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On an ECG, Atrial Flutter resembles sawtooth like F waves. This is the result of an ectopic atrial pacemaker or because of a rapid reentry pathway somewhere within the atria, outside of the SA node area. The origin of this ectopic pacemaker is usually somewhere in the lower atrium and closer to the AV node thereby resulting in a distinct wave pattern. Heart disease or a heart abnormality is the usual cause of Atrial Flutter. Sometimes a cause is not found. The main problem with atrial flutter is that the heart does not pump blood well when the atria are beating too fast.