Sudden death is the most serious challenge facing clinical medicine, and sudden cardiac shock death syndrome is a type of sudden death that has been gradually recognized and its incidence and diagnosis have been increasing in recent years. Unlike other types of sudden death, it mainly affects healthy adolescents, and there are few survivors after the onset of the disease, so it is of great clinical significance to discuss sudden cardiac shock death syndrome. Definition of sudden cardiac death syndrome Sudden cardiac death syndrome refers to the sudden death of healthy adolescents caused by the impact of a baseball or other impacting object on the precordial region of the chest with relatively low energy during sports [1]. Classification Sudden cardiac death syndrome is divided into: primary ventricular fibrillation: i.e., ventricular fibrillation occurs directly after the chest is struck, and loss of consciousness and cardiac arrest occurs at the same time as the chest is struck, which accounts for about 60% of cases. Secondary ventricular fibrillation: the arrhythmia directly triggered by the chest impact is not ventricular fibrillation, but ventricular tachycardia or ventricular spontaneous rhythm, which is then transformed into ventricular fibrillation. The reason why young people are prone to sudden cardiac death syndrome is that they are still developing and their thorax is more elastic, which makes it easy for the energy generated by external impacts to be transmitted to the heart, inducing electrical instability of the heart and ventricular fibrillation. 4.Diagnosis There is a clear history of impact blunt force trauma to the precordial region. The blunt trauma should be impactful, i.e., have considerable velocity. Syncope and loss of consciousness collapse immediately after injury to the precordial region, and death occurs within a very short period of time after the injury. There must be eyewitnesses at the scene to confirm the above injuries and death. A comprehensive and systematic autopsy confirms that there is no lethal injury or lesion to the heart or other organs. Pathogenesis Timely stimulation often triggers electrical instability. For example, if the energy generated by a chest impact falls on the top of the T wave of the cardiac repolarization in the first 15-30ms of the fibrillation period, ventricular fibrillation can occur immediately. In addition, the impact on the chest can also cause ventricular pre-systole, ventricular pre-systole falls in the fibrillation period of the heart, i.e., the RonT phenomenon, which may also break the original electrical stability of the heart, resulting in the emergence of fatal ventricular fibrillation. Treatment Timely defibrillation and cardiopulmonary resuscitation (CPR) are the only way for patients to survive. Regardless of the type of arrhythmia, “blind defibrillation” should be performed when there is no way to distinguish between the two, such as pounding the anterior region of the heart with the fist, or rhythmic pressure on the heart area, while artificial respiration is performed. Application of training balls with soft texture; wearing of chest protection clothing during exercise; training of relevant personnel in CPR and defibrillation techniques.