Do you often feel palpitations, sudden and unexpected, but no abnormalities are found in the routine examination at the hospital? Do you feel chest tightness and weakness, dizziness and even blackness in front of your eyes, but an ECG at the hospital only reveals bradycardia? Do you have episodes of syncope and wake up in a few moments and return to normal soon after waking up? If you experience any of these discomforts, we recommend that you consider an “esophageal pacing” test. What is an “esophageal pacing” test? The full name of the test is “transesophageal cardiac electrophysiological examination”, which involves placing a 2.5mm diameter esophageal electrode through one nostril to the posterior wall of the left atrium to induce episodic arrhythmias through electrical stimulation, so as to clarify the pathogenesis and decide on a treatment plan. It is a non-invasive electrophysiological examination method to determine the treatment plan. This method has many advantages of being fast, non-invasive, convenient and inexpensive, and it is a commonly used basic cardiac electrophysiological examination method in clinical practice. It has important diagnostic value for paroxysmal supraventricular tachycardia and sick sinus syndrome. It should be clear that it is best to maintain a fasting state when performing this test, and it is not recommended for patients with serious esophageal disorders (e.g., esophageal varices, esophageal tumors, etc.) or patients with severely impaired cardiac function. The esophageal atrial stimulation electrophysiological examination mechanism is a new technique that emerged in the early 80s. Oesophageal atrial pacing electrophysiological examination is widely used in clinical practice and has become an indispensable item for the evaluation of certain specific arrhythmias, benefiting numerous patients with cardiovascular diseases and providing a scientific basis for diagnosis and treatment. The clinical applications of esophageal atrial pacing are as follows: i. Determination of sinus node function. For clinical patients with a heart rate of about 50 beats per minute, this method is used to determine the sinus node recovery time, sinus conduction time, and sinus node noncommittal period. Second, to determine the whole conduction system of the non-response period. The main measurement of the sinus node, atrium, atrioventricular node, sino-ventricular system and ventricular overdrive. Application in preexcitation syndrome. Determination of the parasternal nonstimulation, production of complete preexcitation graphs, diagnosis of occult preexcitation, and multiparasternal preexcitation. IV. Applications in paroxysmal supraventricular tachycardia. To study the pathogenesis, induction and termination of supraventricular tachycardia. V. Study and diagnosis of certain specific physiological phenomena. The common ones are occult conduction, supernormal conduction, atrioventricular node double channel, etc. Sixth, the application in drug research. It can be used to study and evaluate the effect of certain drugs on the cardiac conduction system and explain the mechanism of action of anti-arrhythmic drugs. VII. Rapid pacing for cardiac stress test, observation of angina pectoris and ECG changes after rapid pacing, diagnosis of coronary heart disease. As a temporary pacemaker, it is used for resuscitation of patients with third-degree atrioventricular block and patients in cardiac arrest. IX. Cooperate with surgical operations. For patients with slow heartbeat to be protected during surgery, so that the patient can pass the operation period smoothly. X. Temporary cardiac monitoring role.