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Fib / Flutter example two



This strip begins with a normal appearing sinus bradycardia, then breaks into fib/flutter.  The baseline looks enough like atrial flutter to deceive the viewer, but the R-R intervals are wrong.  These intervals all should be related to the F-F interval, and they are not.  They are, from the left, 0.59, 0.48, 0.52, 0.58, and so on, and these do not fit into a pattern.  They are irregularly irregular.