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Isochronal maps of the LA of a patient with paroxysmal AF (ΔI = 50 ms). The maps show three successive focal sources from an origin, in the posterior LA mid-way between the pulmonary vein pairs and >2 cm from each pulmonary vein ostium, at the indicated times. Black corresponds to grid points that were not activated in any of the five preceding isochronal intervals. The white bar in (A) represents the interelectrode spacing.
