In atrial flutter, what is the typical range for the atrial rate?

In atrial flutter, the atrial rate is typically characterized by a high-frequency rhythmic pattern, usually ranging from 250 to 350 beats per minute. This rapid rate results in a distinct "sawtooth" pattern in the electrocardiogram, known as "F-waves" or flutter waves, which are particularly apparent in leads II, III, and aVF.

The high atrial rate in atrial flutter is a result of a reentrant circuit in the atria, causing the atria to contract rapidly and inefficiently. An atrial rate within this range signifies an abnormal electrical activity and can lead to decreased cardiac efficiency and potential complications like thrombus formation. Understanding this typical range is crucial for recognizing atrial flutter on an ECG and differentiating it from other forms of dysrhythmias.