Question: What Does An Abnormal EMG Look Like?

What conditions can an EMG diagnose?

An EMG can be used to diagnose a wide variety of neuromuscular diseases, motor problems, nerve injuries, or degenerative conditions, such as:Amyotrophic lateral sclerosis (ALS)Carpal tunnel syndrome.Cervical spondylosis.Guillain-Barre syndrome.Lambert-Eaton syndrome.Muscular dystrophy.Myasthenia gravis.More items….

What does a normal nerve conduction test rule out?

NCV tests can measure the speed and strength of nerve signals. Nerve conduction velocity between 50 to 60 meters per second is considered normal. A damaged nerve may send a slower and weaker signal than a healthy one. It is possible to have normal results even if a person has nerve damage.

Does nerve damage show up on MRI?

MRI is sensitive to changes in cartilage and bone structure resulting from injury, disease, or aging. It can detect herniated discs, pinched nerves, spinal tumors, spinal cord compression, and fractures.

What medications affect EMG results?

About ElectromyographyAre taking any drugs. Certain drugs that act on the nervous system (such as muscle relaxants) can interfere with electromyography results. … Have had bleeding problems or are taking blood thinning drugs, such as warfarin (Coumadin®) or heparin.Have a pacemaker.

What happens if EMG is abnormal?

If your EMG shows abnormal electrical activity when a muscle contracts, then you may have a herniated disc or a nerve disorder, such as ALS or carpal tunnel syndrome. Depending on your results, your doctor will talk to you about any additional tests or treatments that might be needed.

What does an EMG feel like?

There is some discomfort at the time the needle electrodes are inserted. They feel like shots (intramuscular injections), although nothing is injected during an EMG. Afterwards, the muscle may feel a little sore for up to a few days.

Can I eat before an EMG test?

Do not eat or drink foods that contain caffeine (such as coffee, tea, cola, and chocolate) for 2 to 3 hours before the test. Wear loose-fitting clothing so your muscles and nerves can be tested. You may be given a hospital gown to wear. Take a shower or bath before your exam to remove oils from your skin.

How does a neurologist check for nerve damage?

By measuring the electrical activity they are able to determine if there is nerve damage, the extent of the damage and potentially the cause of the damage. Frequently the neurologist will recommend common, noninvasive neurological evaluations such as electromyography (EMG) and nerve conduction velocity (NCV) testing.

Does caffeine affect EMG test?

Preparing the patient for EMG Instruct your patient to avoid caffeine and tobacco products for 3 hours before the test, as these substances can affect test results. Also advise her to wear loose-fitting clothes the day of the test.

How do you prepare for an EMG?

To prepare for an EMG, please do the following:Bathe or shower on the day of the test; wash arms and legs well to remove body oils.Don’t use lotion, bath oils or creams.Wear comfortable, loose-fitting clothes, and remember to bring shorts and a short-sleeved or sleeveless shirt.More items…

Why would someone need an EMG?

EMG results are often necessary to help diagnose or rule out a number of conditions such as: Muscle disorders, such as muscular dystrophy or polymyositis. Diseases affecting the connection between the nerve and the muscle, such as myasthenia gravis.

What does a normal EMG sound like?

The sound of positive sharp waves have been described as, like ‘claps of distant thunder’, and fibrillation potentials a higher pitched and shorter duration sound, like ‘rain on a tin roof’.

Does EMG show neuropathy?

EMG and NCS are tests that measure the electrical activity of the muscles and nerves of the body, usually to an arm or a leg. The tests can help identify nerve injury or muscle disease such as carpal tunnel syndrome, a pinched spinal nerve, peripheral neuropathy, myositis, or ALS.

Can you see nerve damage on a CT scan?

A CT scan will highlight any problems with bone and tissue, but they won’t help much in determining nerve damage. X-rays, also, are not very effective in picking up neural subtleties, but they will show if there is a break, fracture, or if something is out of place in the musculoskeletal system.

What diseases does a nerve conduction test show?

Diseases or conditions that may be checked with NCV include:Guillain-Barré syndrome. … Carpal tunnel syndrome. … Charcot-Marie-Tooth disease. … Herniated disk disease. … Chronic inflammatory polyneuropathy and neuropathy. … Sciatic nerve problems.

How long does it take to get EMG results?

EMG testing usually takes anywhere from 30 to 90 minutes, depending on the condition being tested and findings of the study. A report that includes the results and an interpretation will be sent to your doctor.

Can I drive home after EMG?

You may need to stay in the outpatient facility or hospital for a short period after your EMG. Your team will apply warm compresses to your injection sites to reduce pain. You will not be able to drive for about 24 hours if you had sedation because you will still be drowsy.

How does nerve damage feel?

Nerve damage may cause loss of sensation or numbness in the fingertips, making it harder to do things with your hands. Knitting, typing, and tying your shoes may become difficult. Many people with nerve damage say that their sense of touch feels dulled, as if they are always wearing gloves.

How much does EMG cost?

The tests can be expensive. An EMG or NCS may cost from $150 to $500.

Can you have a normal EMG and still have nerve damage?

Like any diagnostic procedure or test, EMG is not perfect. A normal result does not mean a patient does not have a deficit in their nerve or muscle. Whether median neuropathy at the wrist or carpal tunnel syndrome are present is the most referred question for EMG.