What is the minimal montage recommended by the AEEGS for recording of lower limb somatosensory evoked potentials (SEPs)?

Updated: Feb 26, 2019
  • Author: Sombat Muengtaweepongsa, MD, MSc; Chief Editor: Selim R Benbadis, MD  more...
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Answer

Answer

The minimal montage recommended by the AEEGS for recording of lower limb SEPs is as follows:

  • Channel 4 - CPi-Fpz

  • Channel 3 - CPz-Fpz

  • Channel 2 - Fpz-C5S

  • Channel 1 - T12S-IC

An example of a posterior tibial nerve SEP recorded with this montage is shown in the image below.

Normal posterior tibial nerve somatosensory evoked Normal posterior tibial nerve somatosensory evoked potentials (SEPs) recorded using the minimal (4-channel) recording montage recommended by the American EEG Society (AAEGS) guidelines. Note that the second channel from the bottom is specified as Fpz-C5S, so that the far-field potentials appear as a P31 followed by an N34. Negativity at input 1 is shown as an upward deflection. Courtesy of American Electroencephalographic Society, 1994.

This montage does not include a channel for recording the peripheral nerve CAPs at the popliteal fossa. Thus, optimal recording of lower limb SEPs requires more than 4 channels; a signal average with at least 8 input channels offers the advantage that all channels can be recorded simultaneously.


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