Bekki-Nozaki hole in traveling excited waves on human cardiac interventricular septum

We observe some phase singularities in traveling excited waves noninvasively measured by a novel ultrasonic method, on a human cardiac interventricular septum (IVS) for a healthy young male. We present a possible physical model explaining a part of one-dimensional cardiac dynamics of the observed phase defects on the IVS. We show that at least one of the observed phase singularities in the excited waves on the IVS can be explained by the Bekki-Nozaki hole solution in the complex Ginzburg-Landau equation, although the creation and annihilation of phase singularities on the IVS give birth to a variety of complex patterns.