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Related Experiment Videos

Reducing postischemic paraplegia using conjugated superoxide dismutase.

J M Agee1, T Flanagan, L H Blackbourne

  • 1Department of Surgery, University of Virginia Health Sciences Center, Charlottesville.

The Annals of Thoracic Surgery
|June 1, 1991
PubMed
Summary
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Polyethylene glycol-conjugated superoxide dismutase (PEG-SOD) protected rabbits from paralysis after spinal cord ischemia. This free radical scavenger improved spinal cord tolerance, reducing injury during aortic aneurysm repair models.

Area of Science:

  • Neurosurgery
  • Vascular Surgery
  • Biochemistry

Background:

  • Paraplegia is a risk following thoracic aortic aneurysm repair, with an incidence ranging from 2.2% to 24%.
  • Oxygen-derived free radicals generated during spinal cord reperfusion are implicated in neuronal damage.
  • Developing neuroprotective strategies is crucial for mitigating spinal cord injury during aortic procedures.

Purpose of the Study:

  • To investigate the efficacy of polyethylene glycol-conjugated superoxide dismutase (PEG-SOD) in enhancing spinal cord tolerance to ischemia.
  • To evaluate PEG-SOD's potential as a free radical scavenger to prevent paraplegia in a rabbit model.

Main Methods:

  • Thirty rabbits underwent 40 minutes of aortic occlusion to induce spinal cord ischemia.
  • Animals were divided into three groups: PEG-SOD treatment, superoxide dismutase (SOD) treatment, and placebo control.

Related Experiment Videos

  • PEG-SOD was administered at 25,000 U/kg 24 hours pre-occlusion, followed by two 10,000 U/kg doses during ischemia. SOD and placebo groups received equivalent treatments.

    • Main Results:

    • Only 2 out of 10 rabbits treated with PEG-SOD experienced complete paralysis; 8 showed reduced or no neurological impairment.
    • In contrast, 8 out of 10 control animals and 9 out of 10 SOD-treated animals were completely paralyzed.
    • A significantly higher proportion of PEG-SOD treated animals exhibited better neurological outcomes compared to control and SOD groups (p <= 0.05).

    Conclusions:

    • PEG-SOD administration effectively increased rabbit spinal cord tolerance to a 40-minute ischemic insult.
    • Scavenging free radicals with PEG-SOD may represent a promising therapeutic approach to reduce experimental spinal cord injury.
    • This study highlights the potential of PEG-SOD in preventing paraplegia associated with thoracic aortic aneurysm repair.