What is the insertional activity in nerve conduction studies?

Updated: Aug 20, 2018
  • Author: Stephen Kishner, MD, MHA; Chief Editor: Jonathan P Miller, MD  more...
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Answer

Insertional activity is the electrical activity present as the electrode is passed through muscle cells. These are discharge potentials provoked by the disruption of the cell membrane itself. Careful attention is given to the duration and amount of electrical noise after each movement of the needle. This activity is decreased in atrophied muscle or fatty tissue. Conversely, it is also increased in many abnormal conditions that cause membrane instability, such as neuropathies, radiculopathies, and inflammatory myopathies.


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