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 ...

Abnormally slow heart rates result from breakdowns in two principal areas of the heart. First, the sinoatrial, or SA, node sets your “resting” heart rate, usually somewhere between 60 and 100 beats ...

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 ...

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 ...