Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 7: Poster I
DY 7.20: Poster
Montag, 11. März 2013, 17:30–19:30, Poster C
Dependence of irregular excitation patterns on bridge width during interaction of pacemaker — •Yvonne Richter1, Claudia Lenk2 und Philipp Maaß1 — 1Fachbereich Physik, Universität Osnabrück, Germany — 2Institut für Chemie und Biotechnik, Technische Universität Ilmenau, Germany
Irregular excitation patterns in reaction-diffusion systems are often associated with a reduced performance of the system or pathological states like, e.g. fibrillation of the heart. Understanding the generation of such states is important for the improvement or therapy of these systems. The interaction of two pacemaker located in distinct regions which are only connected by a small bridge can on the one hand generate irregular excitation patterns and on the other hand return the system into a more regular state dependent on the frequency ratio of the two pacemaker. This mechanism is investigated by calculations of the Bueno-Orovio equations. We present a performance comparison of two different calculation methods, finite element method and finite differences method. Additionally, the ability to reduce the calculation time by application of graphic card computation (CUDA) is tested. With the best performing program the dependence of the excitation patterns resulting from the interaction of the two pacemaker on the width of the bridge is studied. The strength of the irregularity, measured by entropy and phase coherence, and changes in the shape of the excitation patterns as well as differences in the frequency ratios, determining the three different irregularity regimes, will be analysed. The results will be compared with the FitzHugh-Nagumo model.