Emery-Dreifuss Muscular Dystrophy in Children
What is Emery-Dreifuss muscular dystrophy in children?
Emery-Dreifuss muscular dystrophy (EDMD) is one of the muscular dystrophies. These
are a group of rare, inherited muscle diseases (myopathies). EDMD causes weakness
in your child’s shoulders, upper arms, and calves. The disease also causes stiff joints
that can’t move well (contractures). Sometimes it affects the heart’s electrical system.
The name of the disease refers to the two doctors who first described it in the 1960s.
Symptoms usually appear at about 10 years of age and slowly get worse. EDMD usually
affects boys, but girls also can get some forms of the disease.
What causes Emery-Dreifuss muscular dystrophy in a child?
EDMD has several forms. All of them are caused by changes (mutations) in one of three
genes that each make a protein in muscle cells. These proteins are part of the envelope
(membrane) around the nucleus in muscle cells. The nucleus is the sac within cells
that contains the genes. A mutation in any one of these proteins can cause EDMD.
Parents can pass EDMD down to their children in different ways:
The most common form of EDMD is X-linked. This means that the changed gene is on the
X chromosome. Chromosomes contain genes and are in the nucleus of your cells. Only
boys get this form of EDMD. Girls have two X chromosomes, one from each parent. Boys
get one X chromosome from their mother and a Y chromosome from their father. Because
a boy has only one copy of the changed gene, a mutation means that he will not have
enough of the protein to keep his muscles working well. A girl with the gene defect
usually gets enough normal protein from her other X chromosome. But she will be a
carrier for the mutation and can pass it on to her children.
Another form of EDMD affects both boys and girls, and either parent can pass this
form down to their children. The term for this kind of inherited pattern is autosomal dominant. In this case, a parent with the disease has a 1 in 2 chance of passing it on to each
of their children.
A rare form of EDMD happens when a child inherits a mutated gene from both parents
( autosomal recessive). Both boys and girls may have this form.
All three forms of EDMD have similar symptoms. Researchers are still trying to understand
the connections between these defective proteins and the muscle weakness in EDMD.
What are the symptoms of Emery-Dreifuss muscular dystrophy in a child?
Children usually show signs of EDMD by 10 years of age. You may first notice “toe-walking”
or waddling. Common symptoms include:
Weakness and wasting (atrophy) of muscles in the shoulders, upper arms, and calves
Stiff joints that make it hard to move around. The joints are often in the elbow,
neck, heel, and spine.
Muscle weakness that slowly gets worse
Fainting or fluttering heartbeat (palpitations) because of heart problems. These are
usually seen by age 30.
The muscle weakness in EDMD gets worse very slowly, and many people are still able
to walk late in life. Some people may eventually need a wheelchair or other help getting
How is Emery-Dreifuss muscular dystrophy diagnosed in a child?
Your child’s healthcare provider will start by taking a health history, asking about
recent symptoms, past health conditions, and family health history. The healthcare
provider will do a physical exam. Your child may need tests, including:
Blood tests, for muscle enzymes such as creatine kinase
DNA blood tests, for EDMD changes
Electromyography, to measure the electrical activity of the muscles
MRI, to see the pattern of muscle damage
Muscle biopsy, to look at the muscle cells or confirm a diagnosis
Electrocardiogram, to look for possible effects on the heart
Heart monitoring, such as Holter monitoring or a loop recorder
Your child may first see their primary healthcare provider and later be referred to
a neurologist. Some neurologists have special training to treat neuromuscular diseases
such as EDMD. Your child may also need to see other providers such as cardiologists,
geneticists, and physical therapists. Your child’s healthcare provider may also refer
your child to a muscular dystrophy clinic. This place has a healthcare team trained
to help treat this disease.
How is Emery-Dreifuss muscular dystrophy treated in a child?
Treatment for EDMD focuses on supportive treatment. There is no cure. Physical therapy
is a key part of managing the condition. Many healthcare providers may be involved
to help your child and family. Your child may need certain treatments, such as:
Range-of-motion and stretching exercises. These help limit problems with stiff joints.
Surgery to release contractures. This may also help with mobility. Your child may
need several surgeries.
Heart medicine to treat cardiomyopathy
Pacemakers or other heart devices. These lower the risk for sudden cardiac arrest.
Breathing devices such as a ventilator machine. Your child may need these if their
breathing muscles are affected.
Ongoing monitoring of your child's emotional health for depression and anxiety. Ask
your provider for help explaining the condition to your child and finding support
Emotional support for your child and your family. A diagnosis of EDMD can have a great
impact emotionally and financially. Counseling and community resource support can
be critical to family stability.
Active involvement with the school community. The Americans with Disabilities Act
(ADA) provides special protections for children with disabilities. These laws apply
to children in the public school system and allow children with serious disabilities
equal access to educational opportunities. Contact your school for information.
What are possible complications of Emery-Dreifuss muscular dystrophy in a child?
Heart problems are the most common complication in EDMD. Most people with the condition
have some heart problems by age 30. People with EDMD need to be closely monitored.
Problems can include:
Irregular heartbeat. This is caused by problems sending electrical signals from one part of the heart to
another. It can cause slowed heartbeat or missed heartbeats. Your child will need
checkups at least once a year for irregular heartbeats or other heart problems. This
is true even if your child has no symptoms. Your child may need a pacemaker or an
implantable cardioverter-defibrillator (ICD) to reduce the risk for complete heart
block or sudden cardiac arrest.
Stretched and weakened heart muscle (dilated cardiomyopathy). This can make it hard for the heart to pump enough blood through the body. Your child
may need medicine such as beta-blockers or angiotensin-converting enzyme (ACE) inhibitors.
Muscle weakness. This usually gets worse over time. It may spread to involve the hips and other muscles
throughout the body.
Stiff joints that are difficult to move (contractures). Your child may need aids such as canes, braces, a walker, or a wheelchair.
Breathing problems. These are caused by weakened breathing muscles. A positive pressure respirator can
help give your child enough air flow.
Social and emotional challenges. Children may feel isolated from their peers. They may have difficulty dealing with
Key Points about Emery-Dreifuss muscular dystrophy in children
EDMD is a rare genetic muscle disease that slowly causes weakness in the shoulders,
upper arms, and calves. It also causes stiff joints.
EDMD usually shows up at about 10 years of age. The most common form of EDMD only
affects boys, but other forms affect both boys and girls.
Treatment is an ongoing process and is determined by the child's presenting symptoms
and disease progression.
Heart problems are common in EDMD. A child with EDMD needs to be tested at least every
year. You may need medicines or devices such as a pacemaker.
Physical therapy can help keep flexibility and range of motion.
A range of medical and community resources are needed to help the child and family
cope with the physical, emotional, and financial impacts of the disease.
Tips to help you get the most from a visit to your child’s healthcare provider:
Know the reason for the visit and what you want to happen.
Before your visit, write down questions you want answered.
At the visit, write down the name of a new diagnosis and any new medicines, treatments,
or tests. Also write down any new instructions your provider gives you for your child.
Know why a new medicine or treatment is prescribed and how it will help your child.
Also know what the side effects are.
Ask if your child’s condition can be treated in other ways.
Know why a test or procedure is recommended and what the results could mean.
Know what to expect if your child does not take the medicine or have the test or procedure.
If your child has a follow-up appointment, write down the date, time, and purpose
for that visit.
Know how you can contact your child’s provider after office hours. This is important
if your child becomes ill and you have questions or need advice.