Patient: How is CARTO used in your hospital and how successful is your hospital in performing this type of procedure? Specialist from Shanghai Xinhua Hospital: Compared to two-dimensional systems such as X-ray and intracavitary ECG, CARTO can provide more anatomical and electrocardiographic information to cardiac electrophysiologists, and is now widely used for catheter ablation of arrhythmias such as atrial fibrillation. Especially for some difficult arrhythmias, the CARTO system is more advantageous, such as ventricular tachycardia after myocardial infarction, ventricular tachycardia/atrial tachycardia after surgery, ventricular tachycardia in cardiomyopathy, atypical atrial flutter, and polymorphic ventricular tachycardia. CRRTO is based on the Winbows system, which has a friendly interface and is easy to learn and operate. The application of CARTO system helps to deepen the understanding of the electrophysiological mechanism of complex arrhythmias. It can improve the success rate of ablation and reduce X-ray exposure, etc.