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Muscle atrophy, or muscle wasting, is the loss or thinning of muscle tissue and mass. It can be caused by various conditions, including neurological disorders, autoimmune diseases, genetic disorders, malnutrition, and aging. Specific diseases that cause muscle loss include amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), muscular dystrophy, cancer cachexia, and sarcopenia. Muscle atrophy can lead to a decrease in strength and mobility, impacting an individual's ability to perform everyday tasks and reducing their quality of life. Early diagnosis and treatment are crucial to prevent or slow the progression of muscle loss.
| Characteristics | Values |
|---|---|
| Name of the disease | Muscle atrophy/wasting |
| Other names | Sarcopenia, Neuromuscular disorders, Muscular dystrophy |
| Cause | Malnutrition, Age, Genetics, Lack of physical activity, Neurogenic atrophy, Disuse atrophy |
| Neurogenic atrophy causes | Injury, Diseases affecting nerves that connect to muscles |
| Diseases that cause neurogenic atrophy | Amyotrophic lateral sclerosis (ALS), Guillain-Barre syndrome, Carpal tunnel syndrome, Multiple sclerosis, Spinal cord injury |
| Disuse atrophy causes | Sedentary lifestyle, Malnourishment, Lack of exercise, Genetic disorders, Stroke, Dermatomyositis |
| Genetic disorders that cause disuse atrophy | Muscular dystrophy, Charcot-Marie-Tooth disease |
| Types of muscular dystrophy | Duchenne muscular dystrophy, Becker muscular dystrophy, Emery-Dreifuss muscular dystrophy, Myotonic muscular dystrophy |
| Other causes of muscle wasting | Cancer, Heart failure, Sepsis, Anorexia nervosa, Chronic inflammation, Neurological disorders |
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Muscular dystrophy
Symptoms of muscular dystrophy can include challenges with movement, such as frequent falls, trouble running and jumping, and a waddling gait. The facial and neck muscles are often the first to be affected, leading to difficulty in swallowing and speaking. As the disease progresses, it can cause scoliosis, or a curved spine, and affect the heart's ability to pump blood and maintain a regular rhythm.
The main goal of treatment for muscular dystrophy is to manage symptoms and improve quality of life. Treatments can include physical and occupational therapies to strengthen and stretch muscles, corticosteroids to delay muscle weakness and improve lung function, mobility aids such as canes and wheelchairs, and surgery to correct spine curvature and relieve tension in contracted muscles. While there is currently no cure for muscular dystrophy, researchers are actively working towards one.
Diagnosing muscular dystrophy typically involves a range of tests, including creatine kinase blood tests, genetic tests, muscle biopsies, and electromyography (EMG) to measure electrical activity in muscles and nerves. The specific symptoms and age of onset can vary depending on the type of muscular dystrophy, with some types starting in childhood and others not manifesting until adulthood.
Overall, muscular dystrophy is a serious condition that can lead to significant disability and deformity. While treatments can help manage symptoms and slow the progression of the disease, it currently has no cure.
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Neurogenic atrophy
Diseases and conditions that can lead to neurogenic atrophy include Amyotrophic Lateral Sclerosis (ALS or Lou Gehrig's disease), Guillain-Barre syndrome, carpal tunnel syndrome, spinal cord injuries, and multiple sclerosis. These conditions affect the nerves that control muscles, leading to neurogenic atrophy.
It is important to consult a healthcare provider for a proper diagnosis and treatment plan. They may perform a physical examination, order specific tests, and recommend suitable treatments based on the underlying cause of the neurogenic atrophy.
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Malnutrition
Low muscle mass is a critical consequence of malnutrition. Muscle mass plays a vital role in maintaining an individual's health, quality of life, and longevity. It influences energy and protein metabolism throughout the body. When the body is malnourished, it breaks down amino acids stored as protein in the muscles to provide energy, leading to muscle wasting or atrophy. This breakdown of muscle mass can further contribute to local and systemic chronic inflammation, impacting metabolism and appetite regulation.
Additionally, low muscle mass due to malnutrition has been associated with poor health outcomes in various disease states. For example, in chronic obstructive pulmonary disease (COPD), cancer, and cardiovascular disease, low muscle mass can lead to poor respiratory function, increased risk of readmission, longer hospital stays, and higher mortality rates. Therefore, managing malnutrition should prioritize maintaining and minimizing muscle mass loss rather than solely focusing on body weight.
In summary, malnutrition is a significant contributor to muscle loss, particularly in older adults and individuals with certain health conditions. The breakdown of muscle mass due to malnutrition can lead to a range of negative health consequences, emphasizing the importance of early recognition and nutritional assessment to prevent and manage muscle wasting.
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Multiple sclerosis
Muscle atrophy, or muscle wasting, can be caused by a variety of factors, including neurogenic conditions. Multiple sclerosis (MS) is one such disease that can lead to muscle loss. It is a chronic, neurological autoimmune disease where the immune system attacks the nerves, destroying myelin, an insulating substance that protects nerve fibers.
As a result of this nerve damage, scar tissue can form, disrupting the transmission of nerve signals from the brain to other parts of the body. This disruption can cause muscles to become stiff or weak, reducing a person's ability to move and perform everyday activities. The weakness associated with MS often affects only one side of the body, or it may be limited to the legs or trunk.
The impact of MS on muscle function is twofold. Firstly, the immediate damage caused by MS to the central nervous system (CNS) can alter neural activation, disrupting neuromotor transmission and affecting muscle function. Secondly, the chronic nature of the disease can lead to reduced mobility and extreme fatigue, resulting in physically inactive lifestyles that further negatively impact skeletal muscle health. This can lead to a reduced capacity to produce, regulate, and sustain the muscle contractions necessary for movement, thereby contributing to impaired mobility, which is a common symptom of MS.
In addition to mobility issues, muscle atrophy in people with MS can increase the risk of falls and fall-related injuries, such as bone fractures. The decreased muscle strength and skeletal muscle dysfunction associated with MS can make it difficult for individuals to maintain their balance and stability, leading to an increased likelihood of falling.
While MS can cause muscle atrophy and weakness, the extent and progression of these symptoms can vary among individuals. The impact of MS on muscle health is influenced by factors such as age, fitness level, and the specific health condition of the person affected.
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Sarcopenia
The degree of sarcopenia is determined by two factors: the initial amount of muscle mass and the rate at which muscle mass declines. The rate of muscle loss is influenced by exercise levels, co-morbidities, nutrition, and other factors. Immobility significantly increases the rate of muscle loss, even in younger individuals. Other factors that can accelerate sarcopenia include decreased nutrient intake, low physical activity, and chronic diseases such as chronic obstructive pulmonary disease (COPD), chronic heart failure (CHF), chronic kidney disease (CKD), diabetes mellitus, and human immunodeficiency virus (HIV).
The pathologic changes associated with sarcopenia include a reduction in muscle tissue quality, an increase in fibrosis, changes in muscle metabolism, oxidative stress, and degeneration of the neuromuscular junction. These changes can lead to a buildup of non-contractile material in the skeletal muscle, contributing to sarcopenic muscle. Additionally, there is a decrease in type II muscle fibres ("fast twitch") and a relative preservation of type I muscle fibres ("slow twitch").
The main symptom of sarcopenia is muscle weakness, which can make everyday tasks more challenging. Other symptoms may include loss of stamina, difficulty performing daily activities, slow walking, trouble climbing stairs, poor balance, and an increased risk of falls and fractures. Sarcopenia can greatly impact an individual's quality of life and increase the risk of complications, hospitalisations, and surgeries.
While sarcopenia is strongly associated with ageing, the underlying mechanisms are not fully understood and likely involve multiple interacting factors. Changes in hormones, immobility, age-related muscle changes, nutrition, and neurodegenerative changes have all been implicated in the development of sarcopenia. Researchers have also found that early environmental influences may have long-term effects on muscle health, with low birth weight being linked to reduced muscle mass and strength in adulthood.
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Frequently asked questions
Muscle atrophy is the loss or thinning of muscle tissue. It can be caused by disuse of muscles or neurogenic conditions. Physiologic atrophy occurs when muscles aren't used enough, causing the body to break them down, while neurogenic atrophy is caused by nerve problems or diseases that affect nerve connections to the muscles.
Diseases that cause muscle atrophy include amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), carpal tunnel syndrome, spinal cord injuries, muscular dystrophy, and cancer cachexia. Muscular dystrophy is a group of inherited diseases that cause muscle weakness and wasting.
Symptoms of muscle atrophy include a decrease in muscle mass and strength, leading to reduced functionality and quality of life. Specific symptoms depend on the type of atrophy and affected muscle groups. Limb atrophy may cause tingling, numbness, or weakness, while facial atrophy may cause difficulty speaking or swallowing.
