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One of the fundamental principles of electrodiagnostic medicine is the assessment of the peripheral nervous system's ability to conduct an electrical impulse. Nerve conduction studies (NCs) and needle electromyography (EMG), are commonly referred to as electrodiagnostic or EMG studies. The primary goals of the EMG study are to localize the lesion, characterize the underlying nerve pathophysiology, quantitate the severity of the lesion, and assess the temporal course of the disorder. Weakness can be secondary to a lesion in the upper motor neuron pool or within the lower motor neuron pool. Some patients may, in the course of their rehabilitation, develop a pattern of proximal weakness. This weakness usually begins in the lower extremities and then progresses to involve the proximal arms. Surface EMG (SEMG) can provide a simple, noninvasive method to assess the activation of muscles involved in performing specific tasks.
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