How many hours after the infusion of fluids into the air can eliminate the danger depends mainly on the amount of air. Infusion of air may trigger a severe air embolism in which the patient will present with chest discomfort or retrosternal pain, followed by dyspnea and a sense of near death. If less than 1 ml of air enters the blood vessel during infusion, there is usually no significant effect. If the amount of air that enters the blood vessel during infusion is 1-5 ml, the patient’s blood pressure, heart rate, pulse rate, and oxygen saturation need to be strictly monitored for at least 4-8 hours to rule out the danger. If the amount of air entering the blood vessels during infusion reaches 5-20 ml, the patient should be immediately given certain therapeutic measures, take his left side lying position, and immediately administer oxygen to avoid too rapid a drop in oxygen saturation, as well as warmth and so on. Therefore, it is recommended that the patient should be accompanied by a family member during the infusion, and the infusion tube should be observed at any time to see if there is any abnormality, which will help prevent air from entering the infusion tube.