Diagnostic Electromyography

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Abstract
Electromyography enables the physician to detect and characterize small changes within a patient's neuromyal system. The results of this objective examination can provide useful information about a patient showing any degree of weakness from damage to elements of the motor unit. Sometimes abnormal sensations, such as pain, numbness, or paresthesia, obscure the underlying motor involvement; in these cases, electromyographic studies may clarify the problem. Indications Electromyography assists in differentiating lower motor-neuron disease from primary muscle disease; it also facilitates differentiation of any one type of lower motor-neuron disease or any one myopathy from others in the same disease category. The technique is particularly helpful in localizing lower motor-neuron lesions to the distribution of a peripheral nerve, a portion of a peripheral nerve, a plexus in whole or in part, a motor nerve root, or generalized involvement. In many instances the processes of peripheral-nerve degeneration and regeneration can be monitored electromyographically

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