How often a 24-hour ambulatory ECG should be reviewed depends on the patient’s specific situation. In the case of patients with arrhythmias, the 24-hour ECG should be reviewed after at least one month while on medication. The status of the ECG is relevant to the evaluation of the efficacy of the medication and the next treatment plan, whether the dose of the antiarrhythmic medication needs to be adjusted, etc. Because 24-hour ambulatory ECG is easy to carry, it is possible to record the patient’s 24-hour ECG without significant restrictions on the patient’s usual daily activities. Arrhythmias or myocardial ischemia can be detected, and it is possible to find out whether symptoms such as panic or syncope are related to arrhythmias and whether daily activities are affected and can cause arrhythmias and myocardial ischemia. The patient’s condition during the day and night can also be known, and the 24-hour ECG can be used to evaluate the efficacy of medications, the efficacy of pacemakers and implanted defibrillators, whether there is any dysfunction, etc.