Recently, a 3-month-old boy came to the hospital with a cough, no fever, and a good appetite, so he was given some medication. On the 8th day, there was a sudden change in his condition, and he was admitted to the hospital for resuscitation with poor respiratory circulation. Ultrasound examination revealed extreme enlargement of the left ventricle and very poor ejection of blood from the heart, and he died a few hours later. The cause of death was considered to be fulminant myocarditis. Violent myocarditis, a hidden fatal killer. In the face of sudden death, family members often find it difficult to understand: they were fine before, why did they say no? Think the doctor is a misdiagnosis led to disputes. Take a look at the following example: Sudden cardiomyopathy, which often favors children in good health, is an acute severe illness in children, usually originating from a mild upper respiratory tract infection or viral intestinal disease, mainly caused by enteroviruses such as coxsackie, echovirus, cytomegalovirus, as well as influenza viruses. Mild viral myocarditis usually presents with arrhythmia and usually resolves in 1-2 weeks. However, fulminant myocarditis is aggressive and lacks specificity in early symptoms, with a mortality rate of up to 80%. Dyspnea, breath-holding, shortness of breath, fatigue, chest tightness, chest pain, diarrhea, vomiting, and may be in a state of low blood pressure, or even fainting, shock, or even sudden death can occur. Violent myocarditis is usually caused by viral infections, one is the direct action of the virus on the myocardium, resulting in myocarditis; the second is the immune response, the child infected with the virus in the process of autoimmunity, the immune system to the body’s normal cells to attack, resulting in damage to the myocardium. The onset of acute severe myocarditis and physical fitness is not necessarily linked, the stronger the resistance, the more likely the body to produce a strong immune perversion. A variety of myocardial damage, arrhythmias, cardiac dysfunction, and large myocardial necrosis leading to pump failure can occur. The virus violates the cardiac conduction system, which can lead to severe arrhythmias, even ventricular fibrillation, and eventually sudden death. The virus can also invade the coronary arteries, which can cause acute thrombosis and lead to acute myocardial infarction. Decreased heart function can cause systemic organ failure. Is there a “golden hour” for treatment? Due to the complexity of acute myocarditis, in the process of treatment, the patient may be due to pump failure caused by multiple organ failure, resulting in sudden death, so it is difficult to say the specific “golden time”. Resuscitation needs to have extracorporeal life support system equipment, temporary pacemakers, intra-aortic balloon counterpulsation, and even left ventricular assist devices and other medical equipment in the process of rescue “essential”.