If a small amount of air enters the blood vessels during the drip, there is usually no big problem, now the infusion set has automatic exhaust device, do not worry too much about gas such as. You can take a semi-recumbent position, then oxygen, cardiac monitoring, to understand the changes in vital signs. If there is no heartburn, chest tightness, nausea, vomiting and other reactions, it is fine to observe for a few minutes or ten minutes. If there is more gas entering the blood vessels, more than 100 ml before it may cause organic lesions, including gas embolism, pulmonary embolism and other conditions. If it is under 100 ml of air into the blood vessels, the condition also needs to be closely observed. During the observation process, the patient’s heart rate, blood pressure, pulse rate and oxygen saturation should be monitored at all times, and in case of any problems, it is necessary to come to timely resuscitation. Generally speaking, the duration of observation should be appropriately long because air needs to be exchanged in the alveoli and then expelled to the body through pulmonary respiration.