Atrial flutter typically results in what type of baseline appearance on an ECG?

Atrial flutter is characterized by a distinctive ECG pattern primarily due to the rapid, organized electrical activity originating from the atria. This results in what is often described as a "saw-toothed" appearance on the ECG, specifically due to the presence of "F-waves" or flutter waves. These waves occur at a rate that is typically between 240 and 340 beats per minute, creating a regular and repeating pattern that resembles the teeth of a saw.

The saw-toothed pattern is most commonly visualized in the inferior leads (II, III, aVF) of the ECG, where the F-waves can be seen prominently. This characteristic pattern is a key diagnostic feature of atrial flutter and helps distinguish it from other arrhythmias. Understanding the specific waveform can assist healthcare professionals in making accurate diagnoses and deciding on appropriate treatment plans for patients experiencing this condition.