Keywords: echocardiography

    Ultrasound is a high vibration frequency sound waves, beyond the hearing range of the human ear. Ultrasound probe contact with human skin, it emits sound waves in the human body communication, and reflected from the tissue interfaces of the different densities, sound waves reflected back again the probe is received, the graphics enlarged after processing is displayed on the screen. The echocardiography examination method using ultrasonic cardiac structure and evaluate the state of cardiac function. Echocardiography Figure the involved coronary heart disease coronary vessels, cardiac muscle, cardiac structure and the vascular cardiac chambers hemodynamic state can provide qualitative and semi-quantitative or quantitative evaluation. The late 1980s and early 1990s, progress of interventional ultrasound improves the reliability and sensitivity of ultrasound diagnosis of coronary heart disease. Figure inspection methods used echocardiography: M-mode ultrasound, two-dimensional ultrasound, pulsed Doppler ultrasound and color Doppler ultrasound.