24-hour ambulatory electrocardiogram (ECG) can check the total number of heart beats of a patient in 24 hours, clarify whether the patient has sinus arrest, arrhythmia, myocardial ischemia, etc. in 24 hours, and at the same time, it can assess the sympathetic excitability according to the patient’s heart rate, the variability of the patient’s heart rate, and predict the risk of infarction-related prognosis, in short, 24-hour ambulatory electrocardiogram is more than just an upgraded version of the conventional electrocardiogram. When a patient presents with more obvious symptoms that are not captured by the shorter conventional ECG, the 24-hour ambulatory ECG can be further refined. When patients with arrhythmia or myocardial ischemia are treated, the 24-hour ECG can be worn after the administration of medication to observe the effect of treatment. Because 24-hour ECG is more expensive than conventional ECG, consult your local hospital and follow your doctor’s instructions. If there are symptoms such as discomfort in the precordial region, it is recommended to consult a doctor in time to avoid delaying the condition.