A junctional rhythm occurs when the electrical activation of the heart originates near or within the atrioventricular node, rather than from the sinoatrial node. Because the normal ventricular ...

But when the sinus node fails, there are backup pacemakers in the AV node (responsible for junctional rhythm) and ventricles that can take over if needed. These can also take over the heart rhythm ...

The rest of his exam is normal. A junctional rhythm occurs when the sinoatrial node (SA node) is not able to generate an action potential and the atrioventricular node (AV node) acts as the main ...

Note the gradual onset of the junctional mechanism as the sinus cycle length increases from 635-670 milliseconds while the ectopic rhythm usurps the sinus rhythm at a more rapid cycle length of ...