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Essay heading: A. Fib
 
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Issue: Science
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Date added: February 21, 1999
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No of pages / words: 17 / 4712
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As early as 1896 Englemann "proposed that AF could be the result of a single atrial focus activating the atria with a rapid rate."4 The typical depolarization rate of the atria is between 400 and 600 beats per minute.2 As a result of the rapid rate the atrial muscles fibrillate leading to an erratic baseline on ecg "without an identifiable P wave...
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Reentry "is not a disorder of impulse formation but rather a disorder of impulse propagation, it occurs when an impulse travels around an abnormal circuit repetitively."5 By performing several experiments on animals and humans, Allessie et al. "confirmed multiple wavelet reentry as the cause of AF by multipolar mapping...
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