There is a difference between an electrocardiogram and a cardiac ultrasound. An electrocardiogram is the use of an electrocardiograph to record changes in the electrical activity of the heart during each cardiac cycle, while cardiac ultrasound is the use of ultrasound to visualize the specific structure of the heart. EKG and ultrasound are different methods of examining the heart, and there is a difference between the two. 1. Electrocardiogram (ECG) utilizes an electrocardiograph to record the electrical activity of the heart during each cardiac cycle, and reflects the situation through the conduction of electrical signals from the heart. ECG can diagnose various types of arrhythmias such as premature beats and acute myocardial infarction and myocardial ischemia, and is often used to evaluate the speed of the patient’s ventricular rate and the severity of myocardial ischemia. 2. Cardiac ultrasound is the application of ultrasound to observe the anatomical structure of the heart, which can be used to check the defects of the heart structure, and can also be used to measure the function of the heart. Cardiac ultrasound can be used to evaluate whether the size of each atrial chamber of the heart, the thickness of the ventricular wall, and the mobility of the ventricular wall are normal. Both ultrasound and EKG are important for patients with heart disease. If a patient is not feeling well, it is important that he or she undergoes the relevant tests immediately to determine the cause of the disease.