Figure 6.
  1. Multielectrode array covering the affected (noncolored) and nonaffected (blue) zones (postmortem staining by Evans blue dye);
  2. Photo of multielectrode array;
  3. Unipolar electrograms with AT, RT, and ARI measurements;
  4. Conduction velocity measurements across the normal and ischemic zones with representative electrograms recorded at sites a, b, and c corresponding to the normal, border and ischemic zones, respectively. “St” indicates a pacing artifact. Electrical step symbol indicates a pacing site. Arrow shows the direction of impulse propagation from normal to ischemic zone;
  5. Regularly spaced multielectrode array with interelectrode distance d. The boundary electrodes located on the edge of the array (white);
  6. Gradients of activation were computed using the finite difference technique along the dotted lines, in the horizontal and vertical directions, using the times at the four highlighted electrodes to calculate the conduction velocity vector for the center point.