For example, if the biceps muscles are being assessed, then the patient will be asked to flex their arms. Then the patient will be asked to contract the muscles. Once the needles are in place, a reading will be taken with the muscle at rest. Usually, multiple needles need to be inserted into large muscles. This helps the doctor visualize the electrical impulses as a wave form. A tiny needle that serves as an electrode is inserted into the muscle in question, and is connected to a device called an oscilloscope. The procedure is performed as an outpatient. Other conditions where it may be used include carpal tunnel syndrome, inherited muscle dystrophies, peripheral neuropathy and alcoholic neuropathy. It can point the doctor towards a diagnosis so that the right treatment can be administered. The main reason to perform this test is to investigate the reason for muscle weakness. IndicationsĮlectromyography is used to diagnose neuromuscular conditions such as myasthenia gravis, muscular dystrophy and amyotropic lateral sclerosis.

Electromyography can help detect abnormal muscle electrical activity, which can help diagnose problems with the muscle tissues. Normally, when muscles contract, they generate a burst of electrical activity. Electromyography (also called EMG) is a diagnostic test that assesses the function of the muscles and the nerves that supply the muscles and control its function.

Emg test lumbar spine