Assessing carpal tunnel syndrome with magnetoneurography

• 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
• Format: Article
• Language: English
• Subjects: Carpal tunnel syndrome; Conduction velocity; Digital nerve; Magnetoneurography; Median nerve; Nerve conduction study
• ISSN: 1388-2457; 1872-8952
• DOI: 10.1016/j.clinph.2022.03.021

•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