神経線維消失における末梢神経磁界

概要

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The measurement of magnetic field around a peripheral nerve is a possible technique for peripheral nerve diagnosis. It seems to be sensitive in comparison to skin potential measurement, which is widely used as a diagnostic tool, called nerve conduction study, as the permeability is almost homogeneous in the body. The normal component of the magnetic field around a nerve after stimulation has two pairs of peaks of in- and out- magnetic fluxes typically. However the conduction velocity or the intensity of the component of the field at those peaks may change if the nerve is injured and some fibers are lost. As nerve fiber loss is often observed in diabetic patients, the magnetic field around a diabetic sural nerve after electric stimulation was executed. Much variety of the velocity and the intensity of the peaks was observed between diabetic nerves than controls. In several cases, slower conduction and higher peak intensity ratio of conduction side to stimulation side were observed. The analysis of magnetic field seemed to be a possible method for fiber loss diagnosis.
社団法人日本磁気学会の論文
2008-03-01