Accurate EMG leads to good treatments

Abstract

EMG is widely used for the diagnosis of neuromuscular disease. However misunderstandings of its principals lead to wrong diagnosis. In this lecture, I emphasized several basic concepts of EMG ; (1) Action potential in a volume conductor is recorded as a triphasic wave, (2) Fibrillation potential, positive sharp wave and fasciculation potential are very important spontaneous activities to evaluate disease activity, (3) Regional muscle fiber density of a MU effects largely on the MUP waveform.