You may have noticed that your little one is starting to have difficulty walking and climbing stairs since they were running and playing. Or do you feel like they are constantly falling and feeling very tired? These may seem like small things that we don't pay much attention to, but they can be early signs of serious conditions. That's exactly what we're going to talk about today, a disease that gradually weakens the muscles, especially in boys.
What is Duchenne Muscular Dystrophy (DMD)?
Simply put, Duchenne muscular dystrophy, or DMD for short, is a disease in which the skeletal muscles in our body, the muscles that help move our limbs, and the heart muscle, gradually weaken and become inactive over time. This is the most common and severe type of muscular dystrophy .
Think of it this way: our muscles are like elastic rubber bands. In this disease, the strength of those elastic muscles decreases and they no longer function properly. Over time, this condition only gets worse, not better.
DMD is often genetic, meaning it is passed down from generation to generation . Specifically, it is transmitted as an X-linked recessive trait . This means that if the mother is a carrier of the disease, her child can get it from her. However, in some cases, about 30% of cases, the condition can also occur due to a new genetic mutation , even if no one in the family has had the disease before. This means that sometimes it can also happen randomly.
Who is most affected by this DMD condition?
Duchenne muscular dystrophy mainly affects boys . However, girls who are carriers of the gene that causes the disease can sometimes show mild symptoms. However, this is not very common.
Symptoms of muscle weakness usually begin between the ages of 2 and 4. However, some children may not start showing these symptoms until they are about 6 years old. Therefore, if you have any doubts, it is best to seek medical advice.
How common is DMD?
Although this is a serious condition, it is not as rare as one might think. Statistics show that about one in 3,600 live births of male children worldwide suffers from DMD. DMD is one of the most common of the severe, inherited myopathies , or diseases of the skeletal muscles.
Is DMD a fatal disease?
Yes, sadly, DMD is a disease that is ultimately fatal . Many people with the condition die from complications that affect the lungs and heart. But don't worry, with current treatments, there are ways to extend your life and maintain a somewhat better quality of life.
What are the symptoms of DMD?
As we mentioned earlier, DMD symptoms usually begin between the ages of 2 and 4. However, sometimes they can start as early as infancy, or even appear later in childhood.
As DMD causes muscle weakness to decrease over time, the most common symptoms are:
- Muscle weakness and wasting (muscle atrophy) that gradually increases, starting in the legs and hips. This condition affects the arms, neck, and other parts of the body to a lesser extent.
- Calf muscle hypertrophy (which means the calf muscle becomes larger). This occurs when muscle fibers are replaced by fatty tissue and connective tissue.
- Difficulty climbing stairs.
- Difficulty walking over time.
- Frequent falls.
- A waddling gait.
- Toe walking.
- Feeling tired quickly (fatigue).
Imagine, if your son gets up from playing on the floor, presses his hands to the floor, then places his hands on his knees, and slowly lifts his body with great difficulty, that could also be a symptom of this disease (this is also called Gowers' sign).
In addition to this, DMD can cause other symptoms:
- Heart muscle disease (Cardiomyopathy).
- Difficulty breathing and shortness of breath.
- Cognitive impairment and learning differences.
- Delays in speech and language development.
- Developmental delays.
- Scoliosis.
- Short stature.
Between 2.5% and 20% of girls who carry the gene that causes DMD (carriers) may develop mild symptoms, but they are usually not severe.
Why does something like this DMD happen?
The main cause of DMD is a mutation in the gene that codes for the production of dystrophin, a protein that is essential for keeping our muscles healthy. This protein, dystrophin, is essential for the dystrophin-glycoprotein complex (DGC), which acts as a structural unit of muscles.
In DMD, both dystrophin and DGC proteins are lost, ultimately leading to muscle cell death (necrosis) . A person with DMD has less than 5% of the amount of dystrophin needed for healthy muscle.
As people with DMD age, their muscles are unable to replace these dead cells with new ones. Instead , connective tissue and adipose tissue replace muscle fibers.
As we mentioned earlier, DMD is an X-linked recessive condition. However, in about 30% of cases, it can also occur randomly, without any family history.
"X-linked" means that the gene responsible for DMD is located on the X chromosome . As you know, males have one X chromosome and one Y chromosome, and females have two X chromosomes.
"Recessive" means that a person will only get the disease if they have two copies of the gene that causes the disease. But males have one X chromosome. So if the gene mutation that causes DMD is on that X chromosome, they will get DMD. For a girl to get DMD, she must have this gene mutation on both of her X chromosomes. That's very rare. But if she has the mutation on only one X chromosome, she will be a carrier of the disease.
How is DMD diagnosed?
If your child shows signs of DMD, the doctor will first perform a physical exam , neurological exam, and muscle exam . They will also ask about your child's symptoms and medical history.
If the doctor suspects that the child has DMD, the following tests may be performed:
- Creatine Kinase (CK) blood test: When muscles are damaged, an enzyme called creatine kinase builds up in the blood. So, if the CK level is elevated, it can be a sign of DMD. This level usually peaks around the age of 2, and can be 10-20 times higher than normal.
- Genetic blood test: DMD can be confirmed by a genetic test that shows a complete or partial loss of the dystrophin gene.
- Muscle biopsy: The doctor may take a small sample of muscle from your child's thigh or calf. A specialist will look at the sample under a microscope to see if there are any signs of DMD.
- Electrocardiogram (EKG): Because DMD often affects the heart, the doctor will perform an EKG to check for any specific symptoms of DMD and to assess the health of the heart.
What are the treatments for this?
Unfortunately, there is currently no cure for DMD. Therefore, the main goal of treatment is to control symptoms and maintain the child's quality of life as best as possible.
The following are the supportive treatments for DMD:
- Corticosteroids: Steroid medications, such as prednisolone and deflazacort , help slow muscle loss, improve lung function, slow scoliosis, slow the rate of heart muscle weakness (cardiomyopathy), and extend life.
- Cardiomyopathy medications: Early initiation of medications such as ACE inhibitors and/or beta-blockers can control heart muscle weakness and prevent heart attacks.
- Physical therapy: The main goal of physical therapy is to prevent contractures , which are permanent tightening of muscles, tendons, and skin. This usually involves specific stretching exercises.
- Surgery for spinal stenosis and muscle tightness: In severe cases, surgery may be necessary to relieve muscle tightness. Surgery to correct spinal stenosis can improve lung function and breathing.
- Exercise: Your child's doctor will often recommend gentle exercise to prevent further muscle atrophy from disuse. This is usually done in conjunction with pool exercises and recreational activities.
Other supportive treatments include:
- Mobility aids: braces, canes, and wheelchairs.
- Tracheostomy and assisted ventilation for respiratory problems.
Over the past few decades, the life expectancy of people with DMD has increased significantly with advances in supportive care services.
Several new drugs are currently in clinical testing that may offer hope for treating DMD. Several new treatments, such as "exon skipping" (a method that "splices" a missing or mutated part of the dystrophin gene), have recently been approved by the FDA (Food and Drug Administration) . However, these treatments can only be used in a minority of people with very specific genetic mutations. Although these treatments increase the amount of the dystrophin protein in the muscles, they have not yet shown significant improvements in strength and physical function.
Can this DMD condition be prevented?
Because DMD is a hereditary condition, there is nothing you can do to prevent it . About a third of cases occur randomly, with no family history.
If you are concerned about the risk of passing DMD or other genetic conditions to your children before you try to have a baby, talk to your doctor about genetic counseling . In some cases, prenatal testing early in pregnancy may be able to detect DMD.
What kind of situation can be expected in the future (Prognosis)?
People with DMD often have a poor prognosis . This causes progressive disability, and many children with DMD are wheelchair-bound by the age of 12. DMD can also lead to early death.
What is the life expectancy of someone with DMD?
People with DMD often die from the condition by the age of 25. However, with advances in supportive care, many people are now living longer.
Death is often due to respiratory (breathing) or cardiac complications. Pneumonia, aspiration of a foreign object such as food, or airway obstruction can also cause death.
How do you care for someone with DMD?
If you are caring for someone with DMD, it is important to advocate for them, helping them get the best medical care and therapy possible , so they can have the best possible quality of life.
It may also be a good idea for you and your family to join a support group to meet other people who have had similar experiences. It can also be a great encouragement to know that you are not alone.
When should my child see a doctor about DMD?
If your child has been diagnosed with DMD, they will need to see their medical team regularly to receive treatment and monitor symptoms.
Understanding your child's DMD condition can be difficult for you. But your medical team will provide you with a structured management plan tailored to your child's symptoms. It is important to keep an eye on your child's health and make sure they are getting the support they need. Remember, your medical team is always there to help you, your family, and your child.
Finally, remember this (Take-Home Message)
Duchenne muscular dystrophy (DMD) is a serious, lifelong condition. However, awareness, early detection, and proper medical advice and supportive care can help keep a child's quality of life as high as possible.
Remember: You are not alone. Doctors, physical therapists, counselors, and other support groups are there to help you and your child. Research into new treatments is always happening. So don't give up hope. The most important thing is to give your child love, care, and encouragement.
If you have any concerns about your child's muscles or walking difficulties, don't dismiss them as minor. Seek advice from a qualified doctor immediately. The sooner the condition is diagnosed, the easier it will be to manage.
` Duchenne muscular dystrophy, DMD, muscular weakness, genetic diseases, diseases of boys, dystrophin, children's health
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