Intravenous injection of large amounts of air can lead to air embolism, causing pulmonary embolism and pulmonary edema, which can be life-threatening in severe cases. If a small amount of air is injected into the vein, it is generally not harmful and only requires the patient to be in a semi-recumbent position, oxygenated, and monitored for changes in vital signs, such as heart rate, blood pressure, pulse, oxygen saturation and other changes. At the same time, pay attention to observe the patient’s general condition, there is no nausea, vomiting, dizziness and other symptoms. Usually observe the patient for about 15 minutes, if the patient does not have the above symptoms, there is nothing wrong, because a small amount of air into the bloodstream can be eliminated from the body through the circulation of the lungs.