Аннтотация

© 2019 Author(s). The Fontan procedure is performed for univentricular correction of the heart in pediatric patients with tricuspid atresia. It brings a great contribution to the improvement of mortality in patients with a single ventricle. However, as a result of the procedure the load on the single functional ventricle of the heart and veins increases. Eventually, patients need a heart transplantation. As a possible solution to the circulation deficiencies of the Fontan patients can be the ventricular assist device (VAD). The VAD is implanted between veins and the pulmonary artery. In order to decrease the amount of in vitro tests, we use the electro-hydraulic analogy, where the cardiovascular system (CVS) is represented as an electrical circuit. It allows as tointroduce mathematical nonlinear models with lumped parameters of the Fontan univentricular circulation and its interaction with the VAD. Appling VAD to the Fontan patients brings possibility to increase the venous return of blood. According to the Frank-Starling law, the stroke volume increases with increasing venous return. VAD creates a necessary pressure differential between the venous and pulmonary sections of CVS. The interaction model of the Fontan circulation with VAD support demonstrates the normalization of the pressures and volumes distribution in the CVS. This indicates that the method studied in this work might be an ideal way to optimize the health condition of patients after Fontan procedure.