The golden time for cardiopulmonary resuscitation after sudden death is generally within 4 minutes, also known as the golden 4 minutes. The limit of neurological tolerance to hypoxia is approximately only 4 minutes, and exceeding this time may lead to irreversible damage occurring. Sudden death is generally referred to as cardiac and respiratory arrest. Cardiac and respiratory arrest refers to the sudden termination of the ejection function of the heart, the disappearance of the aortic pulsation and heart sounds, and the severe ischemia and hypoxia of important organs, such as the heart and brain, which eventually leads to the termination of life, and is medically referred to as sudden death. There are many causes of cardiac and respiratory arrest, such as cardiovascular diseases, long-term fatigue, staying up late, long-term anxiety of the heart, congenital heart disease, etc., which can cause respiratory and cardiac arrest. It is found that some patients will not have any discomfort symptoms before cardiac arrest, and some patients will have chest tightness and panic before cardiac arrest. If patients have panic and chest tightness from time to time, which are not related to anxiety, sleep or tension, they need to visit a hospital to check for cardiovascular and cerebrovascular abnormalities.