Effect of TMS coil orientation on the spatial distribution of motor evoked potentials in an intrinsic hand muscle

Autor(es)

Souza, Victor Hugo ^[1] ; Vieira, Taian Martins ^{[2, 3]} ; Cunha Peresa, Andre Salles ^[4] ; Cavalcanti Garcia, Marco Antonio ^[5] ; Vargas, Claudia Domingues ^[6] ; Baffa, Oswaldo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, FFCLRP, Dept Fis, Av Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Univ Fed Rio de Janeiro, Escola Educ Fis & Desportos, Dept Arte Corporal, Av Carlos Chagas Filho 540, BR-21941599 Rio De Janeiro, RJ - Brazil

^[3] Politecn Torino, Dipartimento Elettron & Telecomunicaz, Lab Ingn Sistema Neuromuscolare, Via Cavalli 22-H, I-10138 Turin - Italy

^[4] Inst Santos Dumont, Inst Int Neurociencia Natal Edmond & Lily Safra, Rodovia RN 160 Km 03, 3003, BR-59280000 Macaiba, RN - Brazil

^[5] Univ Fed Rio de Janeiro, Escola Educ Fis & Desportos, Dept Biociencias & Atividades Fis, Av Carlos Chagas Filho 540, BR-21941599 Rio De Janeiro, RJ - Brazil

^[6] Univ Fed Rio de Janeiro, Inst Biofis Carlos Chagas Filho, Av Carlos Chagas Filho 373, BR-21941902 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BIOMEDICAL ENGINEERING-BIOMEDIZINISCHE TECHNIK; v. 63, n. 6, p. 635-645, DEC 2018.
• Citações Web of Science: 2

Resumo

Previous reports on the relationship between coil orientation and amplitude of motor evoked potential (MEP) in transcranial magnetic stimulation (TMS) did not consider the effect of electrode arrangement. Here we explore this open issue by investigating whether TMS coil orientation affects the amplitude distribution of MEPs recorded from the abductor pollicis brevis (APB) muscle with a bi-dimensional grid of 61 electrodes. Moreover, we test whether conventional mono- and bipolar montages provide representative MEPs compared to those from the grid of electrodes. Our results show that MEPs with the greatest amplitudes were elicited for 45 degrees and 90 degrees coil orientations, i.e. perpendicular to the central sulcus, for all electrode montages. Stimulation with the coil oriented at 135 degrees and 315 degrees, i.e. parallel to the central sulcus, elicited the smallest MEP amplitudes. Additionally, changes in coil orientation did not affect the spatial distribution of MEPs over the muscle extent. It has been shown that conventional electrodes with detection volume encompassing the APB belly may detect representative MEPs for optimal coil orientations. In turn, non-optimal orientations were identified only with the grid of electrodes. High-density electromyography may therefore provide new insights into the effect of coil orientation on MEPs from the APB muscle. (AU)

• Processo FAPESP: 12/11937-0 - Avaliação por Eletromiografia de Alta Densidade do Recrutamento Muscular em Aplicações de Estimulação Magnética Transcraniana com Posicionamento Neuronavegado
• Beneficiário: Victor Hugo de Oliveira e Souza
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 13/07699-0 - Centro de Pesquisa, Inovação e Difusão em Neuromatemática - NeuroMat
• Beneficiário: Oswaldo Baffa Filho
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs