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Sick sinus syndrome is a group of common heart disorders that can influence how the heart beats. The sino-atrial node, which is a cluster of specialized cells in the heart that functions as a natural pacemaker, is referred to as a natural pacemaker in the sino-atrial node. Electric impulses that start each heartbeat are generated by the SA node. These signals change from the SA node to the remainder of the heart, indicating the heart muscle's signaling to contraction and pump blood. The SA node does not work properly in people with sick sinus syndrome. Sick sinus syndrome tends to cause the heartbeat to be too slow, but not always the heartbeat is too fast. As signs of sick sinus syndrome first appear, they usually get worse as time goes. However, some people with the disorder have no reported health problems. Sick sinus disease most commonly occurs in older adults, but it can be diagnosed in people of any age.
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