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An arrhythmia is a disorder of the heart rate or heart rhythm. This includes beating too fast (tachycardia), beating too slow (bradycardia), or beating irregularly.
Although most arrthymias are harmless, some can be serious and even life threatening. Arrthymias may cause the heart to not be able to pump enough blood to the rest of the body. If this occurs, there could be damage to the heart, brain, and other organs.
The heart is normally able to pump blood out to the body without working too hard. It has an electrical system that...