Figure 8. A: Pacing from the LAA showing the reversal of the activation sequence in the CS. The time of the counterclockwise rotation from the spike to the distal CS was 180 ms. The ablation catheter is located in the MI line and records double far-field potentials indicative of conduction block (blue arrows) and in between a high frequency near-field electrogram (green arrow) with total duration 50ms. The latter is possibly indicative of residual conduction through the MI ablation area, it does not have enough time to cross the MI and eventually fades colliding with the counterclockwise wavefront.B: Clockwise PMF with CL 240ms, that was diagnosed with high density activation mapping using the 3D mapping system.