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Muscle disorders, or myopathies, are conditions that directly affect skeletal muscles, causing weakness, pain, or paralysis. There are several types of myopathies, including those that are genetic or inherited, and those that develop later in life. Myopathies do not include direct muscle injuries such as tears or strains. Neuromuscular disorders, on the other hand, involve dysfunction of the peripheral nerves, muscles, or the communication between them. These disorders can lead to muscle weakness and atrophy, and in some cases, cardiac failure. While there is currently no cure for neuromuscular disorders, treatments such as medications, physical therapy, and surgery can help manage symptoms and enhance patients' quality of life.
| Characteristics | Values |
|---|---|
| Definition | Neuromuscular disorders involve dysfunction of peripheral nerves, muscles, or the communication between them. |
| Cause | The cause of muscle disorders is sometimes unknown. They can be caused by genetic defects, toxic gene products, or defects in connective tissue or the muscle fiber membrane. |
| Types | Myopathies, muscular dystrophy, Lambert-Eaton myasthenic syndrome (LEMS), myasthenia gravis, Charcot-Marie-Tooth disease, chronic inflammatory demyelinating polyneuropathy (CIDP), Guillain-Barré syndrome, Duchenne muscular dystrophy (DMD), Becker muscular dystrophy (BMD), myotonic dystrophy, oculopharyngeal muscular dystrophy (OPMD), congenital muscular dystrophy (CMD), distal muscular dystrophy, inflammatory myopathy, progressive muscle weakness, cardiomyopathy, congenital myopathy, spinal muscular atrophy, congenital myasthenic syndromes. |
| Symptoms | Muscle weakness, pain, paralysis, atrophy, fatigue, difficulty walking, climbing stairs, or running, difficulty swallowing, droopy eyelids, breathing issues, intellectual disabilities, learning disabilities, seizures, endocrine issues (e.g., thyroid disease, diabetes), cardiac failure. |
| Diagnosis | A physician will examine the patient's medical and family history, reflexes, and muscle strength. Other diagnostic tests may include electromyography (EMG), nerve conduction studies, musculoskeletal MRI, needle biopsy, and genetic testing. |
| Treatment | There is currently no cure for neuromuscular disorders. Treatment aims to manage symptoms, delay disease progression, and improve quality of life through medications, physical therapy, occupational therapy, and surgery. Research is being done on genetic therapies and new medications to find a cure. |
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What You'll Learn
- Neuromuscular disorders: dysfunction of peripheral nerves, muscles, or their communication
- Muscular dystrophy: genetic conditions causing progressive skeletal muscle weakness
- Lambert-Eaton myasthenic syndrome: a neuromuscular junction disorder
- Myopathies: conditions directly affecting skeletal muscles, excluding injuries
- Myotonic dystrophy: difficulty relaxing muscles after use, affecting heart and lungs
Neuromuscular disorders: dysfunction of peripheral nerves, muscles, or their communication
Neuromuscular disorders are a broad category of neurological disorders that affect the nerves that control voluntary muscles and the nerves that communicate sensory information to and from the brain. They can be inherited or caused by spontaneous gene mutations, or even immune system disorders.
The nervous system and muscles work together to permit movement, and this is known as the neuromuscular system. When neurons become unhealthy or die, communication between the nervous system and muscles breaks down, resulting in muscle weakness and atrophy. The most common symptom of neuromuscular disorders is muscle weakness, but they can also cause muscle atrophy and a disturbance of sensation, such as numbness and tingling. Other symptoms include weakness, pain, and even paralysis.
There are hundreds of types of neuromuscular disorders, and they can be divided into several subgroups based on the area of dysfunction. These include nerve roots, plexuses, peripheral nerves, the neuromuscular junction, and muscle fibres. Peripheral neuropathies, for example, may affect only parts of the body or most of it. The most common form impacts the hands and feet.
There is currently no cure for neuromuscular disorders, but treatments can help manage symptoms and delay disease progression. These include medication, physical therapy, occupational therapy, and surgery.
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Muscular dystrophy: genetic conditions causing progressive skeletal muscle weakness
Muscle syndromes can refer to a wide range of neuromuscular disorders that involve dysfunction of peripheral nerves, muscles, or the communication between them. One such syndrome is muscular dystrophy, which refers to a group of more than 30 genetic conditions that cause progressive skeletal muscle weakness and other muscle-related symptoms.
Muscular dystrophy is characterised by progressive muscle weakness and wasting, with a global incidence of approximately 1 in 5,000 individuals. It can manifest at any age, but it is most commonly diagnosed in childhood. The root cause of muscular dystrophy lies in mutations affecting genes responsible for muscle structure and function, leading to the gradual degeneration and loss of muscle fibres. This results in progressive muscle weakness, with some individuals experiencing rapid muscle weakness and physical disability.
There are several types of muscular dystrophy, each characterised by a unique genetic mutation and pathophysiology. However, all forms share the common feature of progressive loss of muscle mass and strength. For example, Duchenne muscular dystrophy (DMD), the most common type, results from an absence of the muscle protein dystrophin. Other types include Emery-Dreifuss muscular dystrophy (EDMD), which mainly affects male children and young adults, causing muscle weakness in the shoulders, upper arms, and shins, and also impacting heart function. Facioscapulohumeral muscular dystrophy (FSHD) commonly affects muscles in the face, shoulders, and upper arms, with symptoms tending to appear before age 20. Limb-girdle muscular dystrophy (LGMD) affects the muscles in the upper arms, upper legs, shoulders, and hips and can affect people of all ages. Oculopharyngeal muscular dystrophy (OPMD) weakens the muscles in the eyelids and throat, with symptoms such as droopy eyelids and difficulty swallowing often appearing in middle age.
The symptoms of muscular dystrophy can vary depending on the type, but they generally worsen over time. Muscle- and movement-related symptoms include muscle atrophy, difficulty walking or running, irregular walking gait, stiff or loose joints, permanent tightening of muscles, tendons, and skin, muscle pain, and trouble swallowing. Some types of muscular dystrophy also affect organs such as the heart, lungs, gastrointestinal system, endocrine glands, spine, eyes, and brain. While there is currently no cure for muscular dystrophy, treatments aim to manage symptoms, delay disease progression, and enhance patients' quality of life through medications, physical therapy, occupational therapy, and, when necessary, surgery.
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Lambert-Eaton myasthenic syndrome: a neuromuscular junction disorder
Lambert-Eaton myasthenic syndrome (LEMS) is a rare neuromuscular junction disorder that affects communication between nerves and muscles. It is characterised by muscle weakness of the limbs, with the legs being more affected than the arms. This can lead to difficulties in climbing stairs and rising from a sitting position. The weakness from LEMS is often temporarily relieved after exertion or physical exercise, but high temperatures can worsen the symptoms.
LEMS can manifest as a paraneoplastic syndrome or a primary autoimmune disorder. Paraneoplastic LEMS is a condition that arises as a result of cancer elsewhere in the body, with around 60% of LEMS patients having an underlying malignancy. The majority of cases are associated with small-cell lung cancer (SCLC), but it has also been linked to various other cancers, including non-SCLC, lymphosarcoma, malignant thymoma, and carcinomas of the breast, stomach, colon, prostate, bladder, kidney, gallbladder, and rectum. In cases of LEMS not associated with an underlying malignancy, the age and gender distribution are similar to that of myasthenia gravis (MG), with a peak onset age of 35 and a larger peak at 60.
The primary clinical symptom of LEMS is muscle weakness, which is driven by the development of antibodies that target voltage-gated calcium channels (VGCCs) on presynaptic nerve terminals. This results in a reduced release of the acetylcholine (ACh) neurotransmitter. The diagnosis of LEMS is usually confirmed with electromyography and blood tests, and the initial recommended imaging study is a computed tomography (CT) or magnetic resonance imaging (MRI) chest scan.
Treatment options for LEMS include Firdapse, which increases the release of acetylcholine to improve muscle function and relieve symptoms. Intravenous immunoglobulin (IVIG), steroids, azathioprine, and plasma exchange are also used to suppress the immune system and remove antibodies. Direct treatment of the associated cancer, if present, can often relieve the symptoms of LEMS.
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Myopathies: conditions directly affecting skeletal muscles, excluding injuries
Myopathies are conditions that directly affect skeletal muscles, excluding injuries such as tears, strains, or bruises. These diseases attack muscle fibres, causing weakness and sometimes pain or paralysis. There are several types of myopathies, some of which are genetic and inherited, while others are developed later in life.
One group of myopathies is muscular dystrophies, which refer to a collection of over 30 genetic conditions that cause muscle weakness and other symptoms. The symptoms of muscular dystrophy worsen over time, and they can be present at birth, develop in childhood, or arise in adulthood. The most common form is Duchenne muscular dystrophy, primarily affecting boys but also occurring in milder forms in girls. Other common types include Becker muscular dystrophy, myotonic dystrophy, congenital muscular dystrophy, distal muscular dystrophy, and oculopharyngeal muscular dystrophy. Muscular dystrophies can affect various muscles and body parts, including the heart, lungs, eyes, brain, and other organs.
Another type of myopathy is congenital myopathy, which can cause overall muscle weakness and may include symptoms such as joint stiffness or looseness, spinal curvature, breathing issues, intellectual disabilities, learning disabilities, or seizures. Inflammatory myopathy and progressive muscle weakness are also mentioned as disorders with symptoms similar to muscular dystrophy, but they are caused by different genetic defects.
Myopathies can be challenging to diagnose due to overlapping symptoms and the presence of sporadic cases with no known genetic cause. Treatment options include medications, physical therapy, occupational therapy, and, when necessary, surgery. While there is currently no cure for myopathies, research is ongoing in the fields of genetic therapies and new medications.
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Myotonic dystrophy: difficulty relaxing muscles after use, affecting heart and lungs
Myotonic dystrophy is a genetic condition that causes progressive muscle weakness and wasting. It is a type of muscular dystrophy, a group of more than 30 inherited (usually genetic) conditions that affect muscle function. Myotonic dystrophy can affect muscles of movement and often impacts the heart, lungs, brain, eyes, and reproductive system. It can also cause diabetes and thyroid problems.
There are two types of myotonic dystrophy, DM1 and DM2. DM1 is more common and more severe than DM2. DM2 has similar symptoms to DM1 but tends to be milder. DM2 causes weakness in muscles close to joints, and patients may experience cataracts or heart problems. DM1 is caused by a change in the DMPK gene, which is found on chromosome 19. This change leads to an abnormal increase in a repeated section of genetic code, known as CTG repeats. Generally, a higher number of repeats means more severe symptoms and an earlier onset.
Myotonia is a key symptom of myotonic dystrophy, causing muscle stiffness and making it difficult to relax muscles after use. This mostly affects the hands and jaw. Myotonia can be improved by activating and repeatedly using the muscles, a process called the 'warm-up phenomenon'. It can also be managed with medication. DM1 often affects the heart's electrical system, leading to arrhythmias (irregular heartbeats) and potentially life-threatening problems. Heart problems can begin even when muscle weakness is mild, and regular heart check-ups are important for early detection and management.
There is currently no cure for myotonic dystrophy, but treatments and therapies can help manage symptoms and improve patients' quality of life. Doctors may prescribe medication to improve heart function, and patients might have a pacemaker or ICD (implantable cardioverter defibrillator) inserted to aid with heart function. Medication, such as mexiletine, can also be used to help with muscle stiffness. Sleep problems are common in patients with myotonic dystrophy and can be managed with medication following a heart and lung health check.
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Frequently asked questions
Muscle syndrome is an umbrella term for a range of conditions that affect the muscles or the nerves that control them. These conditions can be genetic or caused by other factors such as alcohol use disorder, malnutrition, or toxic exposures.
Symptoms of muscle syndrome vary depending on the specific condition but can include muscle weakness, pain, atrophy, and even paralysis. In some cases, muscle syndrome can affect the heart and lungs, leading to cardiac failure or breathing issues.
A physician will typically examine a patient's medical and family history, check their reflexes and muscle strength, and evaluate other symptoms. If muscle syndrome is suspected, further diagnostic tests may be ordered, including electromyography (EMG), nerve conduction studies, and muscle biopsies.
Currently, there is no cure for muscle syndrome, but treatments are available to manage symptoms and improve quality of life. These treatments include medications, physical therapy, occupational therapy, and, in some cases, surgery. Research is ongoing to develop genetic therapies and new medications to find a cure.
