A small amount of air entering the blood vessels during infusion will not have a major effect, but if a large amount of gas enters the blood vessels it may cause a gas embolism. If a small amount of gas enters the blood vessel during intravenous infusion, the gas will dissolve quickly within a short period of time and will not have a significant effect on the human body. If a large amount of gas enters in a short period of time, gas bubbles will be formed when the gas enters the heart under the action of cardiac contraction, and gas bubbles entering the arterial system can lead to arterial embolism, cerebral embolism can lead to paralysis of a limb, coronary artery embolism can lead to the symptom of chest pain, and the condition of serious or even life-threatening. Try to prevent gas from entering the bloodstream during intravenous infusion to prevent gas embolism. If there is a large amount of air it is recommended to call a healthcare professional promptly.