What is the role of EMG in the workup of congenital facial paralysis?

Updated: Jan 07, 2019
  • Author: Alan D Bruns, MD, FACS; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Answer

Electromyography (EMG)

  • This test determines the amount of activity of muscle itself. It records motor unit potentials of voluntary and involuntary muscle contraction, as well as spontaneous muscle fiber activity.

  • Degeneration of lower motor neuron is followed by fibrillation potentials at 14-21 days.

  • Polyphasic potentials can be observed 6-12 weeks before clinical improvement.


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