Cavapulmonary anastomosis (A. cavopulmonary) is the connection of the lower and upper veins into one common vessel. This surgical intervention is not the main method of treating heart defects, but helps restore hemodynamics in the patient’s body. There are different ways to restore blood flow, which is why it is important to identify them all as early as possible. It is important to entrust the decision to professionals and experienced surgeons; - it is their well-coordinated work that helps reduce the risks of complications to zero thanks to an individual approach to each patient. The operation is performed using the same method as connecting the great vessels. The meaning of the surgical method is to enclose them in an anatomically uniform reservoir for the free flow and outflow of blood. Depending on the place of their connection, two types of anastomosis can be distinguished: - Small A. cavopulmonary - with this type of operation, the inferior veins are combined into a single vessel (venulenticavenal anastomosis). It is performed at the level of the IV segment of the descending branch of the diaphragm on the right. After the end of the operation, a natural expansion of the cavity of the pulmonary circulation occurs. In such conditions, the degree of ventilation of the lungs increases. - Large A. Cavopulmonary - used if previous methods are ineffective and also interfere with the natural process of closing the shunt. Its essence lies in the fact that it is carried out only in the second circle of blood circulation using more than three small vessels. It is very important to select the methods, methods and location according to all the rules, in order to prevent the patient’s condition from worsening in the early stages, and in the later stages to reduce the chances of relapses, complications and make life truly fulfilling for the little patient.