The ECG examination is not directly related to whether or not breakfast is eaten, and only requires the patient to remain quiet for the examination. Eating breakfast generally has no effect on the examination of ECG. ECG is mainly to check the patient’s heart function, such as whether the heart rhythm is normal, whether there is myocardial ischemia, whether there is cardiac electrophysiological disorders, etc. Normal breakfast will not affect the accuracy of the examination, so you can eat breakfast normally when you simply check the ECG. Electrocardiogram is a commonly used clinical examination, and patients suspected of coronary artery disease, arrhythmia, etc. are required to complete the electrocardiogram examination to find out whether there is myocardial ischemia and myocardial hypertrophy in the patient. When performing ECG examination, patients should ensure a quiet state and avoid excessive excitement and emotional anxiety, so as not to affect the results of ECG examination.