An arrhythmia is a medical problem that deals with the rhythm of a person's heartbeat. When a person has an arrhythmia, the heart may beat too slow, too fast or at an irregular rhythm. For instance, tachycardia is when the heart beats too fast while bradycardia is when the heart beats too slow. A majority of irregular heartbeats are nothing to worry about, but some are more serious and might require immediate medical attention because they're life threatening.
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