Source:Clinical Neurophysiology, Volume 129, Issue 5
Author(s): Kazuto Akaboshi
I think that many physicians feel "needle electromyography is interesting?" But it is interesting if you can understand and boring if you can not. For that, it is important to know the meaning of electromyogram waveform. Since any of these waveforms is a potential originating from the muscle fibers, it is natural that the appearances are similar, and experts can not judge only by that "shape". They judge based on the rhythm of the waveform and muscular strength. It is important to know the characteristics of the waveform, for example, whether the waveform originates from one muscle fiber, whether it is firing as a motor unit, or a potential arising from multiple muscle fibers not related to motor units. It is also important to know whether the potential is generated by voluntary muscle contraction, irrelevant to muscle contraction or induced by needle sticking. For example, there are fibrillation potentials, positive sharp waves, and myotonic discharges as potentials to be generated from one muscle fiber, and the motion unit potential and the fasciculation potential are potentials generated from the motion unit. In this presentation, we will briefly describe other potentials and clinical points.
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