The ratio of chest compressions and artificial respiration during CPR is 30:2, that is, 30 chest compressions followed by 2 mouth-to-mouth artificial respirations. When performing chest compressions, it is necessary to master the appropriate compression amplitude and compression frequency, with the compression amplitude reaching a depth of 5-6 cm as the appropriate level and the compression frequency being 100-120 times/minute. When performing mouth-to-mouth artificial respiration, the patient’s chest should be observed to rise and fall, and the blowing should not be too large to avoid blowing the gas into the patient’s abdomen. During CPR, 30 chest compressions and 2 artificial respirations are performed for 1 cycle, and after 5 cycles, the patient’s vital signs should be checked for the second time, and if the patient’s breathing and heartbeat are found to be restored, the patient should be placed in a recovery position and wait for further rescue.