Logan Steele
Muscle death, or rhabdomyolysis, is a rare but serious condition caused by direct or indirect muscle injury, resulting in the breakdown of muscle tissue and the release of toxic muscle fiber contents into the bloodstream. This can lead to kidney damage and even death. Rhabdomyolysis can be caused by various factors, including severe or intense physical activity, crush injuries, certain medications, and medical conditions. Additionally, muscle atrophy, the wasting or thinning of muscle mass, can be a precursor to muscle death and is often caused by disuse or neurogenic conditions. Understanding the causes and symptoms of muscle death is crucial for prompt diagnosis and treatment, which can significantly impact recovery and outcomes.
| Characteristics | Values |
|---|---|
| Muscle death | Rhabdomyolysis |
| Cause | Direct or indirect muscle injury, crush injury, alcohol or <co: 7,10>drug use, exercise, ageing, starvation, immobilization, denervation, inflammation, muscle diseases, cancer, genetic conditions, metabolic or mitochondrial conditions, medication, severe burn, electrocution, dehydration, overheating |
| Symptoms | Muscle stiffness, weak and sore muscles, muscle swelling, colour change in urine, loss of consciousness, kidney damage, fatigue, memory loss, trouble walking or balancing, difficulty swallowing or speaking, facial weakness, numbness or tingling in arms and legs |
| Treatment | Surgery, intensive care, treatment of underlying medical condition, medication, fluids, kidney dialysis, diuretics, bicarbonate, physical therapy, ultrasound therapy, exercise, healthy diet |
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What You'll Learn
- Rhabdomyolysis: a rare, life-threatening condition where muscle fibres break down and leak into the bloodstream
- Muscle atrophy: thinning or loss of muscle tissue due to disuse or neurogenic conditions
- Age-related: muscle cell death affects fibre morphology and number
- Pathological changes: atrophy caused by ageing, starvation, immobilisation, inflammation, etc
- Medical conditions: genetic conditions like McArdle disease and certain metabolic disorders increase risk
Rhabdomyolysis: a rare, life-threatening condition where muscle fibres break down and leak into the bloodstream
Rhabdomyolysis is a rare, life-threatening condition where skeletal muscle fibres break down and leak into the bloodstream. This can be caused by a direct or indirect muscle injury, such as a crush injury, or strenuous exercise. The symptoms of rhabdomyolysis can range from mild to severe, and include weak and sore muscles, muscle stiffness, and a change in urine colour, which can appear dark brown, red or tea-coloured. This discolouration is caused by the presence of myoglobin in the urine, which can cause acute kidney injury and even kidney failure.
The condition is considered complex and can be caused by any form of muscle damage, or by any entity that causes muscle damage. This includes trauma, crush injuries, falls, long-lasting muscle compression, immobilisation, and medical conditions such as diabetes or thyroid disorders. Certain medications can also cause rhabdomyolysis, including antipsychotics, antidepressants, and statins. Substance use disorder, including the use of alcohol and illegal drugs, can also be a cause.
Rhabdomyolysis is reported about 26,000 times a year in the United States and was first described in the early 1900s in German medical literature, where it was termed Meyer-Betz disease. The condition has been observed throughout history, with one of the earliest descriptions appearing in the Old Testament's Book of Numbers, which records a plague suffered by the Jews during their exodus from Egypt after consuming large amounts of quail.
Treatment for rhabdomyolysis should be sought as soon as possible to reduce the risk of permanent kidney damage. Treatment is mainly supportive, focusing on the management of the ABCs (airway, breathing, circulation) and preserving renal function, including vigorous rehydration. In some cases, surgery may be required to ease tension or pressure and loss of circulation.
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Muscle atrophy: thinning or loss of muscle tissue due to disuse or neurogenic conditions
Muscle atrophy, or muscle wasting, is the thinning or loss of muscle tissue. It can be caused by disuse of muscles or neurogenic conditions. Disuse atrophy occurs when muscles are not used enough, leading to a decrease in muscle size and strength. This can be due to a sedentary lifestyle, malnutrition, inadequate exercise, desk jobs, extended bed rest, genetic disorders, or age-related factors. Disuse atrophy can often be reversed through regular exercise, physical therapy, and improved nutrition.
Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases affecting the nerves that connect to the muscles. When these nerves are damaged, they cannot trigger the necessary muscle contractions, leading to a sudden loss of muscle activity. Neurogenic atrophy is typically more severe and sudden than disuse atrophy. Examples of conditions that can lead to neurogenic atrophy include amyotrophic lateral sclerosis (ALS), carpal tunnel syndrome, polio, and various injuries or illnesses that damage the nerves controlling muscles.
The symptoms of muscle atrophy include reduced muscle mass, with one limb sometimes being smaller than the other. Other symptoms may include weakness, numbness, and tingling in the limbs, as well as difficulty walking, balancing, swallowing, or speaking. In some cases, facial weakness and gradual memory loss may also be observed. The time it takes for muscle atrophy to develop depends on age, fitness level, and the specific cause of the atrophy.
To diagnose muscle atrophy, healthcare providers will conduct a physical examination and discuss the patient's symptoms. They may also order additional tests, such as blood tests, muscle or nerve biopsies, electromyography (EMG), nerve conduction studies, computed tomography (CT) scans, or magnetic resonance imaging (MRI) scans. Treatment options for muscle atrophy include physical therapy, lifestyle changes, and in some cases, surgery.
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Age-related: muscle cell death affects fibre morphology and number
Skeletal muscles can be induced to die through different mechanisms, mainly via apoptosis, autophagy, and necrosis. Muscle death may occur due to various physiological and pathological conditions, including aging. Age-related muscle cell death affects fibre morphology and number.
A study by Kletzien et al. in 2018 investigated the age-related effect of cell death on tongue muscle fibre morphology and number in rats. The study found significant increases in cell death, caspase-3, and Bcl-2 in the extrinsic tongue muscles of old rats, along with reductions in muscle fibre number. The increase in apoptosis indices with age suggests that apoptotic processes may contribute to the degradation of cranial functions with age.
Another study by Fogarty et al. in 2021 examined the contractile, fatigue, and fibre type properties of tongue muscles in rats. This study also found evidence of age-related cell death in the tongue muscle, with significant increases in cell death observed in the genioglossus, styloglossus, and hyoglossus muscles of old rats compared to young adult rats.
Age-related changes in muscle structure and morphology have been documented, including an increase in intramuscular connective tissue and extracellular matrix. These changes can impact the accuracy of fibre counts in muscle cross-sections. Muscle fibre shortening contributes to age-related loss of muscle mass, and a net loss of fibres across age has been detected.
Additionally, motor units undergo age-related adaptations, including changes in morphology and behaviour, which result in reduced muscle performance. Advancing age is associated with a reduced motor unit number and an increased number of muscle fibres per motor unit due to compensatory collateral sprouting by surviving neurons. Age-related remodelling of motor units involves the denervation of fast muscle fibres and re-innervation by slow motor neurons, leading to changes in fibre-type distribution.
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Pathological changes: atrophy caused by ageing, starvation, immobilisation, inflammation, etc
Skeletal muscles may undergo pathological changes in response to various stimuli, leading to atrophy and a consequent loss of muscle strength and function. Pathological atrophy can be caused by ageing, starvation, immobilisation, inflammation, and other factors.
Ageing is associated with a gradual decrease in the ability to maintain skeletal muscle function and mass, a condition known as sarcopenia. This condition may be related to a combination of factors, including the failure of satellite cells to regenerate skeletal muscle fibres and a decrease in the availability of critical secreted growth factors necessary for muscle maintenance. The prevalence of sarcopenia is estimated to be between 5-13% in individuals aged 60-70, increasing to 11-50% in those over 80 years of age. Sarcopenia is characterised by a reduction in muscle tissue quality, an increase in fibrosis, changes in muscle metabolism, oxidative stress, and degeneration of the neuromuscular junction. Additionally, ageing sarcopenic muscle exhibits an accumulation of mitochondrial DNA mutations, with denser regions of clones containing mitochondrial mutations.
Starvation and poor nourishment can also contribute to muscle atrophy. Older adults may require higher amounts of protein compared to younger individuals to prevent muscle atrophy.
Immobilisation or prolonged immobility, such as extended bed rest or having a body part in a cast, can lead to disuse atrophy of muscles and bones, resulting in loss of mass and strength. This type of atrophy is usually reversible with exercise, unless severe.
Inflammation is another factor that can contribute to muscle atrophy. For example, a deficiency of the protein BNIP3 leads to muscle inflammation and atrophy. Additionally, inflammatory conditions such as human immunodeficiency virus (HIV) infection can impact muscle metabolism and body composition.
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Medical conditions: genetic conditions like McArdle disease and certain metabolic disorders increase risk
Muscle death, or rhabdomyolysis, can be caused by certain medical conditions, including genetic conditions like McArdle disease and certain metabolic disorders. McArdle disease is a rare muscle disorder where the muscle cells cannot break down a complex sugar called glycogen. This is because an important enzyme, myophosphorylase, is missing from the muscle cells. As a result, the muscles cannot use the stored glycogen to get the glucose they need to function properly. This can lead to critical episodes of early fatigue when exercising, muscle pain, myoglobinuria (when muscles break down and release myoglobin in urine, turning it brown or red), and subsequent kidney failure.
McArdle disease is inherited and caused by changes in the gene for the enzyme muscle phosphorylase. Generally, a person with McArdle disease needs to have two copies of the mutated gene, although symptoms can occur in people with only one copy. Symptoms often appear in childhood, but some people with the condition are not diagnosed until adulthood. While there is no cure, certain diet and exercise strategies can help control the problem. For example, a well-designed low- or moderate-intensity exercise routine can help the body get the most out of its ability to use glucose. However, overdoing exercise can harm the muscles and kidneys in people with McArdle disease.
Metabolic myopathies are another group of rare, inherited metabolic disorders that can cause muscle death. They are caused by different genetic defects that impair the body's metabolism, specifically the chemical reactions involved in drawing energy from food. Muscles require a lot of energy to work properly, and these disorders interfere with the chemical reactions that generate energy. This can lead to muscle weakness, exercise intolerance, muscle pain, and swollen or tender muscles. Metabolic myopathies can also cause rhabdomyolysis, where muscle tissue gets damaged and substances from inside the muscle cells enter the bloodstream.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse or neurogenic conditions. Physiologic atrophy can be reversed with exercise and a healthy diet, whereas neurogenic atrophy cannot be reversed due to physical nerve damage.
Symptoms of muscle atrophy include a decrease in muscle mass, weakness, numbness, and tingling in the limbs.
Rhabdomyolysis is a rare, serious, and potentially life-threatening condition caused by direct or indirect muscle injury, resulting in muscle breakdown. This leads to the release of toxic muscle fibre contents into the bloodstream, which can cause kidney damage and even death.
Rhabdomyolysis can be caused by various factors, including crush injuries, high-intensity exercise without rest, certain medications, substance use, and medical conditions such as diabetes or thyroid disorders.
