Article (Scientific journals)
Percutaneous electrical stimulation of lumbosacral roots in man.
MAERTENS DE NOORDHOUT, Alain; Rothwell, J. C.; Thompson, P. D. et al.
1988In Journal of Neurology, Neurosurgery and Psychiatry, 51 (2), p. 174-81
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Keywords :
Adult; Cauda Equina/physiology; Electric Stimulation; Electromyography; Female; Humans; Male; Middle Aged; Motor Neurons/physiology; Muscles/innervation; Peripheral Nerves/physiology; Reaction Time/physiology; Reference Values; Spinal Nerve Roots/physiology; Synaptic Transmission
Abstract :
[en] High voltage percutaneous electrical stimulation over the lumbosacral spinal column was used to assess conduction in the cauda equina of 13 normal subjects. Electromyographic activity elicited by such stimulation was recorded from various muscles of the lower limbs. The stimulating cathode was placed over the spinous process of each vertebral body and the anode kept on the iliac crest contralateral to the studied limb. Shifting the cathode in a rostro-caudal direction shortened the response latency in quadriceps, tibialis anterior and extensor digitorum brevis muscles. At moderate intensities (60% maximum), this occurred abruptly when the cathode was placed at levels corresponding to the exit sites from the spinal canal of the roots innervating these muscles. At these intensities, the size of the response in each muscle was largest when the cathode was placed over the conus medullaris or at or below the exit of the motor roots from the spine. Latencies were always equal to or shorter than those obtained with F-wave measurements, suggesting that peripheral motor axons, rather than intraspinal structures were activated by the stimulus. Collision experiments demonstrated that activation occurred at two sites: near the spinal cord and at the root exit site in the vertebral foramina. Recordings made from soleus indicated that larger diameter proprioceptive afferent fibres also could be activated. This technique might have useful clinical applications in the study of both proximal and distal lesions of the cauda equina and provide a non-invasive method of localising such lesions electrophysiologically.
Disciplines :
Neurology
Author, co-author :
MAERTENS DE NOORDHOUT, Alain  ;  Centre Hospitalier Universitaire de Liège - CHU > Neurologie CHR
Rothwell, J. C.
Thompson, P. D.
Day, B. L.
Marsden, C. D.
Language :
English
Title :
Percutaneous electrical stimulation of lumbosacral roots in man.
Publication date :
1988
Journal title :
Journal of Neurology, Neurosurgery and Psychiatry
ISSN :
0022-3050
eISSN :
1468-330X
Publisher :
BMJ Group, London, United Kingdom
Volume :
51
Issue :
2
Pages :
174-81
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 December 2011

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