Electrodiagnostic medicine is the study of nerve and muscle disease by measuring muscle electrical activity. When muscles are active, they produce an electrical current. Electromyography (EMG) testing will help the neurologist see if your muscles and nerves are working correctly. The results of the test will help your doctor take the necessary steps in treating you.
An EMG test can detect diseases and conditions such as carpal tunnel syndrome, neuropathy, radiculopathy, muscular dystrophy, inflammation of muscles, pinched nerves, peripheral nerve damage, amyotrophic lateral sclerosis (ALS), myasthenia gravis, herniated discs, and others. An EMG is often performed when patients have muscle weakness, numbness, tingling, pain, burning sensation and/or muscle cramping. In diagnosing your symptoms, the physician might use nerve conduction studies or needle EMG.
Normal results of electromyography indicate that healthy muscles produce no electrical activity at rest. Electrical activity increase as muscles contract. The test produces no side effects and patients can return to all normal activities after the test.
Please refer to our EMG handout to prepare for your test.
An electroencephalogram (EEG) is a diagnostic test that is used to detect electrical activity problems in the brain. Brain cells communicated with each other by producing tiny electrical impulses. An EEG is used to help diagnose seizures and other related neurological conditions such as the following: sleep disorders, periods of unconsciousness, headaches, dizzy spells, fainting spells (syncope/blackouts), head injuries, brain tumors and infections, transient ischemic attack (TIA), abnormal changes in body and brain chemistry, strokes and degenerative diseases such as Alzheimer’s disease.
The test is performed by our board certified, registered electroencephalographic technologist (R. EEG T.) Before the test, the technologist will apply 16-25 flat metal disks (electrodes) on your scalp in different positions. The disks are held in place with a sticky paste. The electrodes are connected by wires to an amplifier and a recording machine that will transmit the brain activity to a computer screen. This information will help the doctor formulate an EEG report. The test is performed while you are in a reclining chair. The test may include hyperventilation (breathing deeply and rapidly) for 3 to 5 minutes and/or looking at a bright, flashing light. Once the test is over you may return to your normal daily activities.
This test causes no discomfort or side effects. Although having electrodes pasted onto your skin may feel strange, the electrodes only record brain activity and do not produce any sensation.