Abstract

The Markov model is used to study the effect of the vascular geometric model and the elastic blood vessel wall on the treatment and nursing care for patients with severe heart failure after coronary artery bypass grafting due to changes in hemodynamic characteristics. In accordance with the original CT data of the patients undergoing the coronary artery bypass grafting, the data are imported to the MMICS software to construct the Markov model for application after the coronary artery bypass grafting. Markov model is applied on the basis of the two modules, the ANSYS mechanical module and the CFX module. Through the special fluid structure coupling algorithm, the bidirectional coupling calculation of elastic blood vessel wall and blood can be implemented. Under the condition of a given pulse pressure, the distribution and deformation status of the wall shearing stress of the elastic tube and the rigid wall are simulated and compared. The results of the research showed that the maximum wall shearing stress and the displacement of the Markov model are higher than those of the CAD simplified model. In addition, the positions where the maximum displacement occurs in the two models are completely different. The maximum wall shearing stress and displacement in the application Markov model are lower than those in the application of the rigid vessel wall model. These results could provide a more reasonable data reference for the clinical diagnosis of coronary restenosis.