trigeminal neuralgia

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Overview

Trigeminal neuralgia is an inflammation of the trigeminal nerve causing extreme pain and muscle spasms in the face. Attacks of intense, electric shock-like facial pain can occur without warning or be triggered by touching specific areas of the face. Although the exact cause of trigeminal neuralgia is not fully understood, a blood vessel is often found compressing the nerve. Several treatments can relieve the pain. Each treatment offers benefits, but each has limitations. You and your doctor should determine which treatment is best for you.

What is trigeminal neuralgia?

Neuralgia is severe pain caused by injury or damage to a nerve. The trigeminal nerve is the fifth (V) cranial nerve, which arises from the brainstem inside the skull. It divides into three branches and then exits the skull to supply feeling and movement to the face (Fig. 1):

  • Ophthalmic division (V1) provides sensation to the forehead and eye.
  • Maxillary division (V2) provides sensation to the cheek, upper lip, and roof of the mouth.
  • Mandibular division (V3) provides sensation to the jaw and lower lip; it also provides movement of the muscles involved in biting, chewing, and swallowing.


    trigeminal anatomy

    Figure 1. The trigeminal nerve supplies feeling and movement to the face. It has three divisions that branch from the trigeminal ganglion: ophthalmic division (V1) provides sensation to the forehead and eye, maxillary division (V2) provides sensation to the cheek, and mandibular division (V3) provides sensation to the jaw.

When the trigeminal nerve becomes irritated, an attack of intense pain results. Also called tic douloureux because of the uncontrollable facial twitching caused by the pain, trigeminal neuralgia is serious because it interferes with many aspects of a person's life. Typical trigeminal neuralgia involves brief instances of intense pain, like an electrical shock in one side of the face. This pain comes in repeated waves that last an hour or more. You may initially experience short, mild attacks, with periods of remission. But trigeminal neuralgia can progress, causing longer, frequent attacks of searing pain.

What are the symptoms?

Patients describe an attack as a "pins and needles" sensation that turns into a burning or jabbing pain, or as an electrical shock that may last a few seconds or minutes. In some cases of extreme pain, patients have even considered suicide. Everyday activities can trigger an episode. Some patients are sensitive in certain areas of the face, called trigger zones, which when touched cause an attack (Fig. 2). These zones are usually near the nose, lips, eyes, ear, or inside the mouth. Therefore, some patients avoid talking, eating, kissing, or drinking. Other activities, such as shaving or brushing teeth, can also trigger pain.

PSR2

Figure 2. Facial areas of trigger zones. Trigger points (circles) have the greatest sensitivity.

The pain of typical trigeminal neuralgia usually has the following features:

  1. Affects one side of the face
  2. Can last several days or weeks, followed by a remission for months or years
  3. Frequency of painful attacks increases over time and may become disabling

A less common form of the disorder, called atypical trigeminal neuralgia, causes a less intense, constant, dull burning or aching pain. This pain sometimes occurs with occasional electric shock-like stabs that may last a day or more. Atypical facial pain is more difficult to treat.

What are the causes?

Many believe that the protective sheath of the trigeminal nerve deteriorates, sending abnormal messages along the nerve. Like static in a telephone line, these abnormalities disrupt the normal signal of the nerve and cause pain. Several factors can cause the deterioration of this protective sheath: aging, multiple sclerosis, tumors, but most doctors agree that it is caused by an abnormal vein or artery that compresses the nerve.

Some types of facial pain can result from an infected tooth, sinus infections, shingles or postherpetic neuralgia, or previous nerve injury.

Who is affected?

Trigeminal neuralgia affects 1 in every 25,000 people, and occurs slightly more in women than men. Patients are usually middle age and older. Some people with multiple sclerosis also develop trigeminal neuralgia.

How is a diagnosis made?

When a person first experiences facial pain, a primary care doctor or dentist is often consulted. If the pain requires further evaluation, a consultation with a neurologist or a neurosurgeon may be recommended. The doctor examines and touches areas of your face to determine exactly where the pain is occurring and which branches of the trigeminal nerve may be affected.

Few causes of trigeminal neuralgia are serious. However, the possibility of a tumor or multiple sclerosis must be ruled out. Therefore, a magnetic resonance imaging (MRI) scan may be performed. An MRI FIESTA scan can detect any blood vessels compressing the nerve (Fig. 3). The diagnosis of trigeminal neuralgia is made after carefully assessing the patient's symptoms.

MRI

Figure 3. FIESTA MRI can detect blood vessels (arrow) that may be compressing the trigeminal nerve.

What treatments are available?

A variety of treatments are available, including medication, surgery, needle procedures, and radiation. First line treatment is medication. When medications fail to control pain or cause intolerable side effects, a neurosurgeon may be consulted to discuss other procedures.

Medication
Over-the-counter drugs such as aspirin and ibuprofen are not effective against trigeminal neuralgia. Anticonvulsants and muscle relaxants are prescribed to block the pain signals from the nerve. Medications are the initial treatment for trigeminal neuralgia and are used as long as the pain is controlled and the side effects do not interfere with a patient's activities. About 80% of patients experience at least short-term pain relief with medications. For effective pain control, medications must be taken on a regular schedule to maintain a constant level in the blood.

  • Anticonvulsants, such as carbamazepine (Tegretol), oxcarbazepine (Trileptal), phenytoin (Dilantin), gabapentin (Neurontin), lamotrigine  (Lamictal), and pregabalin (Lyrica) are used to control trigeminal neuralgia pain. If the medication begins to lose effectiveness, the doctor may increase the dose or switch to another type. Side effects may include drowsiness, unsteadiness, nausea, skin rash, and blood disorders. Therefore, patients are monitored routinely and undergo blood tests to ensure that the drug levels remain safe and that blood disorders do not develop. Multiple drug therapy may be necessary to control pain  (e.g., Tegretol and Neurontin).
  • Muscle relaxants, such as baclofen (Lioresal), are sometimes effective in treating trigeminal neuralgia. Side effects may include confusion, nausea, and drowsiness.

Surgery
The goal of surgery is to stop the blood vessel from compressing the trigeminal nerve, or to cut the nerve to keep it from sending pain signals to the brain. Surgical procedures are performed under general anesthesia, involve opening a hole in the skull (called a craniotomy), and require a 1 to 2 day hospital stay.

  • Microvascular decompression (MVD) is a surgery to gently reroute the blood vessel from compressing the trigeminal nerve by padding the vessel with a sponge. A 1-inch opening is made in the skull behind the ear, called a craniotomy. This opening exposes the trigeminal nerve at its connection with the brainstem. A blood vessel (occasionally a tumor) is often found compressing the nerve. After the nerve is freed from compression, it is protected with a small Teflon sponge (Fig. 4). The sponge remains in the brain permanently.

    MVD provides immediate pain relief in 95% of patients [1]. About 20% of patients have pain recurrence within 10 years. The major benefit of MVD is that it causes little or no facial numbness. The major disadvantages are the risks of anesthesia and of undergoing an operation near the brain.

mvd

Figure 4. During MVD, a sponge is inserted between the trigeminal nerve and the blood vessel to relieve the compression that causes the painful neuralgia attacks.

  • Sensory rhizotomy is the irreversible cutting of the trigeminal nerve root at its connection to the brainstem. A small opening is made in the back of the skull. A stimulation probe is used to identify the motor root of the nerve. The motor root, which controls the chewing muscles, must be preserved. The sensory root fibers, which transmit the pain signals to the brain, are severed (Fig. 5). Cutting the nerve causes permanent facial numbness and should only be considered for recurrent pain that has not responded to other treatments.
  • rhizotomy

    Figure 5. During sensory rhizotomy, the sensory root fibers are cut, but the motor root is preserved.

Outpatient needle procedures
Needle procedures are minimally invasive techniques of reaching the trigeminal nerve through the face without a skin incision or skull opening. They are performed with a hollow needle inserted through the skin (percutaneous) of the cheek into the trigeminal nerve at the base of the skull. The goal of rhizotomy or injection procedures is to damage an area of the trigeminal nerve to keep it from sending pain signals to the brain. Damaging the nerve causes mild to major facial numbness in that area. A degree of facial numbness is an expected outcome of the procedure and is necessary to achieve long-term pain relief. These outpatient procedures are typically performed under local anesthesia and light sedation. Patients go home the same day.

  • Radiofrequency rhizotomy, also called Percutaneous Stereotactic Radiofrequency Rhizotomy (PSR), uses a heating current to selectively destroy some of the trigeminal nerve fibers that produce pain. While asleep, a hollow needle and electrode are inserted through the cheek and into the nerve. The patient is awakened and a low current is passed through the electrode to stimulate the nerve. Based on your feedback, the surgeon positions the electrode so that tingling occurs where your painful attacks are located. Once the pain-causing area is located, the patient is put back to sleep and a heating current is passed through the electrode to damage only that portion of the nerve (Fig. 6).

    PSR provides immediate pain relief for 98% of patients [1]. About 20% of patients experience pain recurrence within 15 years. Medication, repeat PSR, or another surgical procedure can be considered. Complications may include double vision, jaw weakness, loss of corneal reflex, dysesthesia (troublesome numbness) and very rarely anesthesia dolorosa. Partial facial numbness in the area where the pain existed is expected. Other complications, such as blurred vision or chewing problems, are usually temporary.

psr

Figure 6. During PSR, a hollow needle is inserted through the cheek into the nerve. Once the electrode is correctly positioned, a heating current is used to destroy the pain-causing fibers.

  • Glycerol injection is similar to PSR in that a hollow needle is passed through the cheek to the nerve. The needle is positioned in the trigeminal cistern (a fluid-filled area in the ganglion). Glycerol is injected into the cistern to damage some of the trigeminal nerve fibers that produce pain. Because the location of the glycerol cannot be controlled precisely, the results are somewhat unpredictable.

    Glycerol injection provides immediate pain relief in 70% of patients [2]. About 50% of patients experience pain recurrence within 3 to 4 years. As with PSR, partial facial numbness is expected and complications are similar.
  • Balloon compression is similar to PSR in that a hollow needle is passed through the cheek to the nerve. However, it is performed under general anesthesia. The surgeon places a balloon in the trigeminal nerve through a catheter. The balloon is inflated where fibers produce pain. The balloon compresses the nerve, injuring the pain-causing fibers. After several minutes the balloon and catheter are removed.

    Balloon compression provides immediate pain relief for 80% of patients [2]. About 20% of patients experience pain recurrence within 3 years. Complications may include minor numbness, chewing problems, or double vision.

Peripheral neurectomy can be performed to the nerve branches by exposing them on the face through a small skin incision. Cutting the supraorbital nerve (branch of V1 division) may be advised if pain is isolated to the area above the forehead. Cutting the infraorbital nerve (branch of V2 division) may be performed if pain is limited to the area below the eye along the upper cheekbone. Cutting the nerve causes complete facial numbness in the region the nerve supplies.

Radiation
The goal of radiation treatment is to deaden the trigeminal nerve root to interrupt the pain signals from reaching the brain. Stereotactic radiosurgery is a noninvasive outpatient procedure that uses radiation beams to destroy some of the trigeminal nerve. A stereotactic mask or frame is attached to the patient’s head to precisely locate the nerve on an MRI scan and to hold the head perfectly still during treatment. Highly focused beams of radiation are delivered to the trigeminal nerve root (Fig. 7). In the weeks after treatment, a lesion (injury) gradually develops where the radiation occurred.

Pain relief may not occur immediately but rather gradually over time. About 50% of patients have pain relief in 4 weeks; 75% of patients have pain relief in 8 weeks. Patients remain on medication for a period of time following treatment to control the pain while the radiation takes effect. Seventy percent of patients are relieved of pain for 2 years. In about 50% of patients, pain recurs 3 to 5 years after treatment [3]. Complications include facial numbness and dry eye.

srs

Figure 7. During radiosurgery, a high dose of radiation is delivered to the trigeminal nerve. Over time the radiation will damage the nerve fibers and interrupt the pain signals.

Clinical trials

Clinical trials are research studies in which new treatments—drugs, diagnostics, procedures, and other therapies—are tested in people to see if they are safe and effective. Research is always being conducted to improve the standard of medical care. Information about current clinical trials, including eligibility, protocol, and locations, are found on the Web. Studies can be sponsored by the National Institutes of Health (see clinicaltrials.gov) as well as private industry and pharmaceutical companies (see www.centerwatch.com).

Recovery

No one procedure is best for everyone and each procedure varies in its effectiveness versus side effects (see Comparison of Treatment Results for Facial Pain). Microvascular decompression (MVD) and radiofrequency rhizotomy (PSR) have comparable rates of pain relief that are highest among the available options. In a study of approximately 100 patients or more published in the past 10 years, the rates of pain relief were 77% in 7 years for MVD and 75% in 6 years for PSR rhizotomy.

Trigeminal neuralgia can recur in divisions of the nerve previously free of pain. This can occur following all treatments and may represent progression of the underlying disorder rather than recurrence. 

Sources & links

If you have more questions, contact the Mayfield Clinic at 800-325-7787 or 513-221-1100.

Support
Support groups provide an opportunity for patients and their families to share experiences, receive support, and learn about advances in treatments, pain control, and medications. Please contact the TNA Facial Pain Association at 800-923-3608.

Sources

  1. Taha JM, Tew JM Jr: Comparison of surgical treatments for trigeminal neuralgia: Reevaluation of radiofrequency rhizotomy. Neurosurgery 38:865-871, 1996
  2. Tew JM: Therapeutic Decisions in Facial Pain. Clinical Neurosurgery 46:410-431, 2000
  3. Gronseth G, et al.: Practice Parameter: The diagnostic evaluation and treatment of trigeminal neuralgia (an evidence-based review). Neurology 71:1183-90, 2008

Links
TNA Facial Pain Association, www.fpa-support.org
American Pain Society, www.ampainsoc.org
Facial Neuralgia Resources, facial-neuralgia.org

Trigeminal Neuralgia Diagnostic Questionnaire

Glossary

anesthesia dolorosa: constant pain felt in an area of total numbness; similar to phantom limb pain.

anticonvulsant: a drug that stops or prevents convulsions or seizures.

dysesthesia: a numbness, crawling, or unpleasant sensation that a person considers disturbing.

glycerol: an oily fluid that can be injected into a nerve to destroy its pain-producing portion.

multiple sclerosis: a chronic degenerative disease of the central nervous system in which the myelin (sheath) surrounding the nerves is destroyed.

neuralgia: nerve pain.

neurectomy: cutting of a nerve to relieve pain.

percutaneous: through the skin.

postherpetic neuralgia: chronic pain that persists after shingles rash and blisters have healed.

radiofrequency: radiant energy of a certain frequency.

neurectomy: cutting of a nerve for the relief of pain.

rhizotomy: interruption or destruction of a group of nerve fibers by chemical or radiowaves.

percutaneous: by way of the skin (e.g, injection).

shingles (herpes zoster): a viral infection that causes a painful skin rash and blisters along the course of a nerve; a reactivation of chickenpox.

tic douloureux: French for trigeminal neuralgia.


updated > 2.2013
reviewed by > John Tew, MD and Nancy McMahon, RN, Mayfield Clinic / University of Cincinnati Department of Neurosurgery, Ohio

Mayfield Certified Health Info materials are written and developed by the Mayfield Clinic & Spine Institute. We comply with the HONcode standard for trustworthy health information. This information is not intended to replace the medical advice of your health care provider.


 

Mayfield services

At Mayfield, our approach to facial pain is grounded in compassion and personalized care. Our neurosurgeons are experts at diagnosing the various types of facial pain, including trigeminal neuralgia, hemifacial spasm, glossopharyngeal neuralgia, and cluster headache. We are one of the few centers to offer all available treatment options: microvascular decompression, percutaneous rhizotomy, radiosurgery and sensory rhizotomy.

Treating more than 150 people with trigeminal neuralgia each year makes us one of largest treatment centers in the world. Dr. John Tew, known worldwide as an expert in trigeminal neuralgia, has treated more than 4,000 patients during the past 40 years. He developed the curved-tip electrode for PSR, has published numerous articles about the condition, and serves on the TNA Medical Advisory Board.

To make an appointment, call 513-221-1100.

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ask the doctor

Q. Is trigeminal neuralgia pain tougher to treat the longer you wait to have surgery?

A. TN is a progressive disorder that is associated with a mix of painful periods and remissions. The condition commonly increases in severity and becomes resistant to medications. The results of surgical therapy are best in the early stages of the disease but even the most advanced patients usually respond favorably to the best medical and surgical approaches.

Q. Does the success rate of MVD surgery go down if I first have a percutaneous procedure, such as radiofrequency rhizotomy, glycerol injection or balloon compression?

A. There is considerable evidence that failure of any procedure is associated with less success when other procedures are attempted. The basic principle of the two surgical approaches are different but interrelated. Microvascular decompression seeks to repair the basic cause of the pain, while percutaneous rhizotomy and other procedures, which block the nerve, seek to separate the pain site from its recognition in the brain. Therefore failure of one procedure effectively performed is more likely to be associated with a less satisfactory outcome with another. However recurrence of pain after a successful treatment such as percutaneous rhizotomy usually responds to another source of treatment.


 clinical trials


Click here for information about clinical trials conducted by our doctors at local Cincinnati hospitals or call 1-800-325-7787.

 

 support groups


For support in the Greater Cincinnati area, please call the Mayfield Clinic at (513) 569-5273 or by email.

For national and online support groups, contact the TNA Facial Pain Association at 800-923-3608.