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Complex fractionated electrogram (CFAE) without distinct monophasic action potentials (MAPs) reflecting disorganization. A: Quasi-periodic disorganization (solid horizontal bars) in bipolar and MAP electrograms at the anterior left atrial septum, alternating with distinct activation in each. MAP alternans precedes the first and second CFAE episodes. B: Fluoroscopy. CL Broad spectral dominant frequency peak.
