The 12-lead ECG is actually an ordinary ECG, which is relatively inexpensive and is currently the most widely used type of ECG in the clinic, with a price of about$40-60, and there may be some differences in each hospital area. . If a patient does not have any symptoms of discomfort when having a general ECG, but only occasionally has discomfort at a certain time of day, it is advisable to have an ambulatory ECG. It is relatively expensive, about 300 yuan, but if the patient is currently suspected of acute myocardial infarction or unstable angina, a general ECG can produce timely and effective results, and at the same time it can be compared when the patient is reexamined and clarify whether there is currently a dynamic evolution of the ECG.