Intravenous anesthesia requires the injection of anesthetic drugs into the blood vessels, which act on the central nervous system by way of blood circulation, thus exerting the effect of general anesthesia. However, there are strict requirements on the amount and speed of drug administration. Some anesthetic drugs, such as lidocaine, have anti-arrhythmic effects after injection, and are generally used for local infiltration injection or topical application, and injection into blood vessels is likely to cause adverse reactions, such as bradycardia or patients with severe atrioventricular block, the application of this drug can worsen the condition. However, some anesthetic drugs, such as procaine commonly used in local infiltration anesthesia, etc., injected into the vein, if the amount is higher, may induce arrhythmia. If anesthetic drugs unsuitable for intravenous injection are injected into the blood vessels, adverse reactions such as agitation, nausea and vomiting, babbling, hypoxia, convulsions, drop in blood pressure, drop in body temperature, and weak pulse may occur. Clinically, in order to prevent too much anesthetic from being injected into the blood vessels, the anesthesia will be carefully operated, the dosage and the speed of drug administration will be strictly controlled, and the vital signs will be closely monitored during the anesthesia process. If anesthetics that cannot be injected intravenously are mistakenly injected into blood vessels, the injection of the drugs should be stopped immediately, and timely treatment should be carried out to avoid delaying the condition, in order to prevent the toxic reaction from worsening, which may lead to danger.