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Definition of Flutter

Flutter: Flutter is a rapid vibration or pulsation. The difference between flutter and fibrillation is that flutter is well organized while fibrillation is not.

For example, atrial flutter consists of well-organized but over-rapid contractions of the atrium of the heart (usually at a rate of 250-350 contractions per minute). Atrial flutter is a serious and potentially unstable cardiac rhythm.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=9738
Last Editorial Review: 6/14/2012

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