What Can Affect A Nerve Conduction Study?

What affects nerve conduction?

Conduction velocities are affected by a wide array of factors, including age, sex, and various medical conditions.

Studies allow for better diagnoses of various neuropathies, especially demyelinating diseases as these conditions result in reduced or non-existent conduction velocities..

What medications affect nerve conduction study?

Certain drugs that act on the nervous system (such as muscle relaxants) can interfere with electromyography results. You may need to stop taking these three to six days before the test. Have had bleeding problems or are taking blood thinning drugs, such as warfarin (Coumadin®) or heparin.

What causes abnormal nerve conduction test?

Nerve conduction velocities also tend to decrease as a person gets older. Slower conduction velocities may also be caused by injury or damage to a nerve (such as carpal tunnel syndrome) or group of nerves (such as Guillain-Barré syndrome or post-polio syndrome).

What are the signs of nerve damage?

The signs of nerve damage include the following:Numbness or tingling in the hands and feet.Feeling like you’re wearing a tight glove or sock.Muscle weakness, especially in your arms or legs.Regularly dropping objects that you’re holding.Sharp pains in your hands, arms, legs, or feet.More items…

Why was my EMG so painful?

The Pain of an EMG. Pain is the most common complication of EMG2 causing some level of discomfort in all patients either from the nerve conduction portion or the needle examination. Most surveys find pain more common in the needle portion.

What does an abnormal nerve conduction study mean?

This shows up as an abnormal action potential pattern with changes in the size or shape of the wave. Abnormal EMG results may indicate muscle damage or a problem with the nerves that control the muscle.

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.

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 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.

Will an MRI show nerve damage?

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.

How do you treat nerve damage?

How Are Nerve Pain and Nerve Damage Treated?Regulating blood sugar levels for people with diabetes.Correcting nutritional deficiencies.Changing medications when drugs are causing nerve damage.Physical therapy or surgery to address compression or trauma to nerves.Medications to treat autoimmune conditions.

How bad can neuropathy get?

If the underlying cause of peripheral neuropathy isn’t treated, you may be at risk of developing potentially serious complications, such as a foot ulcer that becomes infected. This can lead to gangrene (tissue death) if untreated, and in severe cases may mean the affected foot has to be amputated.

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.

How long does it take to get the results of a nerve conduction test?

An EMG may take 30 to 60 minutes. Nerve conduction tests may take from 15 minutes to 1 hour or more. It depends on how many nerves and muscles your doctor tests.

How painful is a nerve conduction study?

You may feel some discomfort depending on how strong the impulse is. You should feel no pain once the test is finished. Often, the nerve conduction test is followed by electromyography (EMG). In this test, a needle is placed into a muscle and you are told to contract that muscle.