S. PAEME 1, K. MOORHEAD 1, J.G. CHASE 2, C.E. HANN 2, B. LAMBERMONT 1, P. KOLH 1, M. MOONEN 1, P. LANCELLOTTI 1, P.C DAUBY 1, T. DESAIVE 1 1 Cardiovascular.

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Presentation transcript:

S. PAEME 1, K. MOORHEAD 1, J.G. CHASE 2, C.E. HANN 2, B. LAMBERMONT 1, P. KOLH 1, M. MOONEN 1, P. LANCELLOTTI 1, P.C DAUBY 1, T. DESAIVE 1 1 Cardiovascular Research Center, University of Liege, Belgium 2 Centre for Bio-Engineering, University of Canterbury, Christchurch, New Zealand This research uses a simple dynamic model of the stiffness of the valve leaflets to characterize their fundamental effects on flow and pressure. The valve is described as a non-linear rotational spring or a ‘hinge’ with the angle change under pressure driven flow being related to the stiffness and the damping of the valve. This model is included in a CVS model consisting of 7 elastic chambers [1]. Structural model of the mitral valve included in a cardiovascular closed loop model This study shows that this valvular model included in a CVS closed loop model gives physiological results. This proof-of-concept study demonstrates that this generic structural valve model could be used to investigate the hemodynamic repercussions of several pathological conditions, such as mitral regurgitation or stenosis. Results Methods Fig. 1 : Closed loop CVS model consisting of 7 elastic chambers. Fig. 2 : Mitral valve area evolution during one cardiac cycle Fig. 3 : Transmitral flow evolution Conclusions Acknowledgements References [1] Paeme, S. et al. Mathematical multi-scale model of the cardiovascular system including mitral valve dynamics. Application to ischemic mitral insufficiency. Biomed Eng Online, 10, 86, 2011 [2] Saito, S. et al. Mitral valve motion assessed by high-speed video camera in isolated swine heart. Eur J Cardiothorac Surg, 30, , 2006 [3] Flewitt, J.A. et al. Wave intensity analysis of left ventricular filling: application of windkessel theory. Am J Physiol Heart Circ Physiol, 292,6, , 2007 [4] Nelson, M.D. et al. Increased left ventricular twist, untwisting rates, and suction maintain global diastolic function during passive heart stress in human. Am J Physiol Heart Circ Physiol, 298, , 2010 This work was financially supported in part by the FNRS (FRIA PhD grant), the University of Canterbury, the French Community of Belgium (Actions de Recherches Concertées – Académie Wallonie-Europe). Figure 2 shows the evolution of mitral valve area during one cardiac cycle. The maximum mitral valve values reached during the E-wave and A-wave as well as timing of these two periods correspond to the physiological data [2,3]. Figure 3 shows the evolution of transmitral blood flow during one cardiac cycle with the E-wave amplitude nearly 1.5 times bigger than the A-wave amplitude as expected physiologically [3,4]. Introduction A minimal cardiovascular system (CVS) model including mitral valve dynamics has been previously validated in silico [1]. However parameters of this model are difficult to link with structural and anatomical components of the valve. This research describes the integration of a structural model of the mitral valve in an existing closed-loop cardiovascular system (CVS) model.