The golden four-minute first aid method includes cardiopulmonary resuscitation, which is generally found when a patient is in cardiac arrest, to immediately give cardiac compressions and artificial respiration. When CPR is performed, the first step is to perform chest compressions in the correct position, usually at the midpoint of the bilateral nipple line, with a depth of more than 5cm and no more than 6cm, and the frequency of compressions is 100-120 times/min, and two artificial respirations are given after 30 compressions. Artificial respiration. Because the brain is very sensitive to oxygen deprivation, generally 4-6 minutes, the patient’s brain cells will have irreversible damage and death, so the golden four minutes are very important.