Heart ultrasound (echocardiography) is a diagnostic method that uses ultrasound waves for visualisation of the heart structures. Using this type of examination we can obtain significant data on the morphology and function of the heart muscle, heart valves, dimensions of the heart chambers and velocity of the blood flow through the heart and large blood vessels. The Colour-Doppler technique enables colour visualisation of the blood flow through the heart chambers and blood vessels, which makes th