In general, conventional catheter ablation is only indicated for arrhythmias with a single focal point and is not indicated for arrhythmias of multiple origin. Catheter ablation is performed in a catheterization laboratory equipped with special electrophysiological examination and catheter ablation equipment. The purpose of the electrophysiological examination is to diagnose and localize the arrhythmia lesion, and the ablation treatment is performed after the location of the lesion has been determined, which is a 2-part procedure. The patient lies flat on the operating table and is conscious in most cases, with a moderate amount of sedation given in a few cases for emotionally overstressed patients. Under local anesthesia, the large peripheral vessels are punctured, access to the cardiac catheter is established, and 2 to 5 multi-electrode catheters are placed in different locations in the heart under X-ray fluoroscopy. The electrode catheters are connected to an electrophysiologist so that the waveforms of electrical impulses at different locations of the heart (intracardiac electrograms) can be visualized on the electrophysiologist monitor, and these electrodes, also called marker electrodes, are used for diagnosis. Once the location of the lesion is relatively clear, an ablation catheter is placed to further pinpoint the location of the lesion and perform ablation. The ablation procedure for atrial fibrillation differs from the conventional catheter ablation procedure in that most current ablations of atrial fibrillation require a three-dimensional scalar system to construct a three-dimensional model of the left atrium, which then guides the ablation of the appropriate site.