Air embolism is a disease caused by an embolus of gas originating in the lungs that obstructs a cerebral blood vessel, usually due to overinflation of the lungs caused by expanding lung gas during a decrease in peripheral pressure (e.g., when rising from deep water to shallow water), and is commonly characterized by pain and/or neurological symptoms. Air embolism is the entry of air into the blood circulation to the lungs, blocking the main pulmonary artery pathway and causing severe shock. It is extremely rare and in the field of obstetrics and gynecology can arise during delivery or after delivery (including miscarriage). ECG The ECG changes of acute pulmonary heart disease may occur, including the presence of pulmonary P waves, right bundle branch block, right heart strain, and other signs. 2.Central venous pressure measurement and air aspiration The central venous pressure is increased in the case of air embolism, and air may be aspirated, which is of diagnostic significance. In the case of right ventricular cavity puncture, the blood drawn from the heart is foamy. It is important to note that cardiac cavity puncture must be performed carefully and is generally not recommended, but can be used in resuscitation of cardiac arrest.