Dominic Stone
Heart muscle dysfunction, also known as cardiomyopathy, is a group of primary diseases that affect the heart muscle. Cardiomyopathy can be caused by a variety of factors, including genetics, other medical conditions, unhealthy lifestyle factors, or extreme stress. It can cause the heart muscle to become thicker, stiffer, or larger than normal, which weakens the heart and makes it harder for the heart to pump blood efficiently. This can lead to symptoms such as fatigue, shortness of breath, heart palpitations, and swelling of the legs. Cardiomyopathy treatments aim to manage symptoms and slow down the disease's progression, but they do not cure the condition.
| Characteristics | Values |
|---|---|
| Definition | Disorders characterized by morphologically and functionally abnormal myocardium |
| Types | Hypertrophic cardiomyopathy, dilated cardiomyopathy, restrictive cardiomyopathy, arrhythmogenic right ventricular dysplasia, and Takotsubo cardiomyopathy (broken heart syndrome) |
| Symptoms | Fatigue, shortness of breath, heart palpitations, swelling of the legs, irregular heartbeat, fainting, heart failure, cardiac arrest, cardiogenic shock |
| Causes | Genetic (familial), non-genetic (acquired), abnormal genes in the heart muscle, viral infections, myocarditis, ischemic cardiomyopathy, eosinophilic myocarditis, inflammation of and injury to heart tissue, stress, unhealthy lifestyle factors, long-term use of cocaine or alcohol |
| Treatment | Medicines, procedures, healthy lifestyle changes, implanted devices, therapy to lower stress, cardiac implantable electronic devices (CIEDs), heart transplant |
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What You'll Learn
Cardiomyopathy types
Cardiomyopathy is a group of primary diseases that affect the heart muscle. It makes it difficult for the heart to pump blood to the rest of the body. Cardiomyopathies can be of genetic (familial) or non-genetic (acquired) origin. They are either confined to the heart or are part of a generalised systemic disorder, often leading to cardiovascular death or progressive heart failure-related disability.
There are several types of cardiomyopathies, differing based on their cause and how they affect the heart's structure and function. Some types are rarer than others, and all types weaken the heart muscle. The various types of the disease have many causes, signs, symptoms, and treatments. Here are some of the most common types of cardiomyopathy:
Hypertrophic Cardiomyopathy
This type of cardiomyopathy occurs when the heart muscle becomes larger and thicker than normal. The thickened areas can block the ventricles, making it harder for the heart to pump blood. It is commonly inherited, and first-degree relatives should be alerted and screened for the disease.
Dilated Cardiomyopathy
This is a common type of cardiomyopathy that happens when the ventricles (the lower chambers of the heart) weaken and get larger. The weakened ventricles don't pump well, making the heart work harder. It may be inherited or result from alcohol, heavy metals, coronary artery disease, cocaine use, and viral infections.
Restrictive Cardiomyopathy
This is a rare type of cardiomyopathy that causes the ventricles to stiffen. Because of this, the ventricles can't relax and don't fill with enough blood to pump to the rest of the body. Transthyretin amyloid cardiomyopathy is a type of restrictive cardiomyopathy that is more common in Black men.
Arrhythmogenic Right Ventricular Dysplasia
This type of cardiomyopathy is more common in young people. It can lead to arrhythmias or irregular heartbeats.
Takotsubo Cardiomyopathy (Broken Heart Syndrome)
This is a rare condition that develops when extreme emotional or physical stress causes the heart muscle to stop working properly. It usually affects more women than men and is more common after menopause. The heart usually recovers within 3 to 4 weeks with medicine.
Peripartum Cardiomyopathy
This type of cardiomyopathy occurs during or after pregnancy, developing late in pregnancy or within a few months after giving birth. It is rare but serious.
Ischemic Cardiomyopathy
This type of cardiomyopathy is not formally included in the classification, as it is a direct result of another cardiac problem.
Unclassified Cardiomyopathy
This type of cardiomyopathy is not specifically categorised.
Stress-induced Cardiomyopathy
Also known as broken heart syndrome, this type of cardiomyopathy usually follows acute emotional stress.
Treatments are available for the various types of cardiomyopathy, including lifestyle changes, medications, and procedures.
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Cardiomyopathy causes
Cardiomyopathy is a group of primary diseases of the heart muscle, which affect the heart's ability to pump blood effectively. Cardiomyopathies can be of genetic (familial) or non-genetic (acquired) origin. In some cases, the cause is unknown.
Genetic Cardiomyopathies
Genetic cardiomyopathies are inherited, passed down from parents to their children through gene mutations. Hypertrophic cardiomyopathy, for instance, is usually inherited, causing the heart muscle to enlarge and thicken. This can block blood flow to the rest of the body and is often a rare disease. Arrhythmogenic cardiomyopathy is also inherited and more common in teens and young adults.
Non-genetic Cardiomyopathies
Non-genetic cardiomyopathies are acquired and can have definitive causes such as viral infections, myocarditis, or other conditions. Dilated cardiomyopathy, for example, can be caused by chronic heavy alcohol use, nutritional deficiencies, certain types of chemotherapy, or even infections. It is also associated with ischemic cardiomyopathy, hypertension, valvular diseases, and genetics. Restrictive cardiomyopathy, another type of cardiomyopathy, is often the result of underlying problems such as amyloidosis, hemochromatosis, scleroderma, or sarcoidosis.
Risk Factors
While the causes of cardiomyopathy may vary, certain risk factors can increase the likelihood of developing the condition. These include a history of heart problems in the family, personal history of heart attacks, long-term substance use, high-stress levels, obesity, and infections.
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Cardiomyopathy risk factors
Cardiomyopathy is a disease of the heart muscle that makes it harder for your heart to pump blood to the rest of your body. It is a serious condition that can lead to heart failure if left untreated. Several risk factors have been identified that increase an individual's likelihood of developing cardiomyopathy.
One of the most significant risk factors is high blood pressure, which can cause the heart muscle to thicken and stiffen over time. This form of cardiomyopathy is called hypertrophic cardiomyopathy and is characterized by a reduction in the size of the heart's left ventricle. Additionally, high blood pressure can lead to heart failure, which in turn damages the heart muscle and leads to dilated cardiomyopathy, where the left ventricle becomes enlarged and pumps blood less efficiently.
Another key risk factor is coronary artery disease, which is the narrowing or blockage of the arteries supplying blood to the heart muscle. This can lead to a form of cardiomyopathy called ischemic cardiomyopathy, where the heart muscle becomes weakened due to reduced blood flow and oxygen supply. People with diabetes or high cholesterol are also at increased risk of coronary artery disease and, by extension, ischemic cardiomyopathy.
Certain genetic or familial dispositions can also increase the risk of developing cardiomyopathy. For example, some people may inherit a tendency to develop cardiomyopathy, especially if they have a family history of the disease. Specific genetic mutations have been identified that are associated with different types of cardiomyopathies, such as dilated cardiomyopathy and hypertrophic cardiomyopathy.
Additionally, certain lifestyle choices can contribute to the risk of cardiomyopathy. Excessive alcohol consumption can lead to alcoholic cardiomyopathy, where long-term alcohol abuse damages the heart muscle. Smoking cigarettes is another risk factor, as it increases the likelihood of developing coronary artery disease and subsequently ischemic cardiomyopathy. An unhealthy diet and lack of physical activity can also contribute to risk factors such as high blood pressure and obesity, which are associated with cardiomyopathy.
Finally, some external factors can play a role in the development of cardiomyopathy. Certain infections, such as viral infections that affect the heart muscle, are a risk factor, especially for children and young adults. Toxins and certain medications can also increase the risk of cardiomyopathy. For example, chemotherapy drugs used to treat cancer can, in some cases, cause cardiomyopathy as a side effect.
It is important to be aware of these risk factors and take steps to mitigate them where possible through lifestyle changes, medical interventions, and regular health check-ups.
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Cardiomyopathy diagnosis
Cardiomyopathy is a group of primary diseases of the heart muscle. It is a progressive condition that worsens over time, causing the heart to enlarge, thicken, stiffen, or weaken. As the disease progresses, symptoms such as shortness of breath, fatigue, swelling of the legs, irregular heartbeat, and fainting may occur due to the onset of heart failure.
Diagnosing cardiomyopathy early is crucial, as early treatment can slow down the disease's progression and improve quality of life. Some people with cardiomyopathy never exhibit any signs or symptoms, especially in the early stages of the disease. However, heightened risk factors, such as a family history of cardiomyopathy, heart failure, or cardiac arrest, warrant screening.
The diagnosis of cardiomyopathy involves a comprehensive approach, including taking a detailed medical history, a physical examination, and various diagnostic tests. Here is a step-by-step overview of the cardiomyopathy diagnosis process:
- Medical History and Risk Factors: A healthcare provider will inquire about your medical history, including any symptoms you may be experiencing, such as shortness of breath, fatigue, or heart palpitations. They will also ask about your family history, specifically whether any family members have been diagnosed with cardiomyopathy or have experienced heart failure or sudden cardiac death.
- Physical Examination: The doctor will perform a physical exam, listening to your heart and lungs using a stethoscope. Particular sounds, such as murmurs or abnormal heart rhythms, may suggest cardiomyopathy or a specific type of the disease. They will also look for physical signs of heart failure, such as swelling in the ankles, feet, legs, abdomen, or neck veins, which could indicate fluid buildup.
- Diagnostic Tests: A range of tests may be recommended to confirm the diagnosis and assess the severity of cardiomyopathy:
- Blood Tests: Blood tests can help detect changes in the levels of certain substances in the blood that are indicative of cardiomyopathy or complications like heart failure.
- Chest X-ray: A chest X-ray provides images of the structures in your chest, helping to determine if your heart is enlarged or if there is fluid buildup in your lungs.
- Electrocardiogram (ECG or EKG): An ECG records your heart's electrical activity, revealing information about its rhythm and speed. It can detect changes associated with cardiomyopathy, heart attacks, arrhythmias, and heart failure.
- Holter and Event Monitors: These portable devices allow for continuous monitoring of your heart's electrical activity during daily activities, helping diagnose intermittent heart rhythm disturbances.
- Echocardiogram (Echo): This test uses sound waves to create a moving image of your heart, showing its size, shape, and function. It can also assess the "ejection fraction," which is often lower in people with cardiomyopathy.
- Stress Test: During a stress test, you will exercise or be given medication to increase your heart rate. This test evaluates how your heart functions under stress and can be combined with an ECG or echocardiogram to assess blood flow to the heart during exercise.
- Cardiac Catheterization: This procedure involves inserting a thin, flexible tube into a blood vessel and guiding it to your heart. It can be used for diagnosis and treatment, including heart biopsies to obtain a small piece of heart tissue for analysis.
- Coronary Angiography: This test uses contrast dye and X-ray images to detect blockages in the coronary arteries caused by plaque buildup.
- Genetic Testing: Genetic testing can identify inherited forms of cardiomyopathy, which is important for individuals with a family history of the disease or other heart conditions.
Specialist Referral: If cardiomyopathy is suspected, your healthcare provider will likely refer you to a cardiologist (heart specialist) for further evaluation and confirmation of the diagnosis. Cardiologists specialize in heart diseases and can provide tailored treatment plans.
It is important to note that the absence of symptoms does not rule out cardiomyopathy, and early diagnosis through screening and risk assessment is crucial for effective management of the condition.
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Cardiomyopathy treatments
Cardiomyopathy refers to a group of primary diseases that affect the heart muscle. It can be acquired or inherited. Cardiomyopathies are either confined to the heart or are part of a generalised systemic disorder, often leading to cardiovascular death or progressive heart failure-related disability. Cardiomyopathies are generally varied and different factors can cause them in adults and children.
Treatment options include:
- Medication: For instance, mavacamten can be prescribed to improve the quality of life and reduce symptoms for patients with obstructive hypertrophic cardiomyopathy.
- Procedures: Septal ablation shrinks the septum, the muscle dividing the heart's lower chambers.
- Devices: These include iatrogenic/implanted pacemakers for slow heart rates, defibrillators for those prone to fatal heart rhythms, ventricular assist devices (VADs) for severe heart failure, or catheter ablation for recurring dysrhythmias that cannot be eliminated by medication.
- Lifestyle changes: Doctors may suggest changes to better manage the condition, such as eating food with low fat and salt, staying at a healthy weight, and stopping alcohol use.
- Heart transplant: This is an option for patients with life-threatening symptoms or complications when no other treatments have worked.
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Frequently asked questions
Heart muscle dysfunction, or cardiomyopathy, is a group of primary diseases of the heart muscle that affect your heart's ability to pump blood efficiently.
Symptoms of heart muscle dysfunction include fatigue, shortness of breath, heart palpitations, swelling of the legs, and fainting. As the disease progresses, it can lead to heart failure, cardiac arrest, or cardiogenic shock.
Heart muscle dysfunction can be caused by genetic factors, other medical conditions, unhealthy lifestyle factors such as long-term alcohol or cocaine use, or extreme stress.
Treatment for heart muscle dysfunction includes medications, procedures, healthy lifestyle changes, implanted devices, and therapy to lower stress. While there is no cure, treatment can help manage symptoms and slow the progression of the disease.
