1.What is myocarditis? A: Myocarditis is the direct infiltration of myocardial cells and their tissue spaces by pathogenic microorganisms such as bacteria, viruses, rickettsiae, helminths, and other pathogens as well as inflammatory cell infiltration that has as organism response to pathogens. Myocarditis can also be the result of myocardial cell damage caused by toxins, physicochemical factors or allergic reactions. 2.What causes can myocarditis be caused by? A: Myocarditis can not only originate in the myocardium, but can also occur when systemic diseases invade the myocardium simultaneously or sequentially. The causes of myocarditis are many and are divided into two main categories: infectious and non-infectious. The most common causes of myocarditis are viral infections, bacterial infections, fungal infections, rickettsial infections, helminth infections, protozoa, and helminth infections, with viral and bacterial infections being the most common. 3.What are the clinical features of viral myocarditis? A: The severity of viral myocarditis patients varies greatly, the lighter ones can be asymptomatic, the better ones can cause sudden death. Light lesions can only have mild discomfort, chest tightness, weakness, or even no feeling, serious cases can occur arrhythmia, or even sudden death. (2) More than half of the patients have a history of acute viral infection within 1-3 weeks before the onset of the disease, and after the primary infection such as fever, generalized aches and pains, sore throat, cough, diarrhea, etc., the patient develops palpitations, chest tightness and other cardiac symptoms that are sufficient to attract attention; (3) cardiac involvement, the patient has chest tightness, chest pain , palpitations, shortness of breath, and discomfort in the precordial region. On examination, the physician may find enlargement, bradycardia, or tachycardia out of proportion to body temperature. (4) Extracardiac manifestations, when the virus also invades other organs, it can produce corresponding clinical signs, such as hepatitis, meningitis and poliomyelitis, etc. 4.What is cardiomyopathy? A: Cardiomyopathy refers to a group of diseases caused by myocardial hypertrophy, cavity expansion and myocardial fibrosis changes mainly due to myocardial lesions themselves. Of course, it does not include the common rheumatic, coronary arteriosclerosis, hypertensive, pulmonary and congenital heart disease associated with myocardial lesions. 5.What is hypertrophic cardiomyopathy? A: Hypertrophic cardiomyopathy is another type of primary cardiomyopathy. Significant hypertrophy of the myocardium without enlargement of the ventricular cavity is the characteristic pathological change of the disease. 6, hypertrophic cardiomyopathy is divided into which categories? A: Clinically, it is divided into hypertrophic non-obstructive cardiomyopathy and hypertrophic obstructive cardiomyopathy (idiopathic hypertrophic subaortic stenosis). The most common symptoms in patients are dyspnea and angina, and weakness and syncope are extremely rare; advanced patients may develop heart failure and arrhythmias, usually without murmurs.