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Figure 1 Initiation of spontaneous atrial fibrillation (AF) on the Holter ambulatory electrocardiogram. (a) Spontaneous AF occurred at midnight. Premature atrial contraction was not observed before the occurrence of AF. (b) Initiation of paroxysmal AF. Paroxysmal atrial contraction occurred on the T-wave at the initiation of AF. Coarse fibrillatory waves succeeded and degenerated into fine and irregular f waves.
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