Electromyography (EMG) measures muscle response or electrical activity in response to a nerveâs stimulation of the muscle.The test is used to help detect neuromuscular abnormalities. During the test, one or more small needles (also called electrodes) are inserted through the skin into the muscle.n audio-amplifier is used so the activity can be heard.EMG measures the electrical activity of muscle during rest, slight contraction and forceful contraction. Muscle tissue does not normally produce electrical signals during rest.
Respiratory muscle weakness should be considered in patients whose dyspnea cannot be explained by pulmonary disease, cardiac disease, anemia, or deconditioning.First symptoms may occur when respiratory muscles are under increased load, such as when standing in deep water, swimming, or in the supine position.yspnea is common in advanced stages of neuromuscular disorders, but it is infrequently the presenting symptom. However, dyspnea is a frequent complaint in a primary care setting but is rarely caused by a respiratory muscle weakness.
Myasthenia gravis is a neuromuscular disorder that causes weakness and fatigue in the muscles that control voluntary movement in the body.The weakness is caused by a disruption in the communication between the muscles and the nerves that control them.hile myasthenia gravis can affect any voluntary muscles in the body, most patients will first notice its effects in the muscles that control the movement of the eyes and eyelids. The weakening of these muscles can result in droopy eyelids, double vision and partial paralysis of eye movements.