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An irregular heartbeat, or arrhythmia, can result from a change in the heart's standard electrical conduction system.
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Arrhythmia
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Please copy/paste the following text to properly cite this How Stuff Works article:
"Arrhythmia." 22 February 2005. HowStuffWorks.com. <http://health.howstuffworks.com/adam-200035.htm> 13 May 2008.
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