What is a characteristic feature of atrial flutter?

Atrial flutter is characterized by the presence of flutter waves, which are a result of re-entrant circuits in the atria. This arrhythmia typically manifests as a distinct rhythm observed on an electrocardiogram (ECG) where these flutter waves occur in a regular pattern. The re-entry circuit allows for a rapid and organized electrical activity within the atria, leading to the classic “sawtooth” pattern often described as "F-waves," particularly identifiable in leads II, III, and aVF of the ECG.

In contrast to irregular heart rhythms, atrial flutter often presents with a more regular rhythm, depending on the type (typical or atypical). While heart rates can vary, atrial flutter commonly occurs at rates that can exceed 100 beats per minute. The presence of observable P waves is generally absent in atrial flutter, which is another notable feature; instead, the flutter waves replace them. Therefore, the generation of these flutter waves due to re-entrant circuits is the hallmark characteristic of this condition.