A healthy heart has an initial action impulse generated in the sinoatrial node and carried through the heart's upper chambers or atria. The impulse then moves down the internodal atrial pathways ...

There are several key areas that conduct electrical signals through the heart – the sinoatrial node, atrioventricular node, and bundle branches all work like players in an orchestra to keep a ...

Sick sinus syndrome (SSS) is a group of heart rhythm problems that occur when the heart's natural pacemaker—the sinoatrial ...

Ivabradine is a selective inhibitor of the I f ion channel found in cardiac pacemaker cells of the sinoatrial node. The drug reduces heart rate at rest and during exercise in patients in sinus ...