Extended Data Table 1: Statistics of electrical and mechanical phase singularity dynamics on the surface of fibrillating, contracting hearts (n = 6)

From: Electromechanical vortex filaments during cardiac fibrillation

Table 1
  1. Measurements obtained by fluorescence imaging of the left ventricular surface of fibrillating, contracting pig (n = 3) and rabbit (n = 3) hearts. The fourth dataset (in the pig) was obtained in the same heart as the third heart, but in a different location (posterior instead of anterior left ventricular wall). Each data point corresponds to a recording, in which many hundreds of measurements were performed throughout the sequence of video images. The table shows similar numbers of electrical (V) and mechanical (M) phase singularities across hearts in the same species and similar ratios (M/V) across hearts and species, respectively. The measurements were obtained from several thousand video frames. In addition, the distances between electrical and mechanical (V–M) phase singularities are smaller than between equal (electrical–electrical or mechanical–mechanical) phase singularities across hearts and species, respectively. The data support the hypothesis that, on average, each electrical phase singularity can be associated with a nearby mechanical phase singularity. The average nearest neighbour distance between an electrical phase singularity and its corresponding mechanical phase singularity is small compared to or a fraction of the distance to the next electrical or mechanical phase singularity, respectively (in almost all cases the fraction is about 0.2).