A conduction block in sciatic nerves can be detected by magnetic motor root stimulation

Abstract Useful diagnostic techniques for the acute phase of sciatic nerve palsy, an entrapment neuropathy, are not well established. The aim of this paper is to demonstrate the diagnostic utility of magnetic sacral motor root stimulation for sciatic nerve palsy. We analyzed the peripheral nerves in...

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Bibliographic Details
Published in:Journal of the neurological sciences 2013-08, Vol.331 (1), p.174-176
Main Authors: Matsumoto, Hideyuki, Konoma, Yuko, Fujii, Kengo, Hanajima, Ritsuko, Terao, Yasuo, Ugawa, Yoshikazu
Format: Article
Language:English
Subjects:
Action Potentials - physiology
Adult
Ankle
Compound muscle action potential
Conduction block
Electric Stimulation
Electromyography
Humans
Magnetic stimulation
Magnetics
Male
Neural Conduction - physiology
Neurology
Piriformis syndrome
Sciatic nerve palsy
Sciatic Neuropathy - diagnosis
Sciatic Neuropathy - physiopathology
Supramaximal stimulation
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Summary:Abstract Useful diagnostic techniques for the acute phase of sciatic nerve palsy, an entrapment neuropathy, are not well established. The aim of this paper is to demonstrate the diagnostic utility of magnetic sacral motor root stimulation for sciatic nerve palsy. We analyzed the peripheral nerves innervating the abductor hallucis muscle using both electrical stimulations at the ankle and knee and magnetic stimulations at the neuro-foramina and conus medullaris levels in a patient with sciatic nerve palsy at the level of the piriformis muscle due to gluteal compression related to alcohol consumption. On the fourth day after onset, magnetic sacral motor root stimulation using a MATS coil (the MATS coil stimulation method) clearly revealed a conduction block between the knee and the sacral neuro-foramina. Two weeks after onset, needle electromyography supported the existence of the focal lesion. The MATS coil stimulation method clearly revealed a conduction block in the sciatic nerve and is therefore a useful diagnostic tool for the abnormal neurophysiological findings associated with sciatic nerve palsy even at the acute phase.
ISSN:0022-510X
1878-5883
DOI:10.1016/j.jns.2013.06.005