What are the amplitude parameters for motor evoked potentials (MEPs)?

Updated: Aug 20, 2019
  • Author: Jasvinder Chawla, MD, MBA; Chief Editor: Selim R Benbadis, MD  more...
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Amplitude (peak to peak) is best expressed in terms of the percentage of the muscle response amplitude evoked by supramaximal peripheral nerve stimulation of the target muscle.

Latency and amplitude of MEPs vary among healthy subjects and no reference normal values for MEPs in healthy older adults are available. Clinically useful reference values for MEPs by TMS can be provided in healthy adults older than 70 years. As in the younger population, standing height is important in defining normal MEPs. The difference between sexes might be due to the lower height of women. [6]

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