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February 13, 2014: Neurapraxia

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February 13, 2014

Neurapraxia was first described in 1942 by Dr. Seddon who also named it "transient block" (1). It is the mildest form of peripheral nerve injury, characterized as transient loss of motor or sensory conduction without nerve structural changes.  The motor and proprioceptive fibers are affected more often.  Usually the nerves regain function in days to weeks. Cold, ischemia, compression, and blunt injury are common causes. The exact mechanism is unknown but lamellar separation of myelin sheath was found to be related (2).

References

  1. Seddon HJ. A classification of nerve injuries. Br Med J 1942; 2:237-239.
  2. Yan AH, Hui L, Shi Y, Ren Z, Xie L. The study of facial neurapraxia. Lin Chuang Er Bi Yan Hou Ke Za Zhi 2000; 14: 364-365.

Submitted by Lingling Rong, MD, Resident Physician, University of South Florida 

Disclosures: Dr. Rong is a junior member of the AAN

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