The ECG and the ultrasound cannot be compared because the two tests are not the same. The ECG mainly detects the electrical activity of the heart, while the ultrasound observes whether there are abnormalities in the structure, size and function of the heart. The ECG generally monitors the rhythm of the heart over a 24-hour period to observe the presence of arrhythmias and premature beats, and to determine the presence of myocardial ischemia and myocardial infarction through the changes in the ECG. Cardiac ultrasound mainly observes the structure, size and function of the heart. It can clarify the size of each atrial chamber in the heart, the thickness of the heart septum, the status of the valves, the movement of the heart and the ejection fraction of the heart, and can comprehensively judge the heart function and clarify whether there is organic heart disease. When patients have symptoms such as chest tightness and heart pain, they can first make a preliminary judgment through ambulatory ECG, and then continue to improve other related examinations according to the doctor’s suggestion to make a comprehensive judgment, and use conditioning and medication to help patients relieve symptoms as soon as possible to avoid causing serious cardiovascular diseases and affecting the prognosis.