TOPICS: Myocardial tissue layer, infectious, non-infectious, coxsackie B, chagas disease, Trypanosoma cruzi, viruses, bacteria, fungi, parasites, rheumatic fever, autoimmune, SLE, Kawasaki disease, arsenic, carbon monoxide, cocaine, giant cell myocarditis, sarcoidosis, dilated cardiomyopathy, heart failure, arrhythmias, myofibrillary necrosis, mononuclear cell infiltrates, granulomas, parasites, dyspnea, chest pain, fever, arrhythmia, persistent tachycardia, fever, prodromal viral illness, sudden cardiac death, supportive, exercise restriction