Myocardial damage of unknown etiology, the most important manifestations of which are cardiomegaly and progressive heart failure

myocardial damage associated with inflammation caused by the direct effect of infection or its indirect effect through preliminary sensitization or autoimmunization

Non-coronarogenic, non-inflammatory myocardial damage, which is based on a violation of myocardial metabolism associated with the action of established exo- or endogenous factors