title: Focal lesion in upper part of brachial plexus can be detected by magnetic cervical motor root stimulation.
abstract: BACKGROUND
  The utilities of magnetic cervical motor root stimulation are well known for lesions in the lower part of the brachial plexus, but not for lesions in the other parts.
  
  
  OBJECTIVE
  The aim of paper is to show the utilities of magnetic cervical motor root stimulation for lesions in the upper part of the brachial plexus.
  
  
  METHODS
  We analyzed the brachial plexus using both electrical stimulation at Erb's point and magnetic cervical motor root stimulation in a patient with brachial plexopathy caused by tumor invasion.
  
  
  RESULTS
  On the fourth day after onset, magnetic cervical motor root stimulation revealed abnormal findings in the upper part of the brachial plexus. Two weeks after onset, needle electromyography supported the existence of the focal lesion.
  
  
  CONCLUSIONS
  Magnetic cervical motor root stimulation is useful in detecting abnormal findings in the upper part of the brachial plexus, even at the acute phase.
authors.affiliation: Department of Neurology, Japanese Red Cross Medical Center, 4-1-22 Hiroo, Shibuya-ku, Tokyo 150-8935, Japan. hideyukimatsumoto.jp@gmail.com
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Matsumoto
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Tokushige
authors.forename: Hideji
authors.initials: H
authors.lastname: Hashida
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Hanajima
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Terao
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Ugawa
mesh_terms: D001917:Brachial Plexus / Q000293:injuries* / Q000503:physiopathology; D020516:Brachial Plexus Neuropathies / Q000175:diagnosis* / Q000503:physiopathology; D004558:Electric Stimulation; D004568:Electrodiagnosis / Q000379:methods*; D004576:Electromyography; D006801:Humans; D008297:Male; D008875:Middle Aged; D009431:Neural Conduction / Q000502:physiology*; D013126:Spinal Nerve Roots / Q000503:physiopathology*
keywords: Brachial plexopathy; Compound muscular action potential; Conduction block; Magnetic stimulation; Supramaximal stimulation