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THE EFFECTS OF INTRATHECAL FROZEN SALINE PERFUSION ON THE THALAMIC RESPONSES AND DORSAL ROOT POTENTIALS RESPONDING TO SCIATIC NERVA STIMULATION AND NOXIOUS STIMULI Takashi TSUBOKAWA 1 1Department of Surgery, University of Kanazawa, Section of Neurosurgery, Emory University, Atlanta pp.685-692
Published Date 1969/6/1
DOI https://doi.org/10.11477/mf.1406202555
  • Abstract
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The purpose of this article is to find out the basic mechanism of the relief of intractable pain following intrathecal perfusion of frozen physiological saline.

(1) The action potential of Aδ and C fiber of intradural dorsal root responding to stimulation of sciatic nerve are disappeared and primary afferent depolarization by sciatic stimulation is also altered following perfusion of the frozen saline (60-80cc) at the lumbo-sacral level.

(2) Following intrathecal perfusion of the frozen saline, VPL evoked potential responded to sciatic nerve is not detected any alteration except shorting of positive phase following inital negative wave. But the responses of centre median and MRF are completly disappear and the effects continue at least one week after perfusion.

(3) The unitary firing of VPI. is just correspond to its evoked potential responding to sciatic stimula-tion. But the interval histogram of thalamic neuron which respond to noxious stimuli changes to more irregular pattern and its distribution curve is close to it of VPL. These neurons do not show any kind response to sciatic stimulation nor noxious stimuli.

(4) On the fifth day after perfusion, 11% of recorded neurons which respond to noxious stimuli before perfusion is still no response to sciatic stimul-ation nor noxious stimuli, 72% of recorded neurons shows same response as it of VPL and 17% of the neurons shows same response as pre-perfusion state.

(5) The percentage of non-response neurons to noxious stimuliis increased following two or three times perfusion in one week. And Effective period also increases to 2 weeks or more.

According these sesults, it is able to block conduc-tion of Aδ and C fiber, and to alter primary af-ferent depolarization at dorsal colum. The thalamic neurons responding to noxious stimuli do not acti-vate by noxious stimuli and sciatic stimulation following two or three times perfusion of frozen saline through the sub-arachnoidal space at the level of lumbo-sacral area. This technique might be use-full treatment for the relief of intractable pain except it locating on the face and high cervical area. And the pain receptive mechanism of thala-mus was discussed by these results.


Copyright © 1969, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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