Figure 7. Snapshots of wave propagation at the posterior left atrial wall (PLAW) during transitions to fragmentation.
(sequence 1–6): purple, unactivated regions; white, advancing activation. A. Reentrant circuit with a clockwise propagation around a pivoting point located to the right edge of the septo-pulmonary bundle. B. Activation breakthrough across a line of slow conduction, with activation of the PLAW in both superior and inferior directions, and final convergence on the anterior aspect of the right superior pulmonary vein antrum.