A junctional rhythm is an arrhythmia in which the impulse of the heartbeat originates from the atrioventricular junctional zone instead of the normal sinus node, and the resulting rhythm is called a junctional rhythm. Junctional rhythm is a physiologically protected rhythm to prevent ventricular arrest. For example, when the sinus node is working, the frequency of impulses slows down or conduction is impaired, so that the impulses from the sinus node cannot be transmitted downward, and then the atrioventricular junctional zone may become the dominant pacing point and a junctional rhythm occurs. If the sinus node function is restored or conduction is restored, the junctional rhythm will return to sinus rhythm, so junctional rhythm often does not require special treatment.