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Sinus bradycardia can be the result of many things including good physical fitness, medications, and some forms of heart block. Sinus refers to the sinus node, the heart's natural pacemaker which creates the normal regular heartbeat.
When the heart is not pumping sufficient blood because of a slow heartbeat, it may fall into one of the categories of bradycardia. Sick sinus: Normally the electrical messages in the heart begin in a cluster of cells in the right atrium, called the sinus node (SA node). The sinus node is your heart's natural pacemaker. If it is malfunctioning, it can cause the heart to beat too slowly or to alternate between fast and slow beating.