MULTICHANNEL DETECTION OF MAGNETIC COMPOUND ACTION FIELDS WITH STIMULATION OF THE INDEX AND LITTLE FINGERS

被引:9
作者
HASHIMOTO, I
MASHIKO, T
MIZUTA, T
IMADA, T
IWASE, Y
OKAZAKI, H
YOSHIKAWA, K
机构
[1] NIPPON TELEGRAPH & TEL PUBL CORP, BASIC RES LABS, INFORMAT SCI RES LAB, ATSUGI, KANAGAWA 243, JAPAN
[2] KOTO HOSP, DEPT ORTHOPED SURG, TOKYO, JAPAN
[3] SCI UNIV TOKYO, DEPT ELECT ENGN, TOKYO 162, JAPAN
来源
ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY | 1995年 / 97卷 / 02期
关键词
MAGNETIC COMPOUND ACTION FIELDS; DIGITAL NERVE; INDEX FINGER; LITTLE FINGER; RING FINGER; NUMERICAL ESTIMATION OF THE DIGITAL NERVE FIBERS;
D O I
10.1016/0924-980X(94)00287-H
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Magnetic compound action fields (CAFs) over the right arm were measured from 63 sensor positions with two 7-channel SQUID gradiometer systems following electrical stimulation of the index and little fingers as well as the ring finger separately. The wave forms of the CAFs were primarily biphasic, corresponding to the depolarization and repolarization currents of the stimulated nerves. Maximum amplitudes of the CAFs were 60-140 fT for the index finger stimulation and 40-90 fT for the little finger stimulation. The field mapping of the CAFs revealed a propagating quadrupolar pattern with different distributions for the index and little fingers. The results agree with the anatomical location of the median and ulnar nerves for the index and little finger stimulation respectively. The isofield maps, due to ring finger stimulation, showed complex patterns as a result of simultaneous activation of the median and ulnar nerves. By comparing the amplitudes of the maxima of the CAFs due to index finger stimulation with those after median nerve stimulation at the wrist, the numerical ratios of the constituent digital nerve fibers for the index finger within the median nerve at the wrist were estimated. The ratios of 0.14-0.41 (mean 0.27), determined with measurement of the CAFs, are fairly consistent with those calculated from the reported histological data.
引用
收藏
页码:102 / 113
页数:12
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