A new method to measure caudal motor conduction time using magnetic stimulation

Ryoon Han Tai, Jong Paik Nam, Jae Lee Seong, Sun Kwon Bum

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Although central motor conduction time (CMCT) has been used for the diagnosis of lumbosacral spinal stenosis (LSSS), its diagnostic value is limited due to the short length of the involved segment compared to the long length of the total conduction distance. To overcome this, we introduce a new method to measure the caudal motor conduction time (caudal MCT) using magnetic stimulation. Magnetic stimulation was applied to the vertex and the T12 and S1 spinous processes for transcortical, thoracic, and sacral stimulation, respectively, and compound muscle action potentials were recorded simultaneously from the rectus abdominis (RA) and the right and left abductor hallucis (AH) muscles using three channels. CMCT was calculated by the latency difference in the AH response between transcortical and sacral stimulation, and between transcortical and thoracic stimulation for RA. Caudal MCT was calculated by subtracting CMCT for RA from that for AH. Caudal MCT was delayed in patients with LSSS compared to normal persons. We suggest that measuring caudal MCT may be useful for the diagnosis of LSSS, but its diagnostic sensitivity and specificity requires prospective study.

Original languageEnglish
Pages (from-to)727-731
Number of pages5
JournalMuscle and Nerve
Volume30
Issue number6
DOIs
StatePublished - 1 Dec 2004

Fingerprint

Spinal Stenosis
Rectus Abdominis
Thorax
Muscles
Action Potentials
Prospective Studies
Sensitivity and Specificity

Keywords

  • Caudal motor conduction time
  • Central motor conduction time
  • Magnetic stimulation
  • Motor evoked potential
  • Spinal stenosis

Cite this

Tai, Ryoon Han ; Nam, Jong Paik ; Seong, Jae Lee ; Bum, Sun Kwon. / A new method to measure caudal motor conduction time using magnetic stimulation. In: Muscle and Nerve. 2004 ; Vol. 30, No. 6. pp. 727-731.
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A new method to measure caudal motor conduction time using magnetic stimulation. / Tai, Ryoon Han; Nam, Jong Paik; Seong, Jae Lee; Bum, Sun Kwon.

In: Muscle and Nerve, Vol. 30, No. 6, 01.12.2004, p. 727-731.

Research output: Contribution to journalArticle

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