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Heart failure is a condition that usually develops slowly and gets progressively worse. It is caused by a variety of factors, including coronary heart disease, heart attack, high blood pressure, inflammation of the heart muscle, and congenital heart defects. The condition affects the heart's ability to pump blood efficiently, leading to reduced blood supply to the body and vital organs. This can result in muscle weakness and fatigue, as the muscles do not receive adequate oxygen and nutrients. Studies have shown that patients with heart failure experience skeletal muscle weakness and fatigability, impacting their physical function and ability to perform everyday tasks. The underlying mechanisms involve alterations in the quantity and functionality of the myosin molecule in skeletal muscle, leading to reduced tension and impaired performance. Understanding the causes of muscle weakness in heart failure patients is crucial for developing rehabilitative strategies and improving their quality of life.
| Characteristics | Values |
|---|---|
| Heart failure definition | The inability of the heart to supply the periphery with adequate nutrients and oxygen |
| Types of heart failure | Diastolic heart failure, systolic heart failure, pre-heart failure |
| Heart failure causes | Coronary heart disease, heart attack, high blood pressure, inflammation of the heart muscle, congenital heart defects |
| Heart failure symptoms | Shortness of breath, swelling in the abdomen, legs and feet, fatigue, exercise intolerance |
| Heart failure and muscle weakness | Heart failure can cause muscle wasting and weakness, making it difficult to perform everyday tasks or exercise |
| Mechanisms of muscle weakness in heart failure | Loss of myosin protein from single skeletal muscle fibers, reduced contractile performance, reduced tension in slow-twitch muscle fibers |
| Treatment for muscle weakness in heart failure | Aerobic and resistance exercise training can partly rescue muscle wasting and weakness |
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What You'll Learn
- Heart failure can cause muscle wasting and weakness
- Cardiac dysfunction is not the sole cause of exercise intolerance
- Systolic heart failure causes the heart muscle to become weak
- High blood pressure can cause the heart muscle to become weak
- MicroRNAs can make muscle cells more susceptible to breaking down
Heart failure can cause muscle wasting and weakness
Heart failure is a condition that usually develops slowly and gets worse over time. It is characterised by the inability of the heart to pump blood adequately or fill adequately. This can lead to reduced blood supply to the heart, causing the heart muscle to become weak and damaged. As a result, the heart may not be able to pump enough blood around the body, leading to symptoms such as shortness of breath and swelling in the abdomen, legs and feet.
Heart failure can also cause muscle wasting and weakness in the skeletal muscles. This is due to a combination of factors, including impaired protein synthesis and degradation rates, altered satellite cell dynamics, and disrupted calcium homeostasis. These factors contribute to fibre atrophy, contractile dysfunction, and impaired regeneration, leading to muscle wasting and weakness. Additionally, heart failure can cause a selective loss of the contractile protein myosin from single muscle fibres, reducing tension in slow-twitch muscle fibres and contributing to overall muscle weakness.
The muscle weakness caused by heart failure can make it difficult for individuals to perform everyday tasks or exercise. It can limit physical function and contribute to high rates of physical disability. The severity of heart failure and the resulting muscle weakness can be measured by the ejection fraction, which represents how much blood is pumped out with each beat. A healthy heart has an ejection fraction of 50% or higher.
Rehabilitation strategies and treatments for individuals with heart failure aim to improve motor performance and functional capacity. Exercise training, including aerobic and resistance exercises, can partially rescue muscle wasting and weakness. Additionally, understanding the specific mechanisms underlying muscle weakness in heart failure can help develop targeted treatments to restore muscle mass and improve quality of life.
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Cardiac dysfunction is not the sole cause of exercise intolerance
Exercise intolerance is a common symptom of heart failure, and it is associated with a poor quality of life and increased mortality. While impaired cardiac reserve is considered central to heart failure, reduced exercise capacity is the result of multiple factors, including aging, impaired pulmonary reserve, and peripheral and respiratory skeletal muscle dysfunction.
Indeed, evidence suggests that cardiac dysfunction alone does not contribute to exercise intolerance. Skeletal muscle dysfunction, including muscle wasting and weakness, is a significant factor in exercise intolerance in patients with heart failure. This is characterized by a reduction in skeletal muscle mass and functionality, which complicates exercise tolerance assessment. Conditions such as sarcopenia and cachexia, which are prevalent in patients with heart failure, are strong predictors of exercise intolerance.
Additionally, several other mechanisms contribute to reduced exercise capacity in patients with heart failure. These include reduced pulmonary reserve, cardiovascular reserve, and peripheral skeletal muscle dysfunction. Furthermore, independent conditions such as chronic obstructive lung disease, anemia, deconditioning, and obesity may further limit exercise capacity in these patients.
Depression is also highly prevalent in patients with heart failure and is associated with adverse cardiovascular outcomes and a worsening of exercise capacity. However, the independent effect of depression on exercise capacity has not been well investigated. Nevertheless, it is clear that cardiac dysfunction is not the sole cause of exercise intolerance, and addressing skeletal muscle dysfunction and other contributing factors is crucial for improving motor performance and functional capacity in patients with heart failure.
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Systolic heart failure causes the heart muscle to become weak
Heart failure is the inability of the heart to supply the body with adequate nutrients and oxygen. It is either defined by the inability of the heart to pump blood adequately (heart failure with reduced ejection fraction, HFrEF) or the inability of the heart to fill adequately (heart failure with preserved ejection fraction, HFpEF).
Systolic heart failure is a type of heart failure that occurs when the left ventricle of the heart is weak and cannot pump blood efficiently. The left ventricle is the largest and strongest chamber of the heart, responsible for pumping oxygen-rich blood from the lungs to the rest of the body. When the left ventricle is weak, it can cause fluid to build up in the lungs, resulting in shortness of breath, fatigue, and swelling in the body, including the belly, feet, and legs.
Systolic heart failure is typically caused by another cardiovascular condition that weakens the heart muscle. For example, aortic stenosis, a narrowing of the valve in the large blood vessel that branches off the heart (the aorta), or mitral regurgitation, when a valve in the heart doesn't close tightly, allowing blood to flow backward. Other causes include coronary artery disease, high blood pressure, previous heart attack, abnormal heart rhythm, alcohol use disorder, and heart valve disease.
The damage caused by these conditions can create a scar in the heart muscle, stretch the ventricle, or make it stiff, all of which will weaken the ventricle and reduce the ejection fraction. Treatment for systolic heart failure aims to address the underlying causes, relieve symptoms, and improve overall heart function. This may involve a combination of medications, lifestyle changes, and, in advanced cases, surgery.
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High blood pressure can cause the heart muscle to become weak
Heart failure is a condition that usually develops slowly and gets progressively worse. It is characterised by the inability of the heart to supply the body's periphery with adequate nutrients and oxygen. This can be due to the heart's inability to pump blood adequately (heart failure with reduced ejection fraction, HFrEF) or the inability to fill adequately (heart failure with preserved ejection fraction, HFpEF).
High blood pressure (hypertension) is one of the causes of heart failure. When blood pressure is high, the heart has to work harder than normal to pump blood around the body. Over time, this can cause the heart muscle to become too stiff or weak to pump blood properly. This is because high blood pressure can lead to a build-up of atherosclerotic plaque in the arteries, reducing blood supply to the heart and damaging the heart muscle.
As a result of this damage, the heart muscle may become too weak to pump enough blood around the body. This is known as systolic heart failure or heart failure with reduced ejection fraction. In this type of heart failure, the heart muscle fails to pump blood effectively, causing fluid to build up and pool around the lungs and other parts of the body. This can lead to symptoms such as shortness of breath and swelling in the abdomen, legs, and feet.
In addition to affecting the heart's ability to pump blood, high blood pressure can also contribute to skeletal muscle weakness in individuals with heart failure. Studies have shown that patients with chronic heart failure frequently experience skeletal muscle weakness, limiting their physical function and contributing to high rates of physical disability. This is due to a selective loss of the contractile protein myosin from single muscle fibres, which reduces tension in slow-twitch muscle fibres.
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MicroRNAs can make muscle cells more susceptible to breaking down
Heart failure is the inability of the heart to supply the periphery with adequate nutrients and oxygen. This can lead to skeletal muscle fatigability, which is characterised by weakness and exhaustion during rest or while performing a motor task.
Research has found that certain microRNAs (miRNAs) make muscle cells more susceptible to breaking down. MiRNAs are small, non-coding RNA molecules that are evolutionarily conserved and tissue-specific. They regulate gene expression through mRNA degradation or the inhibition of protein translation. MiRNAs can be packaged in exosomes/microvesicles secreted by cells and play a role in cell-to-cell signalling and communication.
In the context of muscle weakness, miRNAs have been found to make muscle cells more sensitive to a protein called myostatin, which causes muscles to break down. Certain individuals possess specific patterns of miRNAs that make them more susceptible to muscle wasting due to ineffective muscle repair. For example, MicroRNA-199a is induced in dystrophic muscle and affects WNT signalling, cell proliferation, and myogenic differentiation.
Additionally, microvesicles containing miRNAs have been found to promote muscle cell death in cancer cachexia via the TLR7 pathway. Tumour-secreted microvesicles contain elevated levels of miR-21, which induces myoblast apoptosis.
Further research is needed to fully understand the role of miRNAs in skeletal muscle health and disease. However, the current understanding suggests that miRNAs play a crucial role in maintaining healthy cellular function and may provide novel therapeutic targets for muscular disorders.
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Frequently asked questions
Yes, heart failure can cause muscle weakness. Patients with chronic heart failure often experience skeletal muscle weakness, which limits their physical function and contributes to high rates of physical disability.
The mechanisms underlying muscle weakness are not entirely clear, but studies have shown that heart failure alters the quantity and functionality of the myosin molecule in skeletal muscle, leading to reduced tension in myosin heavy chain I fibres.
Heart failure can occur due to various reasons, such as coronary heart disease, a heart attack, high blood pressure, inflammation of the heart muscle, or congenital heart defects. It typically begins with the left side of the heart, specifically the left ventricle, which is the heart's main pumping chamber.
