What is myocarditis?

Myocarditis is an inflammation of the heart muscle that can damage the heart muscle cells and affect the heart's ability to pump blood. Inflammation can be caused by a variety of factors, including viruses, bacteria, toxins, and autoimmune reactions. Myocarditis can be acute (short-term) or chronic (long-lasting) and can range in severity from mild to life-threatening.

How does myocarditis affect the body?

When the heart muscle is sore, it can:

• Decrease the pumping capacity of the heart: inflammation damages heart muscle cells (cardiomyocytes), which reduce the strength and efficiency of contraction.
• Cause heart rhythm disturbances (arrhythmias): damaged heart muscle can interfere with the electrical signals that regulate the heartbeat, causing arrhythmias.
• Contribute to heart failure: prolonged inflammation can lead to chronic heart failure, where the heart is unable to meet the body's needs for oxygen and nutrients.
• Increase the risk of blood clots: inflammation can contribute to the formation of blood clots in the heart, which can migrate to other parts of the body, causing a stroke or heart attack.
• Cause sudden cardiac death: in severe cases, myocarditis can lead to cardiac arrest.

Causes of myocarditis

Myocarditis can be caused by a variety of factors, and often the exact cause remains unknown. However, in most cases it is caused by infections, especially viral infections.

Infections

Viral infections

Viruses are the most common cause of myocarditis. They can directly infect heart muscle cells or trigger an immune response that damages the heart.

• Coxsackie virus B: one of the most common causes of myocarditis, especially in children and young people.
• Adenovirus: causes upper respiratory infections and can affect the heart.
• Parvovirus B19: causes fifth disease in children and can damage the heart.
• Cytomegalovirus (CMV): a member of the herpes virus family that can cause myocarditis in immunocompromised patients.
• Epstein-Barr virus (EBV): causes mononucleosis and can affect the heart.
• Hepatitis C virus: associated with chronic myocarditis.
• The COVID-19 virus (SARS-CoV-2): There have been reports of cases of myocarditis associated with COVID-19 infection or vaccination.

Bacterial infections

Bacteria can cause myocarditis through direct infection or release of toxins.

• Streptococci and staphylococci: may cause endocarditis that may spread to the myocardium.
• Borrelia burgdorferi: the causative agent of Lyme disease, which can damage the heart.
• Corynebacterium diphtheriae: causes diphtheria, whose toxins can damage the heart.
• Chlamydia pneumoniae: can cause respiratory infections and inflammation of the heart.

Fungal infections

Less common, but may affect patients with a weakened immune system.

• Candida species: can cause inflammation of the heart in immunosuppressed patients.
• Aspergillus species: associated with myocarditis in patients with chronic lung disease.

Parasitic infections

• Trypanosoma cruzi: causes Chagas disease in Latin America, which can cause chronic myocarditis.
• Toxoplasma gondii: may cause myocarditis in immunocompromised patients.

Autoimmune diseases

The immune system can mistakenly attack heart muscle cells, causing inflammation.

• Systemic lupus erythematosus: an autoimmune disease that can affect the heart.
• Rheumatoid arthritis: can cause inflammation of the heart.
• Vasculitis: inflammation of the blood vessels, which can damage the heart vessels and myocardium.

Other diseases and factors

• Radiation therapy in the chest area: can damage heart tissue.
• Systemic infections: sepsis can cause myocarditis.

Symptoms that cannot be ignored

The symptoms of myocarditis can be varied and often resemble the symptoms of other diseases, such as a heart attack or the flu. Some people may have no symptoms, while others may have severe symptoms.

Most common symptoms

Chest pain:

• Severe, pressing or burning pain.
• May radiate to the neck, shoulder or arm.
• It can resemble the pain of a heart attack.

Shortness of breath:

• During exercise or at rest.
• Difficulty sleeping while lying down (orthopnoea).
• Shortness of breath at night (paroxysmal nocturnal dyspnoea).

Fatigue and weakness:

• Reduced stamina and energy.
• Difficulty performing daily activities.

Palpitations:

• Fast (tachycardia) or irregular heartbeat.
• A feeling that the heart "skips" beats.

Fever and flu-like symptoms:

• Fever, muscle pain, headache, joint pain.
• Cough, sore throat.

Swelling:

• Swelling of the legs, ankles or feet (peripheral oedema).
• Abdominal bloating (ascites).

Dizziness or fainting:

• due to heart rhythm disorders or reduced cardiac output.

Rashes or skin changes:

• May be associated with an infection or autoimmune process.

For children and babies

• Eating disorders: loss of appetite, poor eating.
• Difficulty breathing: fast or labored breathing.
• Pale or gray skin: due to insufficient blood circulation.
• Irritability and restlessness: crying, sleep disorders.
• Lack of weight gain: growth retardation.

When to seek medical help

If you or someone else experiences any of the following symptoms, seek immediate medical attention:

• Sudden, severe chest pain.
• Shortness of breath that worsens rapidly.
• Irregular heartbeat or palpitations.
• Fainting or loss of consciousness.
• Severe fatigue or weakness that is unexplained.
• For children: if the above symptoms occur, especially breathing difficulties or poor eating.

Diagnostics

Diagnosing myocarditis can be challenging because symptoms often overlap with other heart conditions, such as heart attack, cardiomyopathy, or pericarditis. Accurate diagnosis is essential to start appropriate treatment and prevent complications.

Medical history and physical examination

Medical history:

• Symptoms and their duration.
• Recent infections (viral, bacterial), vaccinations, travel.
• Family history of heart disease or sudden cardiac death.

Physical examination:

• Cardiac auscultation: Noises, heart rate and rhythm.
• Measuring blood pressure and pulse.
• Examination for edema, skin color, respiratory rate.

Diagnostic tests

Electrocardiogram (ECG): assesses the electrical activity of the heart.

• May reveal:

  • Arrhythmias (tachycardia, bradycardia).
  • ST segment and T wave changes indicating inflammation or ischemia.
  • Heart blocks.

Chest X-ray

• Determines the size and shape of the heart.
• Detects fluid accumulation in the lungs or around the heart (pericardial effusion).

Echocardiography: an ultrasound exam that evaluates the structure and function of the heart.

• Nosaka:

  • The dimensions and thickness of the walls of the chambers of the heart.
  • Heart pumping capacity (ejection fraction).
  • Valve operation.
  • Pericardial effusion.

Blood tests

• Cardiac enzymes (troponin, CK-MB): elevated levels indicate heart muscle damage.
• C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR):

Markers of inflammation:

• Leukocyte count: elevated in inflammation or infection.
• Viral Antibodies and PCR Tests: identify potential infectious agents.
• Autoantibodies: indicates an autoimmune process.

MRI (magnetic resonance imaging): provides detailed images of the heart.

• Can show:

  • Signs of inflammation.
  • Scar tissue formation.
  • Swelling of the heart tissue (edema).

Heart biopsy:

• Analysis of small samples of heart tissue using a catheter through a vein or artery.
• Confirms the diagnosis of myocarditis and identifies the cause (for example, the presence of viruses).
• Risk: an invasive procedure with potential complications.

Cardiac Catheterization:

• Used to measure blood flow, pressure in the heart and blood vessels.
• Helps rule out coronary artery disease.

Treatment options

Treatment of myocarditis depends on the cause, the severity of symptoms and the presence of complications. The goal is to reduce inflammation, improve heart function, and prevent complications.

Supportive therapy

• Recreation: restriction of physical activities, to reduce the load on the heart and promote recovery.
• Hospital follow-up: severe cases require hospitalization to monitor cardiac function, rhythm, and hemodynamic status.
• Oxygen therapy: if you have breathing difficulties or low blood oxygen levels.

Medical devices and procedures

Heart rhythm devices

• Pacemakers: if you have a slow heart rate (bradycardia) or heart block.
• Implantable cardioverter-defibrillators (ICDs): prevents life-threatening arrhythmias by delivering an electrical impulse.

Mechanical heart support devices

• Intra-aortic balloon counterpulse: phelps the heart pump blood, reducing the load.
• Ventricular Assist Devices (VAD): mechanical pumps that replace the function of the heart in severe cases.

Heart transplantation

• Indications: if other treatments are not effective and the heart damage is irreversible.
• Postoperative care: immunosuppressive therapy, regular monitoring.

How to live with myocarditis?

Recovery period

• Restriction of rest and physical activity: avoid heavy physical activity until complete recovery, as determined by the doctor.
• Regular doctor visits: monitor heart function, perform necessary examinations.
• Symptom monitoring: pay attention to any changes in health status, report to the doctor.

Lifestyle changes

Healthy diet:

• Rich in fruits, vegetables, whole grain products, lean meat, fish.
• Reduce salt intake to prevent fluid retention.

Smoking cessation:

• Improves cardiovascular health, reduces the risk of complications.

Limiting alcohol consumption:

• May worsen the condition of the heart, especially in alcoholic cardiomyopathy.

Stress controls:

• Meditation, yoga, breathing exercises, psychological counseling.

Regular, moderate physical activity:

• With doctor's approval to improve heart health and endurance.

Psychological support

• Emotional support: involvement of family and friends, sharing of feelings and experiences.
• Support groups: meeting other patients facing similar problems.
• Consultations with a psychologist: symptoms of depression, anxiety or stress.

Returning to everyday life

• Work and study activities: according to the doctor's recommendations, a gradual return to daily activities.
• Sex and Intimacy: consult a doctor about safe ways and when to return to intimate relationships.

Prevention

Although it is not always possible to prevent myocarditis, there are ways to reduce the risk and promote heart health.

Infection prevention

• Observance of hygiene: washing hands thoroughly with soap and water, especially after using the toilet and before eating.
• Vaccination: against flu, COVID-19, measles, mumps and other infections.
• Avoiding contact with sick people: reduces the risk of viral and bacterial infections.
• Safe sexual behavior: using condoms to prevent sexually transmitted infections.

Healthy lifestyle

• Strengthening the immune system: healthy diet, sufficient sleep, regular physical activity.
• Restriction of smoking and alcohol consumption: quit smoking, limit alcohol consumption.
• Stress controls: reduce chronic stress, which can weaken the immune system.

Regular medical check-ups

• Early detection and treatment of diseases: to monitor the state of health, especially if there are chronic diseases.
• Monitoring heart health: especially if there are risk factors or a family history.

Complications

Myocarditis can cause several serious complications, especially if it is not diagnosed and treated in time.

Heart failure

• Definition: the heart is unable to pump blood efficiently, causing insufficient oxygen supply to organs and tissues.
• Symptoms: shortness of breath, fatigue, edema, palpitations.

Heart rhythm disorders (arrhythmias)

• Definition: irregular heartbeat, which can be life-threatening.
• Symptoms: dizziness, fainting, palpitations, shortness of breath.

Sudden cardiac death

• Occurs due to severe cardiac arrhythmia or cardiac arrest.
• Prevention: early diagnosis and treatment, ICD implantation in risk patients.

Dilated cardiomyopathy

• The chambers of the heart expand and the walls become thinner, reducing the pumping capacity of the heart.
• There may be long-term effects of myocarditis.

Blood clot formation

• Blood clots can form in the heart and migrate to other parts of the body.
• Risk: stroke, pulmonary embolism, peripheral arterial embolism.
• Prevention: use of anticoagulants according to the doctor's instructions.

When to seek repeated medical attention

• Worsening of symptoms: chest pain, shortness of breath, palpitations.
• New symptoms: dizziness, fainting, swelling, weight gain due to fluid retention.
• Psychological difficulties: depression, anxiety, sleep disorders.

Conclusion

Myocarditis is a serious condition that can significantly affect heart health and quality of life. However, with early diagnosis and appropriate treatment, many people can make a full recovery or successfully manage their symptoms. It is important to seek medical help in time, follow the doctor's instructions and make the necessary lifestyle changes.