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Free radical damage in acute nerve compression

A M Ress1, S Babovic, M F Angel

  • 1Division of Plastic, Reconstructive and Maxillofacial Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Annals of Plastic Surgery
|April 1, 1995
PubMed
Summary
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Diabetic nerves experience greater injury from compression and reperfusion, showing impaired blood flow recovery and increased oxidative stress compared to normal nerves. This suggests heightened vulnerability in diabetes mellitus.

Area of Science:

  • Neuroscience
  • Diabetology
  • Pathophysiology

Background:

  • Peripheral nerve injury results from ischemia and mechanical distortion.
  • Nerves in diabetes mellitus are more susceptible to injury.
  • Oxygen-derived free radical injury is a potential mechanism.

Purpose of the Study:

  • To investigate reperfusion-induced, oxygen-derived free radical injury in compressed peripheral nerves.
  • To compare injury in normal versus chronically diabetic rats.

Main Methods:

  • Sciatic nerves of normal and streptozocin-induced diabetic rats were subjected to 24-hour compression with or without 1-hour reperfusion.
  • Neural blood flow was quantified using fluorescein.
  • Nerve homogenates were analyzed for malondialdehyde and cellular defense enzymes.

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Main Results:

  • Compression reduced neural blood flow by 75%.
  • Diabetic nerves showed impaired blood flow recovery after reperfusion compared to normal nerves.
  • Increased indicators of lipoperoxidation were observed in diabetic nerves.

Conclusions:

  • Diabetic peripheral nerves are more prone to reperfusion injury following acute compression.
  • Oxidative stress and impaired vascular function contribute to nerve damage in diabetes.