What is the role of needle electromyography (EMG) in the diagnosis of Guillain-Barre syndrome (GBS)?

Updated: Jun 24, 2020
  • Author: Michael T Andary, MD, MS; Chief Editor: Milton J Klein, DO, MBA  more...
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Answer

Signs of demyelination can include the following:

  • Nerve conduction slowing

  • Prolongation of the distal latencies

  • Prolongation of the F-waves [1, 2]

  • Conduction block or dispersion of responses: Evidence frequently demonstrated at sites of natural nerve compression

  • Weak muscles showing reduced recruitment: Demonstrated with needle examination (electromyography [EMG])


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