Affecting several thousand Americans each year, myocarditis is a disease marked by inflammation of the heart muscle (myocardium). The real numbers are hard to know because myocarditis often produces no symptoms.
A wide range of infections and other problems can lead to myocarditis, which often develops in people who are otherwise healthy. Prevention or prompt treatment of infections is one of the best ways to prevent myocarditis.
Mild supraventricular tachycardia,
with short episodes that don't happen often, doesn't typically weaken the heart or lead to heart failure. But some people have a higher risk of getting heart failure, such as those who have a heart valve disease. If tachycardia is left untreated,
repeated and long episodes of tachycardia can lead to
heart failure (known
as a tachycardia-mediated cardiomyopathy). But this heart failure might be stopped, or reversed, if the supraventricular tachycardia is stopped with treatment.