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A. Repetitive Focal Beat during Paroxysmal AF (in low septal LA), with activation to remaining LA and fibrillatory conduction to the RA (CL≈100 ms). In contrast, B. Focal Atrial Tachycardia (non-fibrillatory) from the high posterior LA differs from AF by showing 1:1 activation centrifugally to the ipsilateral then contralateral atria (CL 300 ms).
