What is an arrhythmia?
An arrhythmia is a change in the rhythm of your heartbeat. When the heart beats too fast, it's called tachycardia. When it beats too slow, it's called bradycardia. An arrhythmia can also mean that your heart beats irregularly (skips a beat or has an extra beat).
Acute Management of Atrial Fibrillation: Part II. Prevention of Thromboembolic Complications by DE King, MD; LM Dickerson, PharmD; JL Sack, MD (American Family Physician July 15, 2002, http://www.aafp.org/afp/20020715/261.html)
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