Transesophageal cardiac pacing is a non-invasive clinical electrophysiological diagnostic and therapeutic technique. It includes transesophageal atrial pacing and transesophageal ventricular pacing. The anatomical relationship between the esophagus and the heart is close, both being located in the mediastinum, with the heart in the front and the esophagus in the back, and the anterior wall of the esophagus is close to the posterior wall of the left atrium. Using this anatomical relationship, an esophageal pacing device can be used to indirectly stimulate the atria and ventricles via an electrical plate catheter placed in the esophagus, while recording the body surface ECG. This allows the measurement of electrophysiological parameters in various parts of the human heart, reveals the mechanism of arrhythmia, induces certain arrhythmias that are not easily observed, provides a precise basis for the analysis and diagnosis of certain patterns of the body surface ECG, and terminates It also provides a definitive basis for the analysis and diagnosis of certain electrocardiographic patterns on the body surface, and can terminate certain types of tachyarrhythmia. How is the esophageal pacing procedure performed? (1) The tip of the catheter is lubricated with paraffin oil and inserted through your nostrils. When it reaches the pharynx, you may breathe deeply to suppress the nausea reflex and swallow, allowing the catheter to enter the esophagus step by step. (2) The depth of catheter insertion is about 30-40 cm, depending on the individual, and the best depth is when one of the electrodes is close to the left atrium (generally, the reference depth is from your own earlobe to the base of the glabella). (3) Connect the electrode at the end of the catheter to the thoracic lead of the ECG machine and record the P-QRS-T wave group, when the P is positive and then negative in both directions and the amplitude is maximum, the QRS is QR type and the T wave is inverted, that is the ideal localization mark. (4) Withdraw the catheter from the ECG machine, connect it to the cardiac stimulator, and adjust the amplitude and frequency of the output pulse of the stimulator so that it can fully pace the heart. (5) The pacing program is set up to pace the heart according to the purpose of the test, and the ECG is continuously displayed or recorded for analysis to obtain diagnostic results.