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Discrete monophasic action potentials (MAPs) in human atrial fibrillation, during (A) episodic complex fractionated electrogram (CFAE) near right atrial appendage, (B) continuous CFAE near right pulmonary vein antra, and (C) no fractionation in the coronary sinus (CS78 in red and CS56) despite nearby fractionation in the coronary sinus and opposing endocardial surface (pentarray catheter). Spectral analysis of CS78 shows a narrow dominant frequency.
