What is the rate range of a junctional escape rhythm?

What is the rate range of a junctional escape rhythm?

• A. 20-40 bpm
• B. 40-60 bpm
• C. 60-80 bpm
• D. 80-100 bpm

Answer: (B)

A junctional escape rhythm is characterized by a heart rate that typically falls between 40 and 60 beats per minute. This rhythm arises when the atrioventricular (AV) junction takes over the pacing of the heart in cases where the sinus node fails to generate an impulse or if there is a blockage at the level of the sinus node. The junctional escape rhythm reflects the heart's backup system kicking in to maintain a minimum level of cardiac output.

The heart rate in this rhythm is slower than normal sinus rhythm, which usually ranges between 60 and 100 beats per minute. The rate of 40-60 bpm ensures that the heart can still effectively pump blood even when the primary pacemaker, the sinoatrial (SA) node, is not functioning. This physiological response is crucial for sustaining circulation in situations of bradycardia or sinus node dysfunction.