Tachycardia consisting of more than 3-5 broad aberrant QRS waves originating below the bifurcation of the bundle of Hirschsprung is called ventricular tachycardia and can be caused by cardiac surgery, cardiac catheterization, severe myocarditis, congenital heart disease, infection, hypoxia, and electrolyte disturbances. However, in many cases, the cause is not easy to determine, so how to prevent it? The following will give you a lecture: prevention of qrs wave widening malformation Ventricular tachycardia is a serious rapid arrhythmia, which can develop into ventricular fibrillation and lead to sudden cardiac death. The death rate can be more than 50% in those with heart disease, so it must be diagnosed in time and treated appropriately. Lidocaine 0.5-1.0mg/kg can be used as a drug by intravenous drip or slow push. This drug can control tachycardia, but the duration of action is very short, too large a dose can cause convulsions, conduction block and other toxic reactions. In patients with decreased blood pressure or heart failure, synchronous DC resuscitation is preferred, followed by maintenance with lidocaine after conversion. For polymorphic ventricular tachycardia with Q-T interval prolongation only, if the factor is congenital, β-blockers are preferred and class Ia, Ic and III drugs and isoproterenol are contraindicated. In the case of acquired factors, isoproterenol may be used and lidocaine may be tried if necessary. Most importantly, ventricular tachycardia is a very serious arrhythmia and must be prevented. Efforts should be made to find and treat reversible pathologies that trigger and maintain ventricular tachycardia, such as ischemia, hypotension, and hypokalemia. Treatment of heart failure can help reduce the number of ventricular tachycardia episodes. In sinus bradycardia or atrioventricular block, the ventricular rate is slow and ventricular tachycardia is likely to occur, which can be treated with atropine or artificial pacing.