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Arrhythmias, also known as cardiac arrhythmias, are irregularities in the heartbeat, including when it is too fast or too slow. Essentially, this is anything but normal sinus rhythm. A resting heart rate that is too fast - above 100 beats per minute in adults - is called tachycardia, and a resting heart rate that is too slow - below 60 beats per minute - is called bradycardia.

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