What defines sinus bradycardia?

Sinus bradycardia is characterized by a slower than normal heart rate while still maintaining the normal function of the sinoatrial (SA) node as the primary pacemaker. In this condition, the SA node generates electrical impulses, but these impulses occur at a rate that is slower than the typical range of 60 to 100 beats per minute. This means that while the SA node is operational and retains its role in pacemaking, the discharge rate is insufficient to maintain a normal heart rate. Thus, the correct identification of sinus bradycardia is through the recognition that the SA node is functioning but discharging impulses at a slower rhythm.