However, due to the use of needles, there is a small risk of developing an infection, bleeding, or nerve injury at the site where the electrodes are inserted. The more forceful the muscle contractions, the more waves that will be observed on the oscilloscope.Įlectromyography is an outpatient procedure that generally does not pose any risks or side effects. The shape and size of the waves that are observed on the oscilloscope provide the specialist with information regarding the muscle’s ability to react when it is stimulated by nerves. The activity can also be heard through the use of an audio-amplifier. The electrodes transmit the electrical activity in the form of waves to an oscilloscope, which is the monitor that the recorded activity is displayed on. Electrical signals are not produced when muscle tissue is at rest and this helps ensure that the electromyograph is not producing false readings. After the electrodes are in place, the patient may be requested to engage in movements that cause the muscles to slightly contract and forcefully contract, but measurements are also made while the muscles are at rest. In some cases, up to five or more needles may need to be inserted in order to conduct the test. A ground electrode is also placed under either the arm or the leg. How Is Electromyography Performed?Įlectromyography involves inserting one or more thin needle electrodes directly into a patient’s muscle tissue in order to record its electrical activity. The results of electromyography can reveal muscle or nerve dysfunction as well as problems with the transmission of signals from the motor neurons to the muscles. However, a highly-trained technician may also perform the procedure. The information can then be interpreted by a specialist, usually a neurologist, as this type of physician specializes in the brain, spinal cord, and nerve disorders. An electromyography records the signals and converts them into information that is displayed on a monitor.

Specific nerve cells called motor neurons transmit signals that cause muscles to stretch and contract.

In particular, if it is believed that a certain spinal condition is disrupting the signal transmission from nerves within the spinal cord that are responsible for controlling muscles then electromyography will be performed. Electromyography (EMG) is a diagnostic test that is commonly used by physicians who want to evaluate the health of muscle tissue as well as the motor neurons (nerve cells) that regulate muscle activity.

Emg cervical spine