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Figure 6 Example activation map sequences over 400 ms during acute and chronic AF. Regions in gray indicate areas either not activated or a portion of the electrode array not in contact with atrial tissue. In the acute AF group, left atrial activation was dominated by repetitive activation originating from the deep posterior and medial atrium. Activation in the right free wall had two to four wavelets that would have a stable pattern for two to three cycles before changing. In the chronic AF group, activation maps showed more complex activation in the left atrium. The right atrium had three to five wavelets that would also have a stable pattern for two to three cycles before changing.