Spinal tracts producing slow components of spinal cord potentials evoked by descending volleys in man

Electroencephalography and Clinical Neurophysiology
M TomitaH Baba

Abstract

Slow negative (N) and slow positive (P) waves are frequently produced in the posterior epidural space at the lumbosacral enlargement by epidural stimulation of the rostral part of human spinal cord. The production of these slow potentials are thought to be responsible for analgesia at the stimulated segment as well as below that level. In order to define the spinal tract which mediates these slow potentials, we stimulated directly or from the epidural space the dorsal, dorsolateral, lateral and ventral columns at the cervical or thoracic level, and epidurally recorded spinal cord potentials (des.SCPs) at the lumbosacral enlargement in 7 patients who underwent spine or spinal cord surgery. The des.SCPs recorded in the lumbosacral enlargement consisted of polyphasic spike potentials followed by slow N and P waves. At a near threshold level of stimulus intensity the slow N and P potentials were consistently elicited only by stimulation of the dorsal column. The slow waves were also produced by intense stimulation of other tracts, but remained significantly (P < 0.05 - P < 0.01) smaller than those evoked by dorsal column stimulation when compared at the same stimulus intensity. Moreover, the slow P wave could not be elicited even b...Continue Reading

References

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Citations

Nov 1, 1996·Electroencephalography and Clinical Neurophysiology·T TakadaK Shimoji
Jul 23, 2003·Anesthesia and Analgesia·Toshiyuki TobitaHiroshi Baba
May 29, 2002·Anesthesia and Analgesia·Ban C H Tsui, Brendan Finucane

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