes is vital for developing therapeutic strategies.

Purpose of the Study:

  • To elucidate the structural underpinnings of neuroanatomical changes after SCI.
  • To characterize the spatiotemporal distribution of these changes using histology and MRI.
  • To correlate MRI findings with axonal degeneration and functional recovery.

Main Methods:

  • A rat contusion SCI model was used.
  • Histology (SMI-32 immunohistochemistry) assessed axonal degeneration at various time points and injury severities.
  • Ex vivo structural MRI and diffusion tensor imaging were performed rostral to the injury site.

Main Results:

  • Axonal degeneration was evident as early as 2 days post-injury (dpi) and persisted up to 90 dpi.
  • Degeneration severity correlated with injury severity and affected specific white matter tracts.
  • MRI revealed corresponding changes, including reduced fractional anisotropy and gray matter area, correlating with functional recovery.

Conclusions:

  • Neuroanatomical MRI changes remote from the SCI site are linked to axonal degeneration.
  • Correlative, multimodal approaches are valuable for understanding SCI.
  • This research provides translational insights for neuroprotection and rehabilitation.