____ is a common ECG dysrhythmia affecting some two million Americans, a far greater percentage than any other dysrhythmia.

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Atrial fibrillation is the most common ECG dysrhythmia affecting two million Americans, which is a higher percentage than any other dysrhythmia. Septal fibrillation and localized fibrillation are not common dysrhythmias. Ventricular fibrillation is a life-threatening dysrhythmia but is less common than atrial fibrillation.

____ Is a Common ECG Dysrhythmia Affecting Some Two Million