The aortic valve is a septum in the body of mammals and birds that separates the ascending aorta and the descending aorta. It is an elastic stent, which in normal condition practically does not block the passage for blood. When diseases occur, problems arise with the passage of blood through this area, including serious ones such as mitral stenosis or congenital aortic valve defects. The causes of these problems can be various types of infections - rheumatism, syphilis, tuberculosis or aseptic subacute septic endocarditis. In such cases, the valve expands and contracts, leading to shortness of breath and other cardiovascular symptoms. Patients experience arrhythmias and heart failure, circulatory and pulse disorders, the appearance of a heart murmur, as well as a decrease in the effectiveness of antibiotics in the treatment of infectious diseases.