Supramaximal responses can be elicited in hand muscles by magnetic stimulation of the cervical motor roots

Brain Stimulation
Lumine MatsumotoYoshikazu Ugawa

Abstract

The amplitude of compound muscle action potentials (CMAPs) evoked in response to magnetic cervical motor root stimulation (MRS) has rarely been used as a diagnostic parameter because of the difficulty in obtaining supramaximal CMAPs. To clarify whether supramaximal CMAPs could be elicited by MRS, and if so, whether their amplitude and area could be used to evaluate the conduction of proximal motor roots. With the use of a custom-made high-power magnetic stimulator, the CMAPs evoked in response to MRS of the first dorsal interosseous, abductor digiti minimi, and abductor pollicis brevis (APB) muscles were compared with those evoked by electrical stimulation at the wrist, brachial plexus, and cervical motor roots. The collision technique was also used to exclude volume conduction. The correlation between MRS-induced CMAP latency and body height was evaluated. In 32 of 36 normal subjects, supramaximal CMAPs were obtained in response to MRS. The size of CMAPs occurring in response to MRS was the same as the size of those occurring in response to high-voltage electrical cervical motor root stimulation. The collision technique revealed that the APB muscle was highly contaminated by volume conduction from adjacent muscles. CMAP latenc...Continue Reading

References

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Citations

Mar 15, 2013·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Hideyuki MatsumotoYoshikazu Ugawa
May 4, 2011·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Yuichiro ShirotaYoshikazu Ugawa
May 15, 2015·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Hideyuki Matsumoto, Yoshikazu Ugawa
Jul 29, 2015·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Dimitra Veltsista, Elisabeth Chroni
Jul 3, 2013·Journal of the Neurological Sciences·Hideyuki MatsumotoYoshikazu Ugawa
Nov 8, 2014·The Journal of Physiological Sciences : JPS·Hideyuki MatsumotoYoshitaka Ishibashi
Jul 14, 2012·Rinshō shinkeigaku = Clinical neurology·Shoji HemmiYoshihide Sunada

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