What is sick sinus syndrome?

Sick sinus syndrome ? also known as sinus node disease or sinus node dysfunction ? is a group of heart rhythm problems (arrhythmias) in which the heart's natural pacemaker (sinus node) doesn't work properly. The sinus node is an area of specialized cells in the upper right chamber of the heart that controls the rhythm [...]
Source: News from Mayo Clinic - Category: Databases & Libraries Source Type: news