Figure 2:

Activation map of AA2. A: Bipolar (BP) activation map. Note the broad and variable “early” zone on the lateral right atrial (RA) wall (left panel) and the later area on the septum that has a centripetal activation pattern (right panel). The brown disk is the radiofrequency (RF) lesion that changed this atrial arrhythmia to AA3. The yellow spheres indicate the His bundle. B: BP activation map after adjustment of the window. Note that the early activation generally matches the successful RF site. C: Omnipolar activation and vector map. Note a similar isochronal pattern to that of the BP map. The starred area highlights the “starburst” pattern of green vector areas all pointing away from the successful RF site. Inset shows the signal at the successful RF site (brown disk).