An electromyogram (EMG) is a test that records the electrical activity of muscles. A neurologist may perform an EMG to locate the source for any unexplained muscle weakness. By examining the electrical activity, the physiscian can deduce whether the muscle weakness is due to any nerve disorders.
Abnormal electrical activity may point to diseases that damage the muscle tissue or nerves. It may help with diagnosis for any of the following:
- Muscular dystrophy
- Peripheral Neuropathy
- Muscle Inflammation
- Pinched Nerve
- Amyotrophic lateral sclerosis (ALS)
- Myasthenia gravis (MG)
- Carpal tunnel and related nerve compressions
To perform an EMG test, a needle is inserted through the skin and into the muscle. The patient may be asked to contract the muscle to demonstrate electrical activity. The needle detects this, and the results are recorded visually on an oscilloscope. The doctor can then examine the results and determine if the muscle is responding to nerve stimulation normally.
To learn more about EMG testing, contact the Neurology Center at 713-795-0074.