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An arrhythmia is any disorder of a person's heart rate or rhythm. Their heart beats too quickly, too slowly or with an irregular pattern. When the heart beats faster than normal, it is called tachycardia. When the heart beats too slowly, it is called bradycardia.

Many factors can affect the heart's rhythm, such as having a heart attack, blood chemistry imbalances or abnormal hormone levels. Some substances or medicines may also cause arrhythmia.

Symptoms of arrhythmia include: