Influence of geometrical constraints on propagation in cardiac tissue

The behaviour of impulse propagation in the presence of non-excitable scar and boundaries is a complex phenomenon and induces pathological consequences in cardiac tissue. In this article, a geometrical configuration is considered so that cardiac waves propagate through a thin strand, which is connected to a large mass of cells. At this interface, waves can slow down or even be blocked depending on the width of the strand. We present an analytical approach leading to determine the blockage condition, by introducing planar travelling wavefront and circular stationary wave. Eventually, the influence of the tissue geometry is examined on the impulse propagation velocity