What causes viral myocarditis

Viral myocarditis is a chronic inflammatory disease, which is also an infectious myocardial disease. The treatment of viral myocarditis is very important. Many people want to know what causes viral myocarditis. Generally, viral myocarditis is mainly caused by viral infection.

1. About 40% of cases are caused by Coxsackie virus infection. Other viruses include: ECHO, polio, adenovirus 40, 41, influenza, parainfluenza virus, measles, mumps, Japanese encephalitis, hepatitis virus, herpes zoster virus, cytomegalovirus, HIV, infectious mononucleosis, etc.

2. The virus acts on the myocardium by directly invading the myocardium and damaging the small blood vessels within the myocardium. Myocardial damage caused by immune mechanisms plays an important role in the pathogenesis of myocarditis. Direct viral invasion and immune response mediation lead to myocardial cell damage and cardiac systolic and diastolic dysfunction; if the lesions involve the sinoatrial node, atrioventricular node, bundle branch and other pacing or conduction systems, various types of arrhythmias can be induced. In addition, this disease may also be related to selenium deficiency and abnormal expression of HLA antigens. About 10% of myocarditis caused by coxsackie B virus infection eventually develops into dilated cardiomyopathy.

3. Viral myocarditis is caused by a variety of viruses, and Coxsackie virus is an important pathogen of this disease. Influenza virus, mumps virus, enterovirus and polio virus can all cause myocarditis. Moreover, this disease is also related to smoking, drinking, malnutrition, fatigue, trauma and contact with toxic substances. Most viral myocarditis patients have cold symptoms before the onset of the disease. Therefore, it is often mistaken for a cold and delays the diagnosis and treatment of myocarditis.