What is the role of EMG and NCS in the workup of congenital muscular dystrophy (CMD)?

Updated: Jul 03, 2019
  • Author: Emad R Noor, MBChB; Chief Editor: Amy Kao, MD  more...
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EMG and NCS should be performed in all patients with suspected congenital muscular dystrophy to confirm myopathy and to exclude other diseases.

NCS results are normal except in some cases with mutations in laminin-α2, in which mild neuropathic changes may be seen (some with demyelinating features).

EMG usually shows typical small-amplitude, narrow-duration motor-unit potentials with early recruitment.

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