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Apparent inappropriate sinus tachycardia on ECG is more likely to be AFL with 2:1 block, the second flutter wave being hidden by the QRS.
The level of block of flutter waves at the AV node to the ventricles and the consistency of the block will determine the rate and regularity of the rhythm.
Atrial flutter waves, however, all have the same morphology, including the same height and width, and the rate is usually 250-350 flutter waves/minute.