In addition to demyelination, which nerve conductions study findings suggest Guillain-Barre syndrome (GBS)?

Updated: Jul 14, 2021
  • Author: Michael T Andary, MD, MS; Chief Editor: Milton J Klein, DO, MBA  more...
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Other characteristics of GBS include the following:

  • Nerve motor action potentials: May be decreased, but this is technically difficult to determine until the abnormality is severe; the extent of decreased action potentials correlates with prognosis

  • Compound muscle action potential (CMAP): Amplitude may be decreased

  • Sensory abnormalities: Exhibited by most patients, but these findings are much less marked than they are in motor nerves; sural sparing is a common finding in patients with clinical sensory deficits

  • Abnormal (delayed, small, or absent) H-reflex: May be noted

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