Junctional rhythm is a type of heart arrhythmia that occurs when the heart's natural pacemaker, the sinoatrial (SA) node, isn't functioning correctly. The SA node usually sends electrical signals that regulate the heartbeat. According to the provided reference, a junctional rhythm is a type of arrhythmia (irregular heartbeat).
Here's a breakdown:
- Arrhythmia: An irregular heartbeat, meaning the heart beats too fast, too slow, or with an irregular pattern.
- SA Node Malfunction: The sinoatrial (SA) node, the heart's primary pacemaker, isn't sending electrical signals properly.
- Junctional Focus: Instead of the SA node, another area in the heart, near the AV node (atrioventricular node) takes over pacing the heart. This "junctional focus" typically leads to a slower heart rate than normal.
In essence, junctional rhythm represents a situation where the heart's electrical system relies on a backup pacemaker due to the failure of the primary one.
