Which EMG findings are characteristic of botulism?

Updated: Feb 15, 2019
  • Author: Kirk M Chan-Tack, MD; Chief Editor: Pranatharthi Haran Chandrasekar, MBBS, MD  more...
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Characteristic electromyographic findings in patients with botulism include the following:

  • Brief, low-voltage compound motor-units

  • Small M-wave amplitudes

  • Overly abundant action potentials

An incremental increase in M-wave amplitude with rapid repetitive nerve stimulation may help to localize the disorder to the neuromuscular junction.

See Workup for more detail.

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