Magnetic stimulation of the cauda equina in the spinal canal with a flat, large round coil

Hideyuki Matsumoto, Fitri Octaviana, Yasuo Terao, Ritsuko Hanajima, Akihiro Yugeta, Masashi Hamada, Satomi Inomata-Terada, Setsu Nakatani-Enomoto, Shoji Tsuji, Yoshikazu Ugawa

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Magnetic round coil stimulation over the spinal enlargement activates the spinal nerves at the neuro-foramina level. However, activation of the cauda equina in the spinal canal has never been described in the literature. This study, for which 40 healthy subjects were recruited, activated the cauda equina using a round 20-cm-diameter coil designated as a Magnetic Augmented Translumbosacral Stimulation (MATS) coil. Magnetic stimulation placing the edge of the coil over the L1 and L3 spinous processes elicited compound muscle action potentials (CMAPs) from the abductor hallucis muscle. The CMAPs were compared with those elicited through high-voltage electrical stimulation. The CMAP latencies to L1 level MATS coil stimulation were not significantly different from those evoked by electrical stimulation at the same level. The CMAP latencies to L3 level MATS coil stimulation were varied in each subject. In fact, the L1 level MATS coil stimulation is considered to activate the cauda equina at the root exit site from the conus medullaris; the L3 level MATS coil stimulation activates some mid-part of the cauda equina or the distal cauda equina by spreading current. The MATS coil facilitates evaluation of spinal nerve conduction in the cauda equina.

Original languageEnglish
Pages (from-to)46-51
Number of pages6
JournalJournal of the Neurological Sciences
Volume284
Issue number1-2
DOIs
Publication statusPublished - 15 Sep 2009

Keywords

  • Cauda equina
  • Compound muscle action potential
  • Magnetic stimulation
  • Motor evoked potential
  • Normal values

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