How Does The Nerve Conduction Test Results Interpretation Work
Also referred as the NCV test or examination is used for the understanding and determining of the nerve damage. The test examines the pace of the electrical signal movement through the peripheral nerves of the human body. The nerve conduction test results interpretation can determine any damaged peripheral nerve situated outside the brain and along the spinal cord.
It is the peripheral nerves that have control over your muscles and also aids you to experience the sense. When the nerves are healthy, they will send electrical signals more quickly and rapidly with excellent strength as compared to dysfunction or damaged nerves. The nerve conduction test results interpretation has proved to help to the doctors to distinguish between a nerve disorder and a nerve injury affecting the muscles. Making out the difference is vital because the doctor can diagnose and render the proper treatment course.
Will I Need To Do Anything To Prepare For These Tests
Tell your health care provider if you have a pacemaker or cardiac defibrillator. Special steps will need to be taken before the test if you have one of these devices.
Wear loose, comfortable clothing that allows easy access to the test area or can be easily removed if you need to change into a hospital gown.
Make sure your skin is clean. Don’t use lotions, creams, or perfumes for a day or two before the test.
What Do The Results Mean
If your results were not normal, it can indicate a variety of different conditions. Depending on which muscles or nerves are affected, it may mean one of the following:
- Carpal tunnel syndrome, a condition that affects nerves in the hand and arm. It’s usually not serious, but can be painful.
- Herniated disc, a condition that happens when a part of your spine, called a disc, is damaged. This puts pressure on the spine, causing pain and numbness
- , an autoimmune disorder that affects the nerves. It can lead to numbness, tingling, and paralysis. Most people recover from the disorder after treatment
- Myasthenia gravis, a rare disorder that causes muscle fatigue and weakness.
- Muscular dystrophy, an inherited disease that seriously affects muscle structure and function.
- Charcot-Marie-Tooth disease, an inherited disorder that causes nerve damage, mostly in the arms and legs.
- Amyotrophic lateral sclerosis , also known as Lou Gehrig’s disease. This is a progressive, ultimately fatal, disorder that attacks nerve cells in your brain and spinal cord. It affects all the muscles you use to move, speak, eat, and breathe.
If you have questions about your results, talk to your health care provider.
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Who Is An Eligible Candidate For This Ncv Test
It can diagnose and rule out certain conditions, including demyelinating or peripheral neuropathies. The test benefits patients with diabetes, dialysis, or who have had chemotherapy or radiation.
Other patients for which the test is suitable to include those with HIV infection, multiple sclerosis, or Lyme disease. However, if it is suspected that the patient may have multiple sclerosis, a magnetic resonance imaging scan may be ordered.
How Is An Intramuscular Emg Done
A needle is inserted through the skin into the muscle. The electrical activity is detected by this needle . The activity is displayed visually on an oscilloscope and may also be detected audibly with a speaker.
Since skeletal muscles are often large, several needle electrodes may need to be placed at various locations to obtain an informative EMG.
After placement of the electrode, the patient may be asked to contract the muscle .
The presence, size, and shape of the wave form produced on the oscilloscope provide information about the ability of the muscle to respond to nervous stimulation. Each muscle fiber that contracts produces an action potential. The size of the muscle fiber affects the rate and the size of the action potential.
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What Are They Testing For
EMG testing is done to investigate the health of your nerves and muscles. There are a large number of different nerve problems which can be tested for, so we cannot be more specific here. Your referring physician is best qualified to answer any specific questions you have regarding the reason for your referral.
What Are The Risks Of Ncv Tests
The voltage of the electrical pulses used during an NCV is considered verylow.
Risks depend on your specific medical condition. Be sure to discuss anyconcerns with your healthcare provider before the procedure.
Certain factors or conditions may interfere with the results of NCV tests.This includes damage to the spinal cord, severe pain before the test, andbody temperature.
Tell your healthcare provider if you have a cardiac defibrillator orpacemaker, as precautions may need to be taken.
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Can You Be Sedated For An Emg
It is unusual that sufferers need sedation. If you feel you need one thing, Valium or one among its family members, , is generally prescribed. You need to be conscious for the procedure, so whatever you’re taking must allow you to be comfortable and now not asleep. Plan on resuming standard actions after the procedure.
How Should I Prepare For The Test
You can eat normally the day of the test. Take your prescribed medications unless otherwise instructed. Do not use any lotions or powders on the area to be tested. Dress in loose clothes that permit access to the area to be tested or that are easily removed. Testing typically takes 30 to 60 minutes.
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What Are Electromyography And Nerve Conduction Studies
Electromyography and nerve conduction studies are tests that measure the electrical activity of muscles and nerves. Nerves send out electrical signals to make your muscles react in certain ways. As your muscles react, they give off these signals, which can then be measured.
- An EMG test looks at the electrical signals your muscles make when they are at rest and when they are being used.
- A nerve conduction study measures how fast and how well the body’s electrical signals travel down your nerves.
Other names: electrodiagnostic study, EMG test, electromyogram, NCS, nerve conduction velocity, NCV
What Can Emg Diagnose
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.6 The challenge of assessing sensitivity and specificity for any diagnosis is what to consider the gold standard, and typically, this is clinical suspicion or exam findings. In median neuropathy, when compared to the clinical criteria of carpal tunnel, 25% of patients in a study did not have findings of median neuropathy at the wrist by EMG.19 Therefore, it is useful to consider what a test will add to management of an individual patient. It is likely that for carpal tunnel, if a patient meets clinical diagnosis, further testing is not immediately necessary. However, for patients who only meet partial clinical criteria or if a clinician is debating an alternative diagnosis, the test may indeed be quite warranted and useful .
Figure 2: The electrophysiologic results of all patients referred to one academic hospital’s neurodiagnostic lab broken into whether patient symptoms included pain or not .
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About Spinal Diagnostics: Nerve Conduction Studies
A nerve conduction study is usually done along with electromyography . The nerve conduction study stimulates specific nerves and records their ability to send the impulse to the muscle. The study can show where there is a blockage of the nerve pathway.Nerve conduction studies are done to:
- Find and evaluate damage to all the nerves that lead away from the brain and spinal cord to the smaller nerves that branch out from them
- Help diagnose nerve disorders, such as carpal tunnel syndrome or Guillain-Barré syndrome
- Find the location of abnormal sensations, such as numbness, tingling or pain
Is An Emg Or Nerve Conduction Test Painful
Your technician or doctor will make every effort to minimize any discomfort you may experience. Most patients do not experience significant discomfort or side effects.
- Nerve conduction study: These feel like static electricity or like a rubber band slapping against your skin. You may feel your muscles twitch.
- EMG study: You may feel some discomfort or pain when the doctor inserts the needle into the muscle.
- Potential side effects: There may be bruising and/or soreness of the muscle for one or two days after the test.
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What Exactly Is An Emg Test
An EMG test is a detailed investigation of the health of your peripheral nervous system . There are 2 parts to the test, nerve conduction testing, and an optional needle exam . In the nerve conduction studies , various nerves, usually in the arm or leg, will be stimulated with a small, harmless electrical pulse. The response from your nerve is recorded by an EMG machine. By testing a number of nerves, a generalized assessment of your peripheral nerves and muscles can be made. A number of specific localized problems such as Carpal Tunnel Syndrome, Bell’s Palsy, Myasthenia Gravis, and many others can also be tested using NCS techniques.
For further general information, see our EMG informational pamphlet.
When You Might Need A Test
Neck or back pain can cause numbness, tingling, pain, or weakness in your arm or leg. This is usually the result of a pinched or irritated nerve.
In most cases, these symptoms go away on their own. But if they are severe or continue for a while, you may need an electrodiagnostic test. These tests can:
- Help find the cause of your problem.
- Show your doctor how serious the problem is.
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What Are Nerve Conduction Studies & Electromyography
Nerve conduction studies are electrical tests which involve the stimulation of nerves along several points . Surface electrodes are used to deliver and detect the electrical impulses.
The strength of the impulse and the speed at which it travels are examples of a number of characteristics measured. EMG is often done at the same time, and is a way of recording the electrical activity produced by muscles.
What Is Emg Testing
Electromyography is a form of electrodiagnostic testing that is used to study nerve and muscle function. It is commonly performed by a physiatrist or neurologist with special training for this procedure. An EMG nerve test can provide your doctor with specific information about the extent of nerve and/or muscle injury and can also determine the exact location of injury and give some indication whether the damage is reversible.
There are actually two parts to EMG:
In most cases, your doctor will perform both elements, but in some situations, only one or the other may be done.
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Best Clinic To Get A Nerve Conduction Velocity Test In Greenville And Dallas
Nerve conduction velocity test in Greenville and Dallas
When looking for the best hospitals to get a Nerve conduction test in Greenville and Dallas, you will want to consider Elite Primary care. This facility is known for its excellent care and its ability to provide the best possible tests for its patients. The staff at the Elite primary care is highly trained and experienced in performing these types of tests, and they will be able to provide you with the best possible care.
Nerve Conduction Velocity Test
A nerve conduction velocity test is an electrical test that is used to determine the adequacy of the conduction of the nerve impulse as it courses down a nerve. This test is used to detect signs of nerve injury.
In this test, the nerve is electrically stimulated, and the electrical impulse ‘down stream’ from the stimulus is measured.
Yes. There is some discomfort at the time the needle electrodes are inserted. They feel like shots , although nothing is injected during an EMG. Afterwards, the muscle may feel a little sore for up to a few days.
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Questions To Ask Your Doctor
Making a list of questions can help you remember everything you want to ask your doctor before nerve conduction testing. Questions you may want to ask include:
Why do I need a nerve conduction test?
What information will you get from a nerve conduction test?
How many nerves do you need to test?
How long will the testing take?
Will you also do an EMG?
How and when will I get the results?
What other testing or procedures might I need?
There Are Situations When You Might Not Need The Tests:
- Back or neck pain after a car accident. You may not need an EMGunless you have pain, tingling, weakness, or numbness in your arm or leg.
- Testing each arm or leg. You rarely need to get an EMG test on each arm or leg.
- A pinched nerve in the neck or back. Some studies suggest that a dermatomal SEP gives information that is not accurate. The test has not been proven to help, so your insurance may not cover it. Also, if you have a pinched nerve, dont get an NCS without an EMG. An NCS without an EMG can lead to the wrong diagnosis.
This report is for you to use when talking with your health-care provider. It is not a substitute for medical advice and treatment. Use of this report is at your own risk.
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What Are They Used For
EMG and nerve conduction studies are used to help diagnose a variety of muscle and nerve disorders. An EMG test helps find out if muscles are responding the right way to nerve signals. Nerve conduction studies help diagnose nerve damage or disease. When EMG tests and nerve conduction studies are done together, it helps providers tell if your symptoms are caused by a muscle disorder or a nerve problem.
Where Is The Emg Lab In The Hospital
The EMG Lab is on the 7th floor of University Hospital. When you arrive for your appointment, after checking in at Patient Registration on the main floor, go to the 7th floor Outpatient Department. The receptionist will notify the EMG Lab that you have arrived.
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What Are The Side Effects / Risks
EMG and NCS tests have few side effects. Occasionally, the pin exam can cause a small bruise. This is more common in patients on blood thinners or anti-inflammatory drugs . Infection at the pin sites is rare, given the skins natural defenses and the small pin size. You may feel some soreness for a day or two following the test. There are no activity restrictions, and you can drive home afterwards. The tests are safe and can be performed in people with pacemakers or defibrillators.
How Do I Prepare
Talk to your doctor about any medical conditions you have before the nerve conduction study or EMG test.
Follow your doctors instructions to prepare for your procedure:
- Tell your doctor if you use a cardiac defibrillator or pacemaker, because the test can interfere with these devices.
- Your doctor may ask you to avoid caffeine and nicotine, because these drugs can interfere with the test results.
- Do not use lotion or cream on the day of the test. These can interfere with the gel that is used to attach the electrodes.
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What Conditions Do They Diagnose Or What Can They Detect
These tests can diagnose the following disorders:
Guillain-Barré syndrome: In this disorder, peripheral nervous system is impacted and attacked by the bodys immune system.
Charcot-Marie-Tooth disease: A hereditary condition where both motor and sensory nerves are affected.
Herniated disk disease: In this disease, the fibrous cartilage around the disks of vertebrae collapses. This causes the gelatinous substance to breakout from the disk, which further pressurises the spinal cord.
Chronic inflammatory polyneuropathy and neuropathy: This disorder can result from alcohol consumption or diabetes.
Sciatic nerve problems: This can be due to the rupturing of the spinal disk, thereby adding pressure on nerve roots.
How Do I Prepare For A Nerve Conduction Test
Nerve conduction testing does not require much preparation. Do not use oils, lotions, moisturizers, sunscreen or colognes or perfumes the day of your test. Your doctor may ask you to avoid these products for a few days before your test.
Be sure to tell your doctor about all your medications. This includes prescriptions, over-the-counter drugs, herbal products, and supplements.
Also, its important to know you must stay at a normal body temperature during the test. Being cold can slow nerve conduction. If you feel chilled, let your doctor know.
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What Are Indicators Of Nerve Damage
The indicators of nerve damage
- Numbness or tingling in the arms and ft.
- Feeling like you are dressed in a tight glove or sock.
- Muscle weakness, especially to your arms or legs.
- Regularly shedding items that you’re maintaining.
- Sharp pains in your arms, palms, legs, or ft.
- A humming sensation that seems like a gentle electrical shock.