Laryngeal EMG (Electromyography) 


This test is useful in assessing patients with vocal cord paralysis and other vocal cord disorders. The electrical activity generated by the muscles that move the vocal cords is measured to see if they are functioning normally or if there is any interruption of the nerve supply.


Reference and earth surface electrodes are placed on either side of the voice box and connected to a computer which monitors muscle activity. Small insulated electrodes are then placed in the laryngeal muscles and the spontaneous and active electrical responses are recorded at rest and on phonation. The test should take about 20 minutes.