Examining the structure and function of the heart by ultrasound is one of the latest and most promising study methods in cardiology. Echocardiography enables to follow cardiac function directly on the monitor of the sonograph: study the structure of valves and assess their function, measure the thickness and strength of contractions of the myocardium as well as the heart’s capacity for work, and ascertain the level of heart deficiency, symptoms of inflammation of myocardium and pericardium, etc. Echocardiography is not an intensive method; therefore, it is safe and not burdensome for patients. In the Viiking Health Rehabilitation Centre, the described survey is carried out with the help of a Siemens sonograph.