Echocardiography and cardiac ultrasound are actually the same test, but they are called differently. Cardiac ultrasound is the more common name and the one that is easier for patients to understand, while echocardiography is the expression of the book. Both are methods of examining the heart through 2D ultrasound, M-mode ultrasound, color Doppler, pulsed Doppler and continuous Doppler. In different hospitals it may be written differently on the application form, either echocardiography or cardiac ultrasound. Both echocardiography and cardiac ultrasound are methods to examine the morphology, structure, valve condition, blood flow and cardiac function of the heart. Whether it is congenital heart disease, cardiomyopathy, heart valve disease or coronary artery disease, etc., cardiac ultrasound can be performed. If a patient has symptoms such as palpitations, chest tightness or chest pain, or if the clinician hears a heart murmur, these conditions necessitate a cardiac ultrasound to rule out heart disease.