Mapping Atrial Tachycardia (AT) and Atrial Flutter (AFl) Practice Test

The "sawtooth" pattern on an ECG, known as "F-waves," is a hallmark characteristic of Atrial Flutter (AFl). This pattern represents the rapid, regular atrial activity that occurs due to the presence of a reentrant circuit typically within the right atrium, although it can also occur in other areas. The F-waves are most prominently seen in the inferior leads, such as II, III, and aVF, with a distinctive appearance that looks like a series of tooth-like notches.

This feature is crucial in differentiating AFl from other types of arrhythmias. Unlike in Atrial Fibrillation, where there is chaotic atrial activity and no distinct waveforms, the regular nature of the F-waves in atrial flutter provides a clear visual cue for diagnosis. Recognizing this pattern allows clinicians to initiate appropriate management for patients experiencing this type of arrhythmia.