Which characteristic is notable in Sinus Tachycardia?

In Sinus Tachycardia, a key characteristic is the presence of P waves that are identifiable and regularly precede the QRS complexes. This identifying feature indicates that the rhythm originates from the sinus node, where electrical impulses are generated in a consistent manner. The heart rate in Sinus Tachycardia is elevated, typically above 100 beats per minute, but the structure of the rhythm remains organized, as evidenced by these identifiable P waves.

This organization is important because it differentiates Sinus Tachycardia from other tachycardias, such as atrial fibrillation, where P waves are not discernible. The consistent pattern of P waves followed by QRS complexes signifies that although the heart rate is increased, the atrial activity and subsequent ventricular depolarization are still functioning normally within a sinus rhythm framework.