Viral myocarditis is a non-specific interstitial inflammation of the myocardium caused by human infection with a cardiophilic virus. It can be limited or diffuse; the course of the disease can be acute, subacute or chronic. Most patients with acute viral myocarditis recover completely and sudden death rarely occurs; some chronically developing viral myocarditis can evolve into cardiomyopathy. Some patients are left with sequelae manifesting after significant myocardial scar formation: some degree of cardiac enlargement, cardiac decompensation, arrhythmias, or persistent ECG abnormalities.
Various viruses can cause myocarditis, among which the most common are the member long viral infections that cause intestinal and upper respiratory tract infections. The enterovirus is a tiny ribonucleic acid virus, of which coxsackie, ECHO (ECHO), poliovirus is the main virus causing myocarditis; mucovirus such as influenza, parainfluenza, respiratory syncytial virus caused by myocarditis is also not uncommon; adenovirus also sometimes cause myocarditis. In addition, measles, mumps, encephalitis B, hepatitis, cytomegalovirus, etc. can also cause myocarditis.