To check for a nerve blockage, doctors primarily use two tests: electromyography (EMG) and nerve conduction velocity (NCV) tests. These tests help determine how well your nerves are transmitting electrical signals.
Electromyography (EMG)
An EMG assesses the electrical activity of your muscles. Here's what it involves:
- Procedure: A thin needle electrode is inserted into the muscle.
- Measurement: The EMG records the electrical activity when the muscle is at rest and when it's contracting.
- Interpretation: Abnormal electrical activity can indicate nerve damage or muscle dysfunction. Specifically, it can help pinpoint the location and severity of a nerve blockage.
Nerve Conduction Velocity (NCV) Test
The NCV test measures how quickly electrical impulses travel along a nerve.
- Procedure: Electrodes are placed on the skin over the nerve being studied. A mild electrical impulse is then applied.
- Measurement: The test measures the speed at which the electrical impulse travels between the electrodes.
- Interpretation: A slower-than-normal nerve conduction velocity can indicate nerve damage or a blockage. The test can help determine the location and extent of the blockage.
What to Expect
Both tests are typically performed by a neurologist or a trained technician. While they might cause some mild discomfort, they are generally safe. The results of these tests, combined with a physical examination and your medical history, will help your doctor determine the cause and severity of any nerve blockage.
