Echocardiography is the method of heart examination and diagnostics that is based on the registration of the ultrasound signals reflected from moving structures of the heart. The examination provides the physician with the opportunity to determine the anatomical structure of the heart, the dimensions of the ventricles and atria, the thickness of the walls of the heart, to evaluate the functional condition of heart valves, as well as to determine the presence of scars or thrombi after myocardial infarction. EchoCG can be used to determine the velocity and direction of blood flow in the heart and to determine deviations from the norm that are dangerous to the patient, but do not cause immediate complaints.