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Atrial fibrillation & atrial flutter

Atrial fibrillation and atrial flutter are very fast electrical discharge patterns that make the atrial chamber of the heart contract extremely rapidly, thus causing the ventricles to contract faster and less efficiently than normal. In fibrillation, the atrial rhythm is irregular, so the ventricular rhythm is also irregular; in flutter, the atrial and ventricular rhythms usually are regular.

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