What is the role of evoked potentials in the workup of focal muscular atrophy (FMA)?

Updated: Feb 20, 2018
  • Author: Sridharan Ramaratnam, MD, MBBS; Chief Editor: Helmi L Lutsep, MD  more...
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Answer

Somatosensory evoked potentials are usually normal when the disorder involves only the motor system. They may be abnormal when the somatosensory pathway is affected.

Serial motor evoked potential (SMEP) recordings can be useful for the early detection of subclinical UMN dysfunction in motor neuron disease, which presents with pure LMN signs.


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