TY - JOUR
T1 - Magnetic lumbosacral motor root stimulation with a flat, large round coil
AU - Matsumoto, Hideyuki
AU - Octaviana, Fitri
AU - Hanajima, Ritsuko
AU - Terao, Yasuo
AU - Yugeta, Akihiro
AU - Hamada, Masashi
AU - Inomata-Terada, Satomi
AU - Nakatani-Enomoto, Setsu
AU - Tsuji, Shoji
AU - Ugawa, Yoshikazu
N1 - Funding Information:
This work was supported by Daiwa Anglo–Japanese Foundation, Research Project Grants-in-aid for Scientific Research No. 17590865 (R.H.) and No. 18590928 (Y.T.) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, grants for the Research Committee on rTMS Treatment of Movement Disorders from the Ministry of Health and Welfare of Japan (17231401), the Research Committee on Dystonia, the Ministry of Health and Welfare of Japan, a grant from the Committee of the study of Human Exposure to EMF from the Ministry of Public Management, Home Affairs, Post and Telecommunications, and grants from the Life Science Foundation of Japan.
PY - 2009/4
Y1 - 2009/4
N2 - Objective: The aim of this paper is to develop a reliable method for supramaximal magnetic spinal motor root stimulation (MRS) for lower limb muscles using a specially devised coil. Methods: For this study, 42 healthy subjects were recruited. A 20-cm diameter coil designated as a Magnetic Augmented Translumbosacral Stimulation (MATS) coil was used. Compound muscle action potentials (CMAPs) were recorded from the abductor hallucis muscle. Their CMAPs were compared with those obtained by MRS using a conventional round or double coil and with those obtained using high-voltage electrical stimulation. Results: The MATS coil evoked CMAPs to supramaximal stimulation in 80 of 84 muscles, although round and double coils elicited supramaximal CMAPs in only 15 and 18 of 84 muscles, respectively. The CMAP size to the MATS coil stimulation was the same as that to high-voltage electrical motor root stimulation. Conclusions: MATS coil achieved supramaximal stimulation of the lumbosacral spinal nerves. Significance: The CMAPs to supramaximal stimulation are necessary for measurement of the amplitude and area for the detection of conduction blocks. The MATS coil stimulation of lumbosacral motor roots is a reliable method for measuring the CMAP size from lower limb muscles in spinal motor root stimulation.
AB - Objective: The aim of this paper is to develop a reliable method for supramaximal magnetic spinal motor root stimulation (MRS) for lower limb muscles using a specially devised coil. Methods: For this study, 42 healthy subjects were recruited. A 20-cm diameter coil designated as a Magnetic Augmented Translumbosacral Stimulation (MATS) coil was used. Compound muscle action potentials (CMAPs) were recorded from the abductor hallucis muscle. Their CMAPs were compared with those obtained by MRS using a conventional round or double coil and with those obtained using high-voltage electrical stimulation. Results: The MATS coil evoked CMAPs to supramaximal stimulation in 80 of 84 muscles, although round and double coils elicited supramaximal CMAPs in only 15 and 18 of 84 muscles, respectively. The CMAP size to the MATS coil stimulation was the same as that to high-voltage electrical motor root stimulation. Conclusions: MATS coil achieved supramaximal stimulation of the lumbosacral spinal nerves. Significance: The CMAPs to supramaximal stimulation are necessary for measurement of the amplitude and area for the detection of conduction blocks. The MATS coil stimulation of lumbosacral motor roots is a reliable method for measuring the CMAP size from lower limb muscles in spinal motor root stimulation.
KW - Compound muscle action potential
KW - Magnetic stimulation
KW - Motor-evoked potential
KW - Peripheral nerve
UR - http://www.scopus.com/inward/record.url?scp=63549108402&partnerID=8YFLogxK
U2 - 10.1016/j.clinph.2009.01.004
DO - 10.1016/j.clinph.2009.01.004
M3 - Article
C2 - 19231278
AN - SCOPUS:63549108402
SN - 1388-2457
VL - 120
SP - 770
EP - 775
JO - Clinical Neurophysiology
JF - Clinical Neurophysiology
IS - 4
ER -