electromyography
Pronunciation: ih-lek-troh-my-OG-rah-fee
A diagnostic procedure that evaluates the electrical activity of muscles and the nerves controlling them.
Full Definition
Electromyography (EMG) is a neurophysiological technique that records and analyzes the electrical signals produced by skeletal muscles during contraction and at rest. The procedure involves inserting needle electrodes into specific muscles to detect abnormal electrical activity that may indicate nerve damage, muscle disorders, or problems with nerve-muscle communication. EMG is often performed in conjunction with nerve conduction studies to provide a comprehensive assessment of the peripheral nervous system. The test helps diagnose conditions such as carpal tunnel syndrome, muscular dystrophy, amyotrophic lateral sclerosis, and peripheral neuropathies.
Usage
Usage note: Always specify whether referring to needle EMG or surface EMG in technical documentation.
In Context
- "Electromyography demonstrated denervation changes in the affected muscle groups." — Neurophysiology report
- "The patient requires electromyography to evaluate suspected peripheral nerve injury." — Referral documentation