As already mentioned, we expected different forms of electric impulses [4, 100, 213, 242, 243] to have differing effects on nerve fibers, if there is one at all, and not identical effects as studies of the literature indicated. On a model of sympathetic fibers, which are of small diameters, studies on a possible effect of an electric field established by skin electrodes were undertaken. Of course, the neurophysiologic differences between sympathetic and C-fibers had been noted, but in diameter and other criteria (see table 1) close relationships exist between the two types of fibers. Sympathetic fibers are very well suited, especially since they have an end organ which may be observed objectively: the vessels, which are not influenced by the method chosen for their evaluation, namely rheography [115, 136, 189]. If functional changes of the sympathetic system of fibers have to be made, one should be aware of the various effects the different states of this system have on vessels. Documentation on the changes in the end organs is presented in the following figures. In fig. 5 the result of direct mechanical stimulation of the sympathetic chain (approached operatively in a patient requiring section of this chain; who consented to physiologic observations during his operation) and of surgical section is presented. Fig. 6 shows the effect of sympathetic stimulation on cerebral circulation caused by placing ice cubes on the soles of the feet. Fig. 7 reveals the effect of a stellate block by a local anesthetic. With this information at hand, one may use skin electrodes to flood the stellate ganglion electrically. Fig. 8 and 9 show anodal and cathodal electrode positions respectively.
KeywordsTrigeminal Neuralgia Pain Reduction Transcutaneous Electric Nerve Stimulation Stellate Ganglion Sympathetic Chain
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