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Muscular dystrophy (MD) is a genetic condition caused by an altered gene, resulting in progressive weakness and degeneration of skeletal muscles. It affects people of all ages, genders, races, and ethnic groups, with certain types, such as Duchenne muscular dystrophy, being more prevalent in boys. MD can impact various muscle groups, including the heart and lungs, and lead to complications such as scoliosis, breathing issues, and intellectual disabilities. While there is currently no cure, treatments like physical therapy, occupational therapy, respiratory care, and assistive devices can help manage symptoms and improve quality of life.
| Characteristics | Values |
|---|---|
| Definition | A group of more than 30 genetic conditions that cause muscle weakness and other muscle-related symptoms |
| Cause | Changes in the genes that make proteins needed to form healthy muscles; defective or absent glycoproteins in the muscle membrane |
| Symptoms | Muscle weakness that gets worse over time, affecting movement and the ability to walk and perform daily activities; some types of MD can also affect other organs, such as the heart, lungs, spine, eyes, brain, or gastrointestinal system |
| Diagnosis | Genetic testing, blood and urine tests, imaging tests (MRI), electromyography, nerve conduction studies, heart testing (EKG) |
| Treatment | Physical therapy, occupational therapy, respiratory care, speech therapy, assistive devices, medicines, surgery |
| Incidence | Approximately 1 in 5,000 individuals worldwide; occurs in people of all races and ages |
| Prognosis | Progressive muscle degeneration and weakness, leading to potential respiratory and cardiac complications; can affect lifespan |
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What You'll Learn
Types of muscular dystrophy
There are more than 30 types of muscular dystrophy, a group of inherited muscle diseases that cause progressive weakness in the muscles that control movement. The symptoms of some types of muscular dystrophy are mild and progress slowly as you age, while other types cause more rapid muscle weakness and physical disability. The most common types of muscular dystrophy are outlined below.
Duchenne Muscular Dystrophy (DMD)
The most common type of muscular dystrophy, DMD mainly affects boys, but girls can also have a milder version of it. It first appears in very early childhood, and progresses rapidly. Most children are unable to walk by age 12 and later need a respirator to breathe. As DMD progresses, it affects the heart and lungs.
Becker Muscular Dystrophy (BMD)
BMD is the second most common type of muscular dystrophy. It mainly affects boys, but girls can have milder symptoms. Symptoms of BMD can appear any time between the ages of 5 and 60, but they typically start by the teenage years. BMD is caused by changes in the same gene as DMD, but it is less severe and progresses more slowly.
Myotonic Muscular Dystrophy (DM)
The most common form of muscular dystrophy diagnosed in adults, myotonic dystrophy affects men and women equally. People with myotonic dystrophy have difficulty relaxing their muscles after using them, and often experience weakness in the distal extremities, such as the hands and wrists. This type of muscular dystrophy can also affect the heart, lungs, intestines, brain, eyes, and hormone-producing organs.
Limb-Girdle Muscular Dystrophy (LGMD)
Limb-girdle muscular dystrophy affects the muscles of the upper arms, upper legs, shoulders, and hips. There are more than 20 forms of this type of muscular dystrophy, which can begin in people as young as age 2 and as old as age 40. It affects men and women equally. Weakness in the upper leg muscles may cause problems with climbing stairs, rising from a seated position, walking, or running.
Facioscapulohumeral Muscular Dystrophy (FSHD)
Facioscapulohumeral muscular dystrophy affects the muscles of the face, shoulder blades, and upper arms. This condition usually appears before age 20 in men and women but may develop as late as age 40. People with FSHD first have weakness of the muscles around the eyes and mouth, shoulders, upper arms, and lower legs.
Congenital Muscular Dystrophy (CMD)
Congenital muscular dystrophies refer to a group of muscular dystrophies that become apparent at or near birth. CMD causes overall muscle weakness with possible joint stiffness or looseness. Depending on the type, CMD may also involve spinal curvature (scoliosis), breathing issues, intellectual disabilities, learning disabilities, eye issues, or seizures.
Distal Muscular Dystrophy (DD)
Distal muscular dystrophy affects the muscles of the hands, feet, lower arms, and lower legs. Symptoms of distal muscular dystrophy begin in adulthood.
Oculopharyngeal Muscular Dystrophy (OPMD)
OPMD weakens muscles in the eyelids and throat. Symptoms, such as droopy eyelids (ptosis) and difficulty swallowing (dysphagia), often appear in your 40s or 50s.
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Symptoms
Muscular dystrophy is a genetic condition caused by gene mutations that affect proteins in muscles. It refers to a group of more than 30 genetic conditions that cause muscle weakness and other muscle-related symptoms. The symptoms of muscular dystrophy vary depending on the type but generally get worse over time. Some types of muscular dystrophy are present at birth or develop during childhood, while others develop during adulthood.
The symptoms of muscular dystrophy can vary significantly depending on the type. However, the main symptom is muscle weakness and other muscle-related issues. Each type can affect different muscles and parts of the body. Some common symptoms of muscular dystrophy include:
- Muscle atrophy
- Difficulty walking, climbing stairs, or running
- Irregular walking gait (like waddling or toe walking)
- Stiff or loose joints
- Permanent tightening of muscles, tendons, and skin (contractures)
- Spasticity
- Muscle pain
- Trouble swallowing (dysphagia)
- Heart problems, such as arrhythmia and heart failure (cardiomyopathy)
- Curved spine (scoliosis)
- Breathing issues
- Intellectual disabilities
- Learning disorders
Duchenne Muscular Dystrophy (DMD)
The most common type of muscular dystrophy, DMD, usually affects boys and begins in early childhood. Some symptoms of DMD include:
- Late walking
- Frequent falls
- Trouble rising from the floor or a lying or seated position
- Trouble running, jumping, or climbing stairs
- Waddling gait
- Walking on the toes or the balls of the feet
- Large calf muscles
- Muscle pain and stiffness
- Learning or behavior-related challenges
- Delayed growth
Becker Muscular Dystrophy (BMD)
BMD is the second most common type of muscular dystrophy and is less severe than DMD. It usually affects boys, but girls can have milder symptoms. Symptoms of BMD can appear anytime between the ages of 5 and 60 but typically start in the teenage years. Early symptoms of BMD include muscle weakness in the upper arms and shoulders, upper legs, and pelvis.
Myotonic Muscular Dystrophy
With this type of muscular dystrophy, the muscles cannot relax at will. Facial and neck muscles are often the first to be affected. Symptoms often start between the ages of 20 and 30, but some people may experience symptoms shortly after birth or during childhood. As the disease progresses, the heart might beat out of rhythm, and the heart muscle can weaken.
Facioscapulohumeral Muscular Dystrophy (FSHD)
FSHD commonly affects muscles in the face, shoulders, and upper arms. Symptoms tend to appear before the age of 20, but they can also start in the teenage years. When the muscles around the eyes are affected, it can cause trouble fully closing the eyelids, leading to dryness of the eyes. When the shoulders are affected, the shoulder blades may stick out like wings when the arms are raised.
Limb-Girdle Muscular Dystrophy (LGMD)
LGMD affects the muscles in the upper arms, upper legs, shoulders, and hips. It can affect people of all ages, and some people with this type of muscular dystrophy develop minor disabilities over time. Others may develop serious trouble using their arms or legs to perform everyday activities, such as walking or carrying things.
Oculopharyngeal Muscular Dystrophy (OPMD)
OPMD weakens the muscles in the eyelids and throat and can cause droopy eyelids (ptosis) and difficulty swallowing (dysphagia). It is also linked to muscle weakness in the limbs and near the center of the body. Symptoms often start in the 40s and 50s and progress slowly.
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Causes
Muscular dystrophy (MD) is a genetic condition caused by an altered gene, resulting in progressive weakness and degeneration of skeletal muscles. It is not contagious and cannot be caused by injury or activity. The altered gene can be inherited from one's parents or occur spontaneously due to gene mutations. These mutations affect the proteins in muscles, which are essential for maintaining muscle health and function.
MD is characterised by progressive muscle weakness, which can lead to physical disability. Different genes are involved in the development of various types of MD, each causing a specific form of the disease. For example, Duchenne muscular dystrophy, the most common type, usually affects young boys and is inherited through an X-linked recessive pattern. Girls can carry the gene and exhibit symptoms, but this type predominantly affects boys. Becker muscular dystrophy is similar but tends to be milder and progress more slowly.
Myotonic dystrophy is the most common type diagnosed in adults and affects both men and women equally. It causes difficulty in relaxing muscles after use and can impact the heart, lungs, and endocrine system. Facioscapulohumeral muscular dystrophy (FSHD) commonly affects the face, shoulders, and upper arms, with symptoms typically appearing before age 20. Limb-girdle muscular dystrophy (LGMD) affects the upper arms, upper legs, shoulders, and hips and can occur at any age.
Emery-Dreifuss muscular dystrophy (EDMD) primarily impacts male children and young adults, causing muscle weakness in the shoulders, upper arms, and shins. It also affects the heart and progresses slowly. Oculopharyngeal muscular dystrophy (OPMD) weakens the eyelid and throat muscles, leading to droopy eyelids and swallowing difficulties. Congenital muscular dystrophies (CMD) refer to a group of muscular dystrophies present at or near birth, causing overall muscle weakness and possible joint stiffness or spinal curvature.
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Diagnosis
Muscular dystrophy is a rare genetic condition that causes progressive skeletal muscle degeneration and weakness that gets worse over time. It refers to a group of more than 30 types of genetic conditions that affect muscle function. While some types of muscular dystrophy start in early childhood, others do not manifest until adulthood. The most common type, Duchenne muscular dystrophy, usually affects young boys, but girls can also have milder versions of the disease.
If you or your child exhibit symptoms of muscular dystrophy, a healthcare provider will likely perform a physical exam, neurological exam, and muscle exam. They will also ask detailed questions about your symptoms and medical history. If muscular dystrophy is suspected, the following diagnostic tests may be recommended:
Creatine Kinase Blood Test
Muscles release creatine kinase when they are damaged. Therefore, elevated levels of creatine kinase in the blood may indicate muscular dystrophy.
Genetic Tests
Certain genetic tests can identify gene mutations linked to muscular dystrophy. These tests are usually performed on blood samples and can identify which faulty gene is causing the condition.
Muscle Biopsy
A small sample of muscle tissue is removed and examined under a microscope to look for signs of muscular dystrophy.
Electromyography (EMG)
This test measures the electrical activity of muscles and nerves. A special needle is inserted into the muscle being tested, and the electrical activity is measured as the muscle is relaxed and gently tightened. Changes in the pattern of electrical activity can confirm a muscle disease.
Additional Tests
Other tests may be recommended based on the specific type of muscular dystrophy suspected, such as tests to monitor heart and lung function, including electrocardiography, echocardiogram, and pulmonary function tests.
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Treatment
While there is currently no cure for muscular dystrophy, treatments can help manage symptoms and improve quality of life. Treatment plans are unique to each patient and depend on the type of muscular dystrophy and the symptoms they experience.
Physical and Occupational Therapy
The main goal of physical and occupational therapy is to strengthen and stretch muscles, helping patients maintain movement function.
Corticosteroids
Corticosteroids such as prednisolone and deflazacort may be used to delay muscle weakness, improve lung function, delay scoliosis, slow the progression of cardiomyopathy, and prolong survival.
Mobility Aids
Devices such as canes, braces, walkers, and wheelchairs can improve mobility and prevent falls as muscle weakness gets worse.
Surgery
In some cases, surgery may be necessary to relieve tension in contracted muscles or to correct spine curvature (scoliosis).
Heart Care
Early treatment with ACE inhibitors and/or beta-blockers may slow the progression of cardiomyopathy and prevent heart failure. Pacemakers can also help treat heart rhythm problems.
Speech Therapy
Speech therapy can aid those who have difficulty swallowing, a symptom of some types of muscular dystrophy.
Respiratory Care
Cough-assist devices and respirators can help with breathing. In cases of respiratory failure, tracheostomy and assisted ventilation may be necessary.
Medications
Medications such as eteplirsen and golodirsen have been developed to alter the course of certain forms of muscular dystrophy, specifically Duchenne muscular dystrophy (DMD).
Gene Therapy
Clinical trials of gene therapy for DMD have been conducted, with the first such therapy being approved by the FDA in 2023. Antisense oligonucleotides allow for muscle cells to produce shortened but functional forms of dystrophin, a protein that helps strengthen muscle fibres and protect them from injury.
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