The effect of magnetic coil orientation on the excitation of the median nerve

S. J. Sun, Shozo Tobimatsu, M. Kato

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Objective - We investigated the effect of magnetic coil orientation on the excitation of the median nerve in healthy subjects. Methods - An 8- shaped coil, 3.2 cm in outer diameter, was used. The median nerve was stimulated at the elbow while the compound muscle action potentials (CMAPs) of abductor pollicis brevis muscle were recorded at 4 different directions of the induced current: orthodromic, antidromic, medio-lateral and latero- medial. Results - We found that the amplitude of the CMAP was the greatest in a medio-lateral (ML) direction. We also measured the induced electric field in the saline tank that mimicked the forearm. The induced electric field and its spatial gradient were the greatest in the ML direction among 4 directions. Conclusion - The fact that the forearm is a restrictive volume conductor may result in the different effects of coil orientation on the excitation of the median nerve at the elbow.

Original languageEnglish
Pages (from-to)328-335
Number of pages8
JournalActa Neurologica Scandinavica
Volume97
Issue number5
DOIs
Publication statusPublished - Jan 1 1998

Fingerprint

Median Nerve
Elbow
Forearm
Muscles
Action Potentials
Healthy Volunteers
Direction compound

All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology

Cite this

The effect of magnetic coil orientation on the excitation of the median nerve. / Sun, S. J.; Tobimatsu, Shozo; Kato, M.

In: Acta Neurologica Scandinavica, Vol. 97, No. 5, 01.01.1998, p. 328-335.

Research output: Contribution to journalArticle

@article{904f635b89b14ed2b544473a1b3dcca2,
title = "The effect of magnetic coil orientation on the excitation of the median nerve",
abstract = "Objective - We investigated the effect of magnetic coil orientation on the excitation of the median nerve in healthy subjects. Methods - An 8- shaped coil, 3.2 cm in outer diameter, was used. The median nerve was stimulated at the elbow while the compound muscle action potentials (CMAPs) of abductor pollicis brevis muscle were recorded at 4 different directions of the induced current: orthodromic, antidromic, medio-lateral and latero- medial. Results - We found that the amplitude of the CMAP was the greatest in a medio-lateral (ML) direction. We also measured the induced electric field in the saline tank that mimicked the forearm. The induced electric field and its spatial gradient were the greatest in the ML direction among 4 directions. Conclusion - The fact that the forearm is a restrictive volume conductor may result in the different effects of coil orientation on the excitation of the median nerve at the elbow.",
author = "Sun, {S. J.} and Shozo Tobimatsu and M. Kato",
year = "1998",
month = "1",
day = "1",
doi = "10.1111/j.1600-0404.1998.tb05962.x",
language = "English",
volume = "97",
pages = "328--335",
journal = "Acta Neurologica Scandinavica",
issn = "0001-6314",
publisher = "Wiley-Blackwell",
number = "5",

}

TY - JOUR

T1 - The effect of magnetic coil orientation on the excitation of the median nerve

AU - Sun, S. J.

AU - Tobimatsu, Shozo

AU - Kato, M.

PY - 1998/1/1

Y1 - 1998/1/1

N2 - Objective - We investigated the effect of magnetic coil orientation on the excitation of the median nerve in healthy subjects. Methods - An 8- shaped coil, 3.2 cm in outer diameter, was used. The median nerve was stimulated at the elbow while the compound muscle action potentials (CMAPs) of abductor pollicis brevis muscle were recorded at 4 different directions of the induced current: orthodromic, antidromic, medio-lateral and latero- medial. Results - We found that the amplitude of the CMAP was the greatest in a medio-lateral (ML) direction. We also measured the induced electric field in the saline tank that mimicked the forearm. The induced electric field and its spatial gradient were the greatest in the ML direction among 4 directions. Conclusion - The fact that the forearm is a restrictive volume conductor may result in the different effects of coil orientation on the excitation of the median nerve at the elbow.

AB - Objective - We investigated the effect of magnetic coil orientation on the excitation of the median nerve in healthy subjects. Methods - An 8- shaped coil, 3.2 cm in outer diameter, was used. The median nerve was stimulated at the elbow while the compound muscle action potentials (CMAPs) of abductor pollicis brevis muscle were recorded at 4 different directions of the induced current: orthodromic, antidromic, medio-lateral and latero- medial. Results - We found that the amplitude of the CMAP was the greatest in a medio-lateral (ML) direction. We also measured the induced electric field in the saline tank that mimicked the forearm. The induced electric field and its spatial gradient were the greatest in the ML direction among 4 directions. Conclusion - The fact that the forearm is a restrictive volume conductor may result in the different effects of coil orientation on the excitation of the median nerve at the elbow.

UR - http://www.scopus.com/inward/record.url?scp=0031953650&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031953650&partnerID=8YFLogxK

U2 - 10.1111/j.1600-0404.1998.tb05962.x

DO - 10.1111/j.1600-0404.1998.tb05962.x

M3 - Article

C2 - 9613564

AN - SCOPUS:0031953650

VL - 97

SP - 328

EP - 335

JO - Acta Neurologica Scandinavica

JF - Acta Neurologica Scandinavica

SN - 0001-6314

IS - 5

ER -