Cardiac electrophysiology is a procedure in which the electrophysiologic activity within the chambers of the heart is recorded by means of a recorder. Cardiac electrophysiology is an invasive test to assess the electrical function of the heart and is usually indicated in patients with symptoms of arrhythmia that cannot be definitively diagnosed by ECG or 24-hour ambulatory electrocardiogram. The advantage of this method is that it can accurately localize and treat arrhythmias. Generally, an electrode catheter is inserted by percutaneous puncture and placed at an appropriate location within the heart cavity, with a programmed stimulator and physiological recorder connected to the tail respectively, to record the electrophysiological activity within the heart cavity and make a comprehensive analysis and judgment. Cardiac electrophysiology is usually contraindicated in patients with infection, bleeding tendency or severe cardiac insufficiency. It is recommended that patients with palpitations (rapid heartbeat, often accompanied by panic) and other discomforts go to the hospital in time for examination and treatment under the guidance of specialized doctors.