Cervical dystonia is characterized by long-lasting (chronic sustained) involuntary contractions (spasms) or periodic, intermittent contractions of the neck muscles, causing the neck to turn in different ways.
Dystonia can also occur in muscles other than those in the neck.
The neck may move in one or more of the following ways:
One form (called adult-onset cervical dystonia) begins in adulthood. Because it causes the neck to rotate, it is sometimes called spasmodic torticollis. It is the most common dystonia that affects only one part of the body. Usually, the cause is unknown, but in some people, spasmodic torticollis is caused by a genetic mutation. Stress and emotional problems may make spasmodic torticollis worse.
Cervical dystonia can
Rarely, an emotional problem is thought to contribute.
Symptoms of cervical dystonia may begin at any age but usually begin between the ages of 20 and 60, most often between ages 30 and 50.
Symptoms usually begin gradually and rarely begin suddenly.
Sometimes symptoms begin with shaking the head from side to side, as if people are shaking their head to say no. Some neck muscles may contract and stay contracted, or they may contract intermittently, twisting the neck. The contractions may be painful. The head may be turned to one side or pulled forward or backward. Sometimes one of the shoulders is raised.
Symptoms range from mild to severe. Usually, the spasms worsen slowly for 1 to 5 years, then plateau. In about 10 to 20% of people, they disappear on their own, within 5 years from when symptoms begin. Spasms are more likely to disappear when they are mild and begin at a young age. However, they may persist for life, restricting movement and permanently twisting the head, neck, and shoulders in a distorted position.
The diagnosis of cervical dystonia is based on symptoms and a neurologic examination.
Some physical techniques can sometimes temporarily relieve spasms. Physical therapy may help by improving flexibility. Therapists may also help people identify which movements worsen spasms and which ones relieve them. Biofeedback (using relaxation techniques to control unconscious body processes, such as heart rate and muscle tension) or massage may help some people.
People may find certain tricks that may briefly relieve spasms. They include lightly touching the chin, cheek, upper face, or back of the head. These tricks are usually more effective if done on the same side as the spasm.
When an emotional problem contributes, treatment is best managed by a team of doctors, including a psychiatrist, a psychologist, and a neurologist.
Injections of botulinum toxin into the affected muscles can reduce painful spasms in about 70% of people and allow the head to return to a more normal position. However, for continuous relief, injections must be repeated every 3 to 4 months.
Pain relievers, given by mouth, can lessen the pain but do not control the spasms. Drugs with anticholinergic effects, such as trihexyphenidyl, may help relieve spasms, but troublesome side effects (such as confusion, drowsiness, and dry mouth) may limit their use. A benzodiazepine (a sedative), particularly clonazepam, baclofen (a muscle relaxant), and carbamazepine (an anticonvulsant) may help.
The role of surgery is controversial. Surgery involves cutting the nerves to the affected muscles, so that nerves can no longer stimulate the muscle to contract. When the procedure is done by skilled surgeons, benefits outweigh potential complications.
If symptoms are severe and all of the usual treatments have been ineffective, deep brain stimulation can be done. For this procedure, tiny electrodes are surgically implanted in part of the basal ganglia (collections of nerve cells that help smooth out muscle movements). The electrodes send small amounts of electricity to the specific area of the basal ganglia that causes cervical dystonia and thus help lessen symptoms.