In the emergency department, patients often come to the clinic with symptoms such as rapid heartbeat, shaking and panic. The first is hypoglycemia. Patients may have hypoglycemia because they have not eaten for a long time or have been given high-intensity training activities, or they have taken hypoglycemic drugs, and they may have sweating all over their body. Second, consider the emergence of arrhythmias, whether or not coronary heart disease, can appear arrhythmias, especially tachyarrhythmias. If you have such symptoms, check the random blood sugar to see if it is below 2.8 mmol/L and monitor the ECG to see if there is a tachyarrhythmia on the ECG. If tachyarrhythmia is present, the type of tachyarrhythmia should also be checked and treatment should be given from the root.