The atria beat faster than the ventricles.Ītrial fibrillation often occurs in people with various types of heart disease. In atrial flutter, the heart beat is usually very fast but steady. When the atria fibrillate, blood that is not completely pumped out can pool and form a clot. The atrial muscles contract very quickly and irregularly the ventricles, the heart's two large lower chambers, beat irregularly but not as fast as the atria. In atrial fibrillation, the heart beat is completely irregular. The atria are the heart's two small upper chambers. Atrial fibrillation is responsible for about 15% of strokes. This can lead to a stroke or a blockage carried by the blood flow (an embolism ) anywhere in the body's arteries. Atrial flutter is less common, but both of these arrhythmias can cause a blood clot to form in the heart. It is the most common chronic arrhythmia. Nearly 2 million Americans have atrial fibrillation, according to the American Heart Association. DescriptionĪtrial fibrillation and flutter are two types of cardiac arrhythmias, irregularities in the heart's rhythm. In atrial flutter, the atria beat regularly and faster than the ventricles. In atrial fibrillation, the atria "quiver" chaotically and the ventricles beat irregularly. Atrial Fibrillation and Flutter DefinitionĪtrial fibrillation and flutter are abnormal heart rhythms in which the atria, or upper chambers of the heart, are out of sync with the ventricles, or lower chambers of the heart.
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