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Figure 6 Fibrillation maps recorded from the free wall of the left atrium during control (left) and after four weeks of atrioventricular block (right). In dilated atria, fibrillation waves were less uniform and local crowding of isochrones occurred more frequently. Local conduction delays of >8 ms between neighboring electrodes are mapped in the lower panels. A higher degree of dissociation of fibrillation waves by lines of conduction delays was observed in dilated atria. LAA = left atrial appendage; PA = pulmonary artery.