Arrhythmia Index by MedicineNet.com

Arrhythmia (Irregular Heartbeat) Index

Featured: Arrhythmia Main Article

An arrhythmia is an abnormal heart rhythm. With an arrhythmia, the heartbeats may be irregular or too slow (bradycardia), to rapid (tachycardia), or too early. When a single heartbeat occurs earlier than normal, it is called a prmature contraction.

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