The suitability of a defibrillator for dilated cardiomyopathy heart failure needs to be determined on a patient-by-patient basis, and defibrillators are suitable for those with severe arrhythmias. Dilated cardiomyopathy accompanied by heart failure is not an indication for the installation of a defibrillator. This is because defibrillators are used to treat malignant arrhythmias and restore sinus rhythm, not to treat heart failure. Defibrillators are used to eliminate severe arrhythmias and restore sinus rhythm by applying electric shocks to the heart through pulsed electrical currents, which is a common method for clinical emergencies and is highly efficacious, fast-acting, easy to operate, and relatively safe. Heart failure patients need to actively use drugs to treat the primary disease, at the same time to pay attention to cardiotonic, diuretic, vasodilator, to maintain the basic function of the heart. Heart failure patients do not need to install defibrillators if they do not have malignant arrhythmias. This is because installing a defibrillator is an invasive procedure and is expensive. If a heart failure patient has a recent and persistent malignant arrhythmia, such as ventricular tachycardia, ventricular fibrillation, etc., and is at risk of sudden cardiac arrest, then a defibrillator should be considered. This varies from person to person and requires a hospital visit for examination and consultation with a specialist.