What is the typical heart rate range for atrial tachycardia?

The typical heart rate range for atrial tachycardia is indeed between 140 and 250 beats per minute (bpm). Atrial tachycardia is characterized by an abnormally fast heart rhythm originating from the atria, the upper chambers of the heart. This increased rate occurs because of a reentrant circuit or ectopic foci within the atria that lead to rapid electrical impulses, causing the heart to beat faster than normal.

In contrast, the other ranges provided do not accurately reflect atrial tachycardia. A heart rate of 60-100 bpm represents a normal resting heart rate, while the range of 100-140 bpm is often associated with mild forms of tachycardia or other conditions, but does not reach the threshold typically seen in atrial tachycardia. Finally, a heart rate of 250-300 bpm is more characteristic of conditions such as atrial flutter or ventricular tachycardia, where the heart rate is significantly elevated beyond the typical atrial tachycardia range. Therefore, the correct identification of 140-250 bpm aligns with the clinical understanding of atrial tachycardia.