What is the role of EEG or visual evoked potentials (VEP) in the workup of acute disseminated encephalomyelitis (ADEM)?

Updated: Nov 08, 2018
  • Author: J Nicholas Brenton, MD; Chief Editor: Tarakad S Ramachandran, MBBS, MBA, MPH, FAAN, FACP, FAHA, FRCP, FRCPC, FRS, LRCP, MRCP, MRCS  more...
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  • The EEG often exhibits a disturbance of normal sleep rhythms and focal or generalized slowing. Epileptiform discharges are rarely seen in ADEM. [47] The absence of such abnormalities during the first bout of acute disseminated demyelinating illness in a child may increase the suspicion for ultimate MS diagnosis. Similar EEG abnormalities are found in adult ADEM. [84]

  • Visual evoked potentials (VEP) may prove helpful when optic neuritis is suspected but not apparent on clinical examination.

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