What defines junctional rhythm in terms of heart rate?

Junctional rhythm is characterized by a heart rate that typically falls within the range of 40 to 60 beats per minute (bpm). This rhythm originates from the atrioventricular (AV) junction rather than the sinoatrial (SA) node, which is the normal pacemaker of the heart. The AV junction takes over when there is either failure of the SA node to initiate impulses or a block in conduction pathways.

The heart rate in junctional rhythms usually reflects the intrinsic pacing rate of the AV junction, which is why it is classified between 40 and 60 bpm. This bradycardic rate is important in clinical practice as it can indicate underlying issues such as sick sinus syndrome or a block in the conduction system. Recognizing junctional rhythms and understanding their rate assists healthcare providers in determining appropriate diagnostic and therapeutic interventions.