The three steps of cardiopulmonary resuscitation are artificial chest compression, airway opening and artificial respiration, among which artificial chest compression is the most important.

1. Artificial chest compressions: When performing artificial chest compressions, the patient should lie on his back on a hard surface, and the rescuer should kneel beside him. The rescuer should lean forward so that the shoulders, elbows and wrists are on the same axis and perpendicular to the patient's body plane, and press the lower part of the sternum at the midpoint of the connecting line between the two nipples.

Let the chest rebound completely after each press. When relaxing, don't leave the chest wall with your hands and elbows, and apply force vertically downward by the gravity of the upper body. The pressing frequency range is 100- 120 times/minute, and the adult range is at least 5-6cm. The time for pressing and relaxing needs to be roughly equal.

2. Open the airway: An important step in successful recovery is to keep the airway unobstructed. The foreign body and vomit in the patient's mouth should be removed, and if the denture is loose, it should also be removed. If there is no neck trauma, you can open the airway by lifting your forehead. The rescuer presses the patient's forehead with one hand to make it lean backwards, and raises the mandible with the other hand to make the connecting line between the mandibular tip and the earlobe perpendicular to the ground, so as to clear the airway.

3. Artificial respiration: After artificial respiration opens the airway, perform artificial respiration twice, blowing continuously for more than 1 s each time to make the chest fluctuate, and then press the chest immediately.

Cardiopulmonary resuscitation should receive professional training, follow correct operation methods and avoid complications as much as possible.

Cardiac arrest (heart? Cardiac arrest (CA) refers to the sudden stop of the heart in unexpected situations and times due to various reasons, which leads to the sudden suspension of effective heart pumping function and effective circulation, causing severe ischemia, hypoxia and metabolic disorder of tissues and cells in the whole body. If not rescued in time, life can be lost immediately. Cardiac arrest is different from cardiac arrest at the end of any chronic disease. If correct and effective resuscitation measures are taken in time, patients may be saved and recovered.

Once cardiac arrest occurs, if it is not rescued and resuscitated immediately, it will cause irreversible damage to the patient's brain and other important organs and tissues after 4 ~ 6 minutes. Therefore, cardiopulmonary resuscitation (CPR) after cardiac arrest must be performed at the scene immediately to win the most precious time for further rescue until the life of the patient with cardiac arrest is saved.