Detection of focal source and arrhythmogenic substrate from body surface potentials to guide atrial fibrillation ablation
Fig 4
Local activation time maps (a–c) and action potential duration maps (d–f) following a discharge of an FS (red stars) from the same site on the LA posterior wall (αLA = 0.4, βLA = 0.2), on the atrial mesh of Patient 1, under focal cycle lengths of 150 ms and 180 ms, with (“+”) and without (“−”) ACh.
The directions of wavefront propagation from the FS were shown by the black arrows. A gray color indicates tissue that was not excitable. Isochrone lines are drawn at an interval of 10ms. The focal activation was propagated at (a) and (c) but was blocked at (b). (f) shows the highest spatial heterogeneity in the action potential duration.