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Wilson's disease
Definition
Wilson's disease is an inherited disorder in which there is too much copper in the body's tissues. The excess copper damages the liver and nervous system.
Alternative Names
Hepatolenticular degeneration
Causes
Wilson's disease is a rare inherited disorder. If both parents carry an abnormal gene for Wilson's disease, there is a 25% chance in each pregnancy that the child will have the disorder.
Wilson's disease causes the body to take in and keep too much copper. The copper deposits in the liver, brain, kidneys, and the eyes. The deposits of copper cause tissue damage, death of the tissues, and scarring, which causes the affected organs to stop working correctly.
This condition is most common in eastern Europeans, Sicilians, and southern Italians, but may occur in any group. Wilson's disease typically appears in people under 40 years old. In children, the symptoms begin to show by age 4.
Symptoms
- Abnormal posture of arms and legs
- Confusion or delirium
- Dementia
- Difficulty moving arms and legs, stiffness
- Difficulty walking (ataxia)
- Emotional or behavioral changes
- Enlargement of the abdomen (abdominal distention)
- Personality changes
- Phobias, distress (neuroses)
- Slow movements
- Slow or decreased movement and expressions of the face
- Speech impairment
- Tremors of the arms or hands
- Uncontrollable movement
- Unpredictable and jerky movement
- Vomiting blood
- Weakness
- Yellow skin (jaundice) or yellow color of the white of the eye (icterus)
Exams and Tests
A slit-lamp eye examination may show:
- Limited eye movement
- Rusty or brown-colored ring around the iris (Kayser-Fleischer rings)
A physical examination may show signs of:
- Damage to the central nervous system, including loss of coordination, loss of muscle control, muscle tremors, loss of thinking and IQ, loss of memory, and confusion (delirium or dementia)
- Liver or spleen disorders (including cirrhosis, splenomegaly, and liver necrosis)
Lab tests may include:
- Complete blood count (CBC)
- Serum ceruloplasmin
- Serum copper
- Serum uric acid
- Urine copper
If there are liver problems, lab tests may find:
Other tests may include:
- 24-hour urine copper test
- Abdominal x-ray
- Abdominal MRI
- CT scan of the abdomen
- Head CT scan
- Head MRI
- Liver biopsy
The gene that causes Wilson's disease has been found. It is called ATP7B. DNA testing is available for this gene. Talk to your health care provider or a genetic counselor if you would like to have gene testing performed.
Treatment
The goal of treatment is to reduce the amount of copper in the tissues. This is done by a procedure called chelation -- certain medications can bind to copper and help remove it through the kidneys or gut. Treatment must be lifelong.
The following medications may be used:
- Penicillamine (Cuprimine, Depen) binds to copper and leads to increased release of copper in the urine.
- Trientine (Syprine) binds (chelates) the copper and increases its release through the urine.
- Zinc acetate (Galzin) blocks copper from being absorbed in the intestinal tract.
Vitamin E supplements may also be used.
Sometimes, medications that chelate copper (especially penicillamine) can affect the function of the brain and nervous system (neurological function). Other medications under investigation may bind copper without affecting neurological function.
A low-copper diet may also be recommended. Foods to avoid include:
- Chocolate
- Dried fruit
- Liver
- Mushrooms
- Nuts
- Shellfish
You may want to drink distilled water because most tap water flows through copper pipes. Avoid using copper cooking utensils.
Symptoms may be treated with exercise or physical therapy. People who are confused or unable to care for themselves may need special protective measures.
A liver transplant may be considered in cases where the liver is severely damaged by the disease.
Support Groups
Wilson's disease support groups can be found at www.wilsonsdisease.org and www.geneticalliance.org.
Outlook (Prognosis)
Lifelong treatment is needed to control Wilson's disease. The disorder may cause fatal effects, especially loss of liver function and toxic effects of copper on the nervous system. In cases where the disorder is not fatal, symptoms may be disabling.
Possible Complications
- Anemia (hemolytic anemia is rare)
- Central nervous system complications
- Cirrhosis
- Death of liver tissues
- Fatty liver
- Hepatitis
- Increased number of bone fractures
- Increased number of infections
- Injury caused by falls
- Jaundice
- Joint contractures or other deformity
- Loss of ability to care for self
- Loss of ability to function at work and home
- Loss of ability to interact with other people
- Loss of muscle mass (muscle atrophy)
- Psychological complications
- Side effects of penicillamine and other medications used to treat the disorder
- Spleen problems
Liver failure and damage to the central nervous system (brain, spinal cord) are the most common and dangerous effects of the disorder. If not caught and treated early, Wilson's disease is fatal.
When to Contact a Medical Professional
Call your health care provider if you have symptoms of Wilson's disease. Call a genetic counselor if you have a history of Wilson's disease in your family and you are planning to have children.
Prevention
Genetic counseling is recommended for people with a family history of Wilson's disease.
References
Kaler SG. Wilson's disease. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 230.
Reviewed By: Chad Haldeman-Englert, MD, FACMG, Wake Forest School of Medicine, Department of Pediatrics, Section on Medical Genetics, Winston-Salem, NC. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.
