Lidocaine is a local anesthetic drug that can be used to combat arrhythmias. It is a derivative of cocaine, but has no hallucinogenic or addictive components compared to cocaine, so it is still widely used clinically. In the treatment of arrhythmias, it was mainly used to prevent and treat acute infarction, resulting in rapid ventricular arrhythmias, or ventricular premature beats, ventricular tachycardia, or ventricular fibrillation in acute myocardial infarction, but it is usually ineffective in supraventricular arrhythmias. But it is still widely used as a local anesthetic drug, because the local anesthetic effect is relatively strong and long-lasting, and good surface penetration, so it is a very good local anesthetic agent, generally applied 1-3 minutes to take effect, the effect can be maintained for 1-3 hours.