Atrial Flutter: ECG Findings Explained
Atrial flutter is a macroreentrent dysrhythmia characterized by rapid flutter waves with a sawtooth appearance. The ectopic atrial depolarizations are called flutter waves and are usually best visualized in the inferior leads. The absence of an isoelectric line between the atrial flutter waves results in a ”sawtooth” appearance. The flutter rate is typically between around 250 and 350 per minute. Although the atrial rate can be very fast, typically only a portion of impulses are conducted to the ventricles. Physiologic conduction delay at the AV node usually limits the AV conduction ratio to between 2:1 and 4:1. If the AV conduction ratio is constant, then the rhythm will be regular. Otherwise the R-R intervals will be unequal.
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