|Tremor: The Basic Facts
by Lorna Smedman
Some people with MS experience tremor, an involuntary rhythmic shaking movement of the muscles. The most common type of tremor seen in people with MS is caused by loss of myelin on nerve fibers in the pathways that coordinate voluntary muscle movement and balance.
Tremor can affect the limbs, head, body, or the muscles needed for speech or sexual functioning. Some tremors are slight and don’t interfere with daily living while other tremors can significantly affect important basic activities. Gross tremor is characterized by wide back and forth motions, usually of the arms or legs. Intention or action tremors are activated when a person reaches for something. When tremor is severe, it can prevent a person from eating, writing, speaking clearly, or walking.
There is no cure for tremor, and it remains one of the most frustrating MS symptoms. Options for management include physical and occupational therapy techniques, drug therapy, stress management, neurosurgery, and electrode implants. Some of these options will work for one individual; others will not. Coping with tremor requires patience, good communication with health-care professionals, and some creative problem-solving.
Don Denton, of Lubbock, Texas, has been dealing with intention tremors due to his MS for over 20 years. He’s worked as a peer counselor with his chapter of the Society. When he talks to people who have problems with MS tremor, he tells them frankly that there is no easy answer. However, he also reassures them that they may be able to reduce their problems. Don has found some relief with drug therapy. He has also learned strategies that allow him to perform daily tasks better, and he plans ahead so that tremor-related problems don’t take him by surprise. For Don, tremor has become just one more piece of this challenging chronic disease.
Occupational and physical therapy techniques
Some tremor can be controlled through the use of braces. A rigid brace can support an affected limb while a person performs a specific activity. Afterwards, the brace can be removed. In some cases, however, bracing may actually increase other problems such as spasticity. Consult a rehabilitation specialist to explore this option.
Some people find it helpful to hold their arms close to the body or to prop an elbow against the chest in order to gain more control over forearm movements. Weights fastened to the wrists or ankles with Velcro strips can stabilize an affected limb. Weighted boots are also used. Putting weights on canes or walkers, or using weighted spoons or forks can make these tools easier to use when tremor is active. The use of weighted devices has to be balanced against the added fatigue they might cause. Therapists commonly offer samples for a try-out.
Adaptive equipment, such as wrist rests that facilitate writing or typing, and plates and cups with lips to minimize food spills, are also helpful to some people.
Physical or occupational therapists may be able to reduce the effects of tremor by teaching specific positions for some activities or by balance and coordination exercises. These might include repeating a series of movements related to an activity like eating, for example, until those muscles “learn” a pattern sufficiently well to override disruptions of the nervous system. Rehab therapists may also teach exercises that focus on stimulating the balance centers of the brain. Computers can provide biofeedback that teaches people to recognize balance problems in time to compensate for them.
Tremor and speech problems
Electronic aids, communication charts, or computer-assisted alternative communication systems are available. However, tremor this severe is not common for people with MS.
Stress management and tremor
Stress management techniques can be an essential tool for such situations. Dr. Young would also prescribe a beta-adrenergic blocking agent such as propranolol (Inderal) in pill form for someone who is facing a particularly stressful event such as giving a speech or appearing in public.
Drugs used to treat tremor
Other drugs that may be tried include gabapentin (Neurontin), isoniazid (Laniazid, in the US; Isotamine in Canada); and trihexyphenidyl (Artane). Some gross tremor can also be treated with baclofen, which is primarily an agent for treating spasticity.
Researchers are studying the effect of marijuana on tremor. However, until an alternative delivery system can be developed to protect lungs from smoke damage, it remains a dangerous as well as an unproven and illegal therapy.
The National MS Society recommends that people diagnosed with a relapsing form of MS begin treatment with one of the disease modifying drugs. These drugs may not have any direct effect on existing symptoms, including tremor, but they may slow down the progress of the disease and help avoid additional damage to central nervous system tissues.
Thalamotomy and deep brain stimulation
There has been some success reported in the treatment of MS tremor from using electrode stimulation of areas in the thalamus. This is called deep brain stimulation or DBS. A tiny electrode is implanted in a targeted area of the thalamus during open-skull surgery. The electrode is connected to a wire lead that is inserted under the skin of the neck. It connects to a control device inserted under the skin in the chest area. This device is programmed to send impulses to the electrode in the brain. These impulses interfere with the nerve signals that are causing muscles to make involuntary tremor movements.
DBS was originally developed for the treatment of tremor due to Parkinson’s disease. It is still a new therapy and is not yet FDA-approved for MS tremor.
The Center for Neurological Restoration at The Cleveland Clinic Foundation has performed approximately 40 DBS operations for people with MS. The Center is enthusiastic about this new neurosurgical technology but cautions people to have reasonable expectations. Tremor in MS is often associated with poor coordination (also called ataxia) and loss of the ability to judge distances (dysmetria). DBS may reduce tremor, but it doesn’t abolish these disabling symptoms.
Like any surgery, the DBS procedure has risks—a 2-3% risk of serious complications due to the surgery itself. Then, over time, DBS recipients tend to build up tolerance to a particular electronic signal. This means that they must frequently return to their doctor’s office to have the impulse generator reset, either to a higher or lower level. This is done using non-invasive radio signals.
Andrea Tucker, of Columbus, Ohio, made the assessment and decided that the benefits would outweigh the risk of complications or the bother of frequent office visits. She was often unable to feed herself or to write due to intention tremor in her arms. She had tried drug therapies, but found no relief. The fact that the DBS procedure is reversible helped her decide to try it. In 2000, she had the operation. Since then, Tucker is eating and writing again. At first, it was necessary to get her impulse generator reset every few months, but now this occurs less frequently. She does not find her implanted device noticeable or intrusive, but she has noticed that her problems with gait seem to increase when the device is turned on. Tucker simply turns it off when she needs to walk.
Coping over the long term
If tremor is having an impact on your social life or making you wary about going out in public, a professional therapist or counselor may help you arrive at solutions more acceptable than simply staying at home.
In dealing with this frustrating symptom, make use of all the available resources. These include a responsive health-care team—therapists, nurses, and counselors as well as your physician, your family and friends, and the National MS Society chapter nearest you. Educate yourself and those closest to you about tremor and all the possible therapies for it, including creative coping. And try to keep tremor in perspective.
Drug therapies and neurosurgical technologies now offer somewhat better outcomes for long-term management of tremor in MS. New developments are expected from research. There is hope for the future. But until improvements come to fruition, people who live with tremor will continue to piece together the strategies that best address their own individual situations.
For additional informationWritten by Lorna Smedman, PhD. Reviewed by the Client Education Committee of the National MS Society’s Medical Advisory Board.
|Copyright © National Multiple Sclerosis Society, 2004|