What is the typical rate of a junctional escape rhythm?

A junctional escape rhythm is a type of cardiac rhythm that occurs when the sinoatrial (SA) node fails to generate an impulse or when there is a block preventing impulses from reaching the atria. In this case, the atrioventricular (AV) junction takes over as the pacemaker of the heart. The intrinsic firing rate of the junction is between 40 and 60 beats per minute, which is why the correct answer is associated with this range.

Understanding this concept is essential, as it highlights the body's ability to maintain cardiac output even when higher centers of the conduction system fail. The lower rate compared to a normal sinus rhythm (which typically ranges from 60 to 100 beats per minute) reflects the junction's role as a backup pacemaker. Such knowledge is crucial for recognizing various cardiac rhythms and understanding their physiological implications in critical care settings.