Cardiomyopathy can be cured when the arrhythmia is eradicated in patients with arrhythmogenic cardiomyopathy. Other cardiomyopathies, such as hypertrophic cardiomyopathy, dilated cardiomyopathy, and congestive cardiomyopathy cannot be eradicated. Long-term tachyarrhythmias and atrial fibrillation, which lead to a large heart and heart failure, may be cured when atrial fibrillation is resolved. If there is atrial tachycardia, resulting in a large heart and heart failure, the atrial tachycardia can be eradicated by radiofrequency ablation, and the heart can become smaller. In some patients, frequent ventricular tachycardia and premature ventricular tachycardia can affect the heart function for a long time, resulting in arrhythmia and cardiomyopathy. If the heart is still large even after the arrhythmia has been treated, the cardiomyopathy may have little to do with the arrhythmia. Cardiomyopathy caused by arrhythmia and arrhythmia produced by cardiomyopathy are often indistinguishable. If the patient’s condition is favorable and physical condition is good, the arrhythmia will be cured through interventional therapy, the heart will become smaller and smaller, and the ejection function will be restored, and this kind of arrhythmogenic cardiomyopathy can be cured.