Some heart disease patients suffer from severe organic heart disease such as acute myocardial infarction, which is prone to sudden cardiac arrest, resulting in the interruption of blood circulation throughout the body, respiratory arrest, loss of consciousness, and extremely rapid death. The sudden loss of consciousness that occurs within one hour after the onset of acute symptoms is characterized as a natural death caused by the heart, which is called sudden cardiac death. The resuscitation success rate for sudden cardiac death is only 5.6%. The heart is an important organ that ejects blood into the circulatory system to supply organs throughout the body. When sudden cardiac death occurs, blood ejection from the heart stops, there will be a sudden interruption of cerebral blood flow, loss of consciousness, and respiratory function of the lungs stops, and if it is not saved in time during the golden rescue time of 4~6 minutes, biological death will occur. About 80% of sudden cardiac deaths in Western countries are caused by coronary artery disease and its complications, and those with reduced left ventricular ejection fraction, frequent and complex ventricular preterm contractions after myocardial infarction are prone to sudden cardiac death.