What is a distinguishing feature of sinus bradycardia?

Sinus bradycardia is characterized by a heart rate that is less than 60 beats per minute. This reduction in heart rate is a key diagnostic feature. In a healthy sinus rhythm, the heart rate typically ranges from 60 to 100 bpm, so when it drops below this threshold, it indicates bradycardia.

The presence of normal P waves in sinus bradycardia signifies that the heart’s electrical impulses are originating from the sinus node, which remains intact. In contrast, other conditions such as atrial fibrillation or other arrhythmias may present with absent P waves or other abnormalities. Therefore, understanding the definition of bradycardia and recognizing the heart rate threshold is critical in identifying this particular rhythm disturbance.