How would a nurse classify a normal ECG with a rate of 110 beats/minute?

A normal ECG with a heart rate of 110 beats per minute can be classified as sinus tachycardia. Sinus tachycardia occurs when the heart rate exceeds 100 beats per minute but remains within a normal rhythm originating from the sinus node. The defining features include a regular rhythm, a P wave preceding each QRS complex, and a normal QRS duration, indicating that the electrical impulses are properly conducted through the heart.

In contrast, paroxysmal atrial tachycardia usually refers to episodes of rapid atrial rates that can start and stop abruptly, and while the rate may be similar, it is characterized by a different pattern on the ECG. Atrial flutter presents with a distinct "sawtooth" pattern of flutter waves instead of normal P waves and is typically associated with a more organized, yet abnormal atrial rate. Ventricular tachycardia reflects a higher heart rate originating from the ventricles, often lacking normal P waves and indicating a potentially life-threatening condition.

Thus, the classification as sinus tachycardia accurately reflects both the rhythm's origin and the heart rate, indicating a physiological response to factors like stress or exercise rather than a pathological arrhythmia.