How does the current direction affect motor evoked potentials (MEPs)?

Updated: Aug 20, 2019
  • Author: Jasvinder Chawla, MD, MBA; Chief Editor: Selim R Benbadis, MD  more...
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For circular coils, the direction of the current in the coil (clockwise or counterclockwise) must be selected first. The right hemisphere is stimulated preferentially with clockwise currents; the left hemisphere, by counterclockwise currents. The stimulating coil must be held firmly and tangentially against the stimulated structure.

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