Which statement is true regarding sinus tachycardia?

Sinus tachycardia is characterized by an elevated heart rate that typically exceeds 100 beats per minute. This condition occurs when the sinus node discharges signals at a faster rate in response to various stimuli such as exercise, excitement, or stress. A heart rate greater than 101 bpm accurately reflects sinus tachycardia, distinguishing it from other arrhythmias or normal sinus rhythm.

The defining feature of sinus tachycardia is that despite the increased heart rate, the underlying rhythm remains regular and originates from the sinus node. This means that while the heart rate is elevated, the atrial activity remains organized, and there is no chaos in the patterns of electrical activity in the atria. Therefore, the statement emphasizing a rate above 101 bpm aligns perfectly with the definition and characteristics of sinus tachycardia, making it the correct choice.

In contrast, other statements either incorrectly define heart rates or suggest chaos in atrial activity, which are not representative of sinus tachycardia.