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Related Concept Videos

Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Related Experiment Video

Updated: Sep 30, 2025

Author Spotlight: Regenerative Peripheral Nerve Interface (RPNI) Surgery in Postamputation Pain Management
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Resorbable Nerve Wraps: Can They Be Overtightened?

Celine F Nicolas1, John J Corvi1, YuanDian Zheng1

  • 1Department of Orthopedic Surgery, Columbia University Irving Medical Center, New York, New York.

Journal of Reconstructive Microsurgery
|March 16, 2022
PubMed
Summary
This summary is machine-generated.

Tightly applied resorbable nerve wraps caused nerve compression in rats, leading to functional impairment and histological changes. While some recovery was observed, it suggests caution when using tight nerve wraps.

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Regenerative Medicine

Background:

  • Nerve wrapping aims to reduce scarring after nerve repair.
  • Optimal tightness of resorbable wraps is not well-defined.
  • This study investigates tight resorbable wraps on rat sciatic nerves.

Purpose of the Study:

  • To evaluate the effects of tightly applied resorbable extracellular matrix (ECM) nerve wraps on intact rat sciatic nerves.
  • To assess functional and histological outcomes following tight versus loose wrap application.

Main Methods:

  • Sciatic nerves of 24 rats were wrapped with porcine-derived ECM: tight (n=8), loose (n=8), or sham (n=8).
  • Functional recovery was assessed using sciatic functional index (SFI) and electrical stimulation.
  • Histological analysis was performed at 12 weeks.

Main Results:

  • Tight wraps caused significant functional impairment and delayed nerve response.
  • Histology revealed increased collagen and decreased axon density in the tight-wrap group.
  • Loose wraps showed outcomes comparable to sham controls.

Conclusions:

  • Tightly applied resorbable ECM wraps induce nerve compression, impairing function and altering nerve histology.
  • Functional recovery was incomplete, and results may not translate to human patients.
  • Careful application is crucial to avoid adverse effects of nerve wraps.