Assessing carpal tunnel syndrome with magnetoneurography

•Neural activity in carpal tunnel syndrome patients could be visualized using magnetoneurography.•The lesion site could be visualized using the amplitude or nerve conduction velocity.•Magnetoneurography could also visualize the improvement after surgery. To measure the neuromagnetic fields of carpal...

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Published in:Clinical neurophysiology 2022-07, Vol.139, p.1-8
Main Authors: Sasaki, Toru, Kawabata, Shigenori, Hashimoto, Jun, Hoshino, Yuko, Sekihara, Kensuke, Adachi, Yoshiaki, Akaza, Miho, Fujita, Koji, Nimura, Akimoto, Yoshii, Toshitaka, Miyano, Yuki, Mitani, Yuki, Watanabe, Taishi, Sato, Shinji, Kim, Sukchan, Okawa, Atsushi
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Language:English
Subjects:
Carpal tunnel syndrome
Conduction velocity
Digital nerve
Magnetoneurography
Median nerve
Nerve conduction study
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container_title Clinical neurophysiology
container_volume 139
creator Sasaki, Toru
Kawabata, Shigenori
Hashimoto, Jun
Hoshino, Yuko
Sekihara, Kensuke
Adachi, Yoshiaki
Akaza, Miho
Fujita, Koji
Nimura, Akimoto
Yoshii, Toshitaka
Miyano, Yuki
Mitani, Yuki
Watanabe, Taishi
Sato, Shinji
Kim, Sukchan
Okawa, Atsushi
description •Neural activity in carpal tunnel syndrome patients could be visualized using magnetoneurography.•The lesion site could be visualized using the amplitude or nerve conduction velocity.•Magnetoneurography could also visualize the improvement after surgery. To measure the neuromagnetic fields of carpal tunnel syndrome patients after electrical digital nerve stimulation and evaluate median nerve function with high spatial resolution. A superconducting quantum interference device magnetometer system was used to record neuromagnetic fields at the carpal tunnel after electrical stimulation of the middle digital nerve in 10 hands of nine patients with carpal tunnel syndrome. The patients were diagnosed based on symptoms (numbness, tingling, and pain) supported by a positive Phalen or Tinel sign. A novel technique was applied to remove stimulus-induced artifacts, and current distributions were calculated using a spatial filter algorithm and superimposed on X-ray. In 6 of the 10 hands, the amplitude of the inward current waveform attenuated to
doi_str_mv 10.1016/j.clinph.2022.03.021
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To measure the neuromagnetic fields of carpal tunnel syndrome patients after electrical digital nerve stimulation and evaluate median nerve function with high spatial resolution. A superconducting quantum interference device magnetometer system was used to record neuromagnetic fields at the carpal tunnel after electrical stimulation of the middle digital nerve in 10 hands of nine patients with carpal tunnel syndrome. The patients were diagnosed based on symptoms (numbness, tingling, and pain) supported by a positive Phalen or Tinel sign. A novel technique was applied to remove stimulus-induced artifacts, and current distributions were calculated using a spatial filter algorithm and superimposed on X-ray. In 6 of the 10 hands, the amplitude of the inward current waveform attenuated to &lt;70% or the nerve conduction velocity was &lt;40 m/s. The results of conventional nerve conduction studies were normal for two of these six hands. All four hands that could not be diagnosed by magnetoneurography had severe carpal tunnel syndrome superimposed on peripheral neuropathy secondary to comorbidities. Technical improvements enabled magnetoneurography to noninvasively visualize the electrophysiological nerve activity in carpal tunnel syndrome patients. 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subjects Carpal tunnel syndrome
Conduction velocity
Digital nerve
Magnetoneurography
Median nerve
Nerve conduction study
title Assessing carpal tunnel syndrome with magnetoneurography
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